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Thread: This is a link to full executable jar file.

  1. June 15th, 2012, 10:09 AM #1
    rajeshverma
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    Default This is a link to full executable jar file.

    Link: MobileChess-TouchScreen(1).jar

    In evaluate class,what is represented by distance?
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  3. June 15th, 2012, 10:53 AM #2
    copeg
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    Default Re: This is a link to full executable jar file.

    Thread moved to Java Theory & Questions

    I honestly don't even know what you are asking...and I can only speak for myself, but am not going to download an executable jar from an unknown source
    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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  4. June 15th, 2012, 10:53 AM #3
    copeg
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    Default Re: This is a link to full executable jar file.

    This thread has been cross posted here:

    http://www.java-forums.org/new-java/60716-evaluation-class-decompiled-chess-progamme-help-me-understand.html

    Although cross posting is allowed, for everyone's benefit, please read:

    Java Programming Forums Cross Posting Rules

    The Problems With Cross Posting

    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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  5. June 15th, 2012, 11:07 AM #4
    Norm
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    Default Re: This is a link to full executable jar file.

    Post the code here that you have questions about.
    If you don't understand my answer, don't ignore it, ask a question.
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  6. June 15th, 2012, 11:12 AM #5
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    trusted suceforge link :Mobile Chess and Flash Chess | Free Games software downloads at SourceForge.net
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  7. June 15th, 2012, 11:14 AM #6
    Norm
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    Default Re: This is a link to full executable jar file.

    Copy and paste here the code you have questions about. Be sure to wrap the code with[code=java]<YOUR CODE HERE>[/code] to get highlighting
    If you don't understand my answer, don't ignore it, ask a question.
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  8. June 15th, 2012, 11:15 AM #7
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    part of code (full code on link):


    package chess;
 
 
// Referenced classes of package chess:
//            Position, Util
 
public class Evaluate
{
 
    public static final int PIECE_KING = 0;
    public static final int PIECE_QUEEN = 1;
    public static final int PIECE_ROOK = 2;
    public static final int PIECE_BISHOP = 3;
    public static final int PIECE_KNIGHT = 4;
    public static final int PIECE_PAWN = 5;
    public static final int FULL_BIT_RANK = 4080;
    public static final int LAZY_MARGIN = 100;
    public static final int ISOLATED_PENALTY = 10;
    public static final int DOUBLE_PENALTY = 4;
    public static final int PIECE_VALUE[] = {
        0, 9, 5, 3, 3, 1
    };
    public static final int PASS_PAWN[] = {
        0, 35, 30, 20, 10, 5, 0, 0
    };
    public static final byte DISTANCE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 
        6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 
        0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 
        2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 
        5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 
        2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 
        6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0
    };
    Last edited by rajeshverma; June 15th, 2012 at 11:21 AM.
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  9. June 15th, 2012, 11:17 AM #8
    Norm
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    Default Re: This is a link to full executable jar file.

    What is you question about the code?

    Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting
    If you don't understand my answer, don't ignore it, ask a question.
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  10. June 15th, 2012, 11:23 AM #9
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    Question is : what is represented by 'distance' in code ?
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  11. June 15th, 2012, 11:25 AM #10
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    This code is a part of mobile chess jar file downloaded from : Mobile Chess and Flash Chess | Free Games software downloads at SourceForge.net
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  12. June 15th, 2012, 11:32 AM #11
    Norm
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    Default Re: This is a link to full executable jar file.

    It looks like an array of byte values. How does the code use the contents of the array? You will have to read the code and see how it is used. Perhaps the author's comments will explain what it is used for.
    How many elements are there in the array? Does that number correspond with any other features of the program?
    If you don't understand my answer, don't ignore it, ask a question.
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  13. June 15th, 2012, 12:13 PM #12
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    Yes sir,it is an array of byte values. Second thing, I don't know author. Now as far as correspondence with any other features is concerned, I guess it has something to do with chessboard.

    Other detail: (1)I have downloaded this from : Mobile Chess and Flash Chess | Free Games software downloads at SourceForge.net .
    (2)I have decompiled the jar.
    (3)Now I post full code under.
    (4)The code is for 'evaluating' position on board.
    (5)Other things about code ,I feel, it uses alpha-beta for analysis,squares have different values in all functions
    package chess;
 
 
// Referenced classes of package chess:
//            Position, Util
 
public class Evaluate
{
 
    public static final int PIECE_KING = 0;
    public static final int PIECE_QUEEN = 1;
    public static final int PIECE_ROOK = 2;
    public static final int PIECE_BISHOP = 3;
    public static final int PIECE_KNIGHT = 4;
    public static final int PIECE_PAWN = 5;
    public static final int FULL_BIT_RANK = 4080;
    public static final int LAZY_MARGIN = 100;
    public static final int ISOLATED_PENALTY = 10;
    public static final int DOUBLE_PENALTY = 4;
    public static final int PIECE_VALUE[] = {
        0, 9, 5, 3, 3, 1
    };
    public static final int PASS_PAWN[] = {
        0, 35, 30, 20, 10, 5, 0, 0
    };
    public static final byte DISTANCE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 
        6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 
        0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 
        2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 
        5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 
        2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 
        6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0
    };
    public static final byte ENDGAME_EDGE[] = {
        0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 
        1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 
        0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 
        0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 
        0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 
        0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 
        0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 
        0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 
        1, 1, 1, 1, 0, 0, 0, 0
    };
    public static final byte ENDGAME_BOTTOM[] = {
        0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 
        1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 
        1, 1, 1, 1, 0, 0, 0, 0
    };
    public static final byte ENDGAME_KING_PENALTY[] = {
        0, 0, 0, 0, 25, 22, 19, 16, 16, 19, 
        22, 25, 0, 0, 0, 0, 0, 0, 0, 0, 
        17, 14, 11, 8, 8, 11, 14, 17, 0, 0, 
        0, 0, 0, 0, 0, 0, 13, 10, 7, 4, 
        4, 7, 10, 13, 0, 0, 0, 0, 0, 0, 
        0, 0, 9, 6, 3, 0, 0, 3, 6, 9, 
        0, 0, 0, 0, 0, 0, 0, 0, 9, 6, 
        3, 0, 0, 3, 6, 9, 0, 0, 0, 0, 
        0, 0, 0, 0, 13, 10, 7, 4, 4, 7, 
        10, 13, 0, 0, 0, 0, 0, 0, 0, 0, 
        17, 14, 11, 8, 8, 11, 14, 17, 0, 0, 
        0, 0, 0, 0, 0, 0, 25, 22, 19, 16, 
        16, 19, 22, 25, 0, 0, 0, 0
    };
    public static final byte EDGE_PENALTY[] = {
        0, 0, 0, 0, 6, 5, 4, 3, 3, 4, 
        5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 
        5, 4, 3, 2, 2, 3, 4, 5, 0, 0, 
        0, 0, 0, 0, 0, 0, 4, 3, 2, 1, 
        1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 
        0, 0, 3, 2, 1, 0, 0, 1, 2, 3, 
        0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 
        1, 0, 0, 1, 2, 3, 0, 0, 0, 0, 
        0, 0, 0, 0, 4, 3, 2, 1, 1, 2, 
        3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 
        5, 4, 3, 2, 2, 3, 4, 5, 0, 0, 
        0, 0, 0, 0, 0, 0, 6, 5, 4, 3, 
        3, 4, 5, 6, 0, 0, 0, 0
    };
    public static final byte PAWN_VALUE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        30, 30, 46, 70, 78, 46, 30, 30, 0, 0, 
        0, 0, 0, 0, 0, 0, 8, 8, 22, 43, 
        50, 22, 8, 8, 0, 0, 0, 0, 0, 0, 
        0, 0, 4, 4, 16, 34, 40, 16, 4, 4, 
        0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 
        12, 27, 32, 12, 2, 2, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 8, 20, 24, 8, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 6, 15, 18, 6, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
    public static final byte CENTER_IMPORTANCE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 2, 5, 
        5, 2, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 5, 8, 8, 5, 2, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
        5, 8, 8, 5, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 2, 5, 5, 2, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
    public static final byte RANK_IMPORTANCE[] = {
        0, 0, 0, 0, 12, 12, 12, 12, 12, 12, 
        12, 12, 0, 0, 0, 0, 0, 0, 0, 0, 
        12, 12, 12, 12, 12, 12, 12, 12, 0, 0, 
        0, 0, 0, 0, 0, 0, 6, 6, 6, 6, 
        6, 6, 6, 6, 0, 0, 0, 0, 0, 0, 
        0, 0, 3, 3, 3, 3, 3, 3, 3, 3, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
 
    public Evaluate()
    {
    }
 
    public static boolean IN_BOARD(int sq)
    {
        return Position.IN_BOARD(sq);
    }
 
    public static int SQUARE_FLIP(int sq)
    {
        return Position.SQUARE_FLIP(sq);
    }
 
    public static int losingKingValue(int sq)
    {
        return -ENDGAME_KING_PENALTY[sq] * 2 - ENDGAME_BOTTOM[sq] * 8;
    }
 
    public static int winningKingValue(int sq, int sqOppKing)
    {
        return -DISTANCE[(sqOppKing - sq) + 128] * 2 - ENDGAME_EDGE[sq] * 8;
    }
 
    public static int calcRookControl(Position pos, int sqSrc, short attack[])
    {
        return calcSlideControl(pos, sqSrc, attack, true);
    }
 
    public static int calcBishopControl(Position pos, int sqSrc, short attack[])
    {
        return calcSlideControl(pos, sqSrc, attack, false);
    }
 
    public static int calcSlideControl(Position pos, int sqSrc, short attack[], boolean isRook)
    {
        int control = 0;
        for(int i = 0; i < 4; i++)
        {
            int delta = isRook ? Position.ROOK_DELTA[i] : Position.BISHOP_DELTA[i];
            int sqDst = sqSrc + delta;
            boolean direct = true;
            for(; IN_BOARD(sqDst); sqDst += delta)
            {
                control += direct ? ((int) (attack[sqDst])) : attack[sqDst] / 2;
                if(pos.squares[sqDst] <= 0)
                {
                    continue;
                }
                int pieceType = Position.PIECE_TYPE(pos.squares[sqDst]);
                if(pieceType == 5)
                {
                    break;
                }
                if(pieceType == 0 || pieceType == 4 || pieceType == (isRook ? 3 : 2))
                {
                    direct = false;
                }
            }
 
        }
 
        return control;
    }
 
    public static void preEval(Position pos)
    {
        int vlWhite = 0;
        int vlBlack = 0;
        int sqWhiteKing = 0;
        int sqBlackKing = 0;
        for(int sq = 0; sq < 128; sq++)
        {
            int pc = pos.squares[sq];
            if(pc != 0)
            {
                if(pc < 16)
                {
                    vlWhite += PIECE_VALUE[pc - 8];
                    if(pc == 8)
                    {
                        sqWhiteKing = sq;
                    }
                } else
                {
                    vlBlack += PIECE_VALUE[pc - 16];
                    if(pc == 16)
                    {
                        sqBlackKing = sq;
                    }
                }
            }
        }
 
        boolean inEndgame = Math.min(vlWhite, vlBlack) <= 6 && Math.abs(vlWhite - vlBlack) >= 2;
        short whiteAttack[] = new short[128];
        short blackAttack[] = new short[128];
        for(int sq = 0; sq < 128; sq++)
        {
            whiteAttack[sq] = blackAttack[SQUARE_FLIP(sq)] = (short)((RANK_IMPORTANCE[sq] * Math.max((vlWhite + vlBlack) - 24, 8)) / 32 + CENTER_IMPORTANCE[sq]);
        }
 
        for(int i = 0; i < 8; i++)
        {
            int importance = (12 * Math.max((vlWhite + vlBlack) - 24, 8)) / 32;
            int sq = sqWhiteKing + Position.KING_DELTA[i];
            if(IN_BOARD(sq))
            {
                blackAttack[sq] += importance;
            }
            sq = sqBlackKing + Position.KING_DELTA[i];
            if(IN_BOARD(sq))
            {
                whiteAttack[sq] += importance;
            }
        }
 
        short whiteRookControl[] = new short[128];
        short whiteBishopControl[] = new short[128];
        short blackRookControl[] = new short[128];
        short blackBishopControl[] = new short[128];
        for(int sq = 0; sq < 128; sq++)
        {
            if(IN_BOARD(sq))
            {
                whiteRookControl[sq] = (short)calcRookControl(pos, sq, whiteAttack);
                blackRookControl[sq] = (short)calcRookControl(pos, sq, blackAttack);
                whiteBishopControl[sq] = (short)calcBishopControl(pos, sq, whiteAttack);
                blackBishopControl[sq] = (short)calcBishopControl(pos, sq, blackAttack);
            }
        }
 
        for(int sq = 0; sq < 128; sq++)
        {
            if(IN_BOARD(sq))
            {
                int edgePenalty = EDGE_PENALTY[sq];
                if(inEndgame)
                {
                    if(vlWhite < vlBlack)
                    {
                        pos.vlWhitePiecePos[0][sq] = (short)losingKingValue(sq);
                        pos.vlBlackPiecePos[0][sq] = (short)winningKingValue(sq, sqWhiteKing);
                    } else
                    {
                        pos.vlBlackPiecePos[0][sq] = (short)losingKingValue(sq);
                        pos.vlWhitePiecePos[0][sq] = (short)winningKingValue(sq, sqBlackKing);
                    }
                    for(int i = 1; i <= 4; i++)
                    {
                        pos.vlWhitePiecePos[i][sq] = pos.vlBlackPiecePos[i][sq] = (short)(PIECE_VALUE[i] * 100);
                    }
 
                } else
                {
                    if(vlWhite + vlBlack <= 32)
                    {
                        pos.vlWhitePiecePos[0][sq] = pos.vlBlackPiecePos[0][sq] = (short)(-edgePenalty);
                    } else
                    {
                        pos.vlWhitePiecePos[0][sq] = pos.vlBlackPiecePos[0][sq] = 0;
                    }
                    pos.vlWhitePiecePos[1][sq] = (short)(PIECE_VALUE[1] * 100 + (whiteRookControl[sq] + whiteBishopControl[sq]) / 8);
                    pos.vlBlackPiecePos[1][sq] = (short)(PIECE_VALUE[1] * 100 + (blackRookControl[sq] + blackBishopControl[sq]) / 8);
                    pos.vlWhitePiecePos[2][sq] = (short)(PIECE_VALUE[2] * 100 + whiteRookControl[sq] / 2);
                    pos.vlBlackPiecePos[2][sq] = (short)(PIECE_VALUE[2] * 100 + blackRookControl[sq] / 2);
                    pos.vlWhitePiecePos[3][sq] = (short)(PIECE_VALUE[3] * 100 + whiteBishopControl[sq] / 2);
                    pos.vlBlackPiecePos[3][sq] = (short)(PIECE_VALUE[3] * 100 + blackBishopControl[sq] / 2);
                    int whiteKnightAttack = 0;
                    int blackKnightAttack = 0;
                    for(int i = 0; i < 8; i++)
                    {
                        int sqDst = sq + Position.KNIGHT_DELTA[i];
                        if(IN_BOARD(sqDst))
                        {
                            whiteKnightAttack += whiteAttack[sqDst];
                            blackKnightAttack += blackAttack[sqDst];
                        }
                    }
 
                    pos.vlWhitePiecePos[4][sq] = (short)((PIECE_VALUE[4] * 100 + whiteKnightAttack / 4) - (edgePenalty * 3) / 2);
                    pos.vlBlackPiecePos[4][sq] = (short)((PIECE_VALUE[4] * 100 + blackKnightAttack / 4) - (edgePenalty * 3) / 2);
                }
                pos.vlWhitePiecePos[5][sq] = pos.vlBlackPiecePos[5][SQUARE_FLIP(sq)] = (short)((PIECE_VALUE[5] * 100 + PAWN_VALUE[sq] / 2) - 6);
            }
        }
 
        for(int sd = 0; sd < 2; sd++)
        {
            int brSelf = 0;
            int brSide = 0;
            int brBehindOppPass = 0;
            int brOppPass = 4080;
            for(int i = 1; i <= 6; i++)
            {
                int y = sd != 0 ? i : 7 - i;
                int brOpp = sd != 0 ? pos.brWhitePawn[y] : pos.brBlackPawn[y];
                brOppPass &= ~(brSelf | brSide);
                brBehindOppPass |= brOppPass & brOpp;
                int brChain = brSide;
                brSelf = sd != 0 ? pos.brBlackPawn[y] : pos.brWhitePawn[y];
                brSide = (brSelf >> 1 | brSelf << 1) & 0xff0;
                int brForward = sd != 0 ? pos.brBlackPawn[y + 1] : pos.brWhitePawn[y + 1];
                int brLeftCover = brForward >> 1 & 0xff0;
                int brRightCover = brForward << 1 & 0xff0;
                for(int x = 4; x <= 11; x++)
                {
                    int sq = Position.COORD_XY(x, y);
                    int brSquare = 1 << x;
                    int value = ((brSide & brSquare) == 0 ? 0 : 3) + ((brChain & brSquare) == 0 ? 0 : 2);
                    value += ((brLeftCover & brSquare) == 0 ? 0 : 2) + ((brRightCover & brSquare) == 0 ? 0 : 2);
                    value += (brSelf & brSquare) == 0 ? 0 : 1;
                    if(sd == 0)
                    {
                        pos.vlWhitePiecePos[5][sq] += value;
                    } else
                    {
                        pos.vlBlackPiecePos[5][sq] += value;
                    }
                    if(vlWhite + vlBlack <= 32)
                    {
                        if((brOppPass & brSquare) != 0)
                        {
                            if(sd == 0)
                            {
                                pos.vlBlackPiecePos[5][sq] += PASS_PAWN[i];
                            } else
                            {
                                pos.vlWhitePiecePos[5][sq] += PASS_PAWN[i];
                            }
                        }
                        if((brBehindOppPass & brSquare) != 0)
                        {
                            pos.vlWhitePiecePos[2][sq] += 8;
                            pos.vlBlackPiecePos[2][sq] += 8;
                            if(i == 6)
                            {
                                int sqBottom = sq + Position.FORWARD_DELTA(sd);
                                pos.vlWhitePiecePos[2][sqBottom] += 8;
                                pos.vlBlackPiecePos[2][sqBottom] += 8;
                            }
                        }
                    }
                }
 
            }
 
        }
 
        for(int sq = 103; sq <= 104; sq++)
        {
            if(pos.squares[sq] == 13)
            {
                pos.vlWhitePiecePos[3][sq - 16] -= 10;
            }
        }
 
        for(int sq = 23; sq <= 24; sq++)
        {
            if(pos.squares[sq] == 21)
            {
                pos.vlBlackPiecePos[3][sq + 16] -= 10;
            }
        }
 
        pos.vlWhite = pos.vlBlack = 0;
        for(int sq = 0; sq < 128; sq++)
        {
            int pc = pos.squares[sq];
            if(pc > 0)
            {
                if(pc < 16)
                {
                    pos.vlWhite += pos.vlWhitePiecePos[pc - 8][sq];
                } else
                {
                    pos.vlBlack += pos.vlBlackPiecePos[pc - 16][sq];
                }
            }
        }
 
    }
 
    public static int evaluate(Position pos, int vlAlpha, int vlBeta)
    {
        int vl = pos.material();
        if(vl + 100 <= vlAlpha)
        {
            return vl + 100;
        }
        if(vl - 100 >= vlBeta)
        {
            return vl - 100;
        }
        for(int sd = 0; sd < 2; sd++)
        {
            int brSingle = 0;
            int brDouble = 0;
            int brs[] = sd != 0 ? pos.brBlackPawn : pos.brWhitePawn;
            for(int i = 1; i <= 6; i++)
            {
                brDouble |= brSingle & brs[i];
                brSingle |= brs[i];
            }
 
            int brIsolated = brSingle & ~(brSingle << 1 | brSingle >> 1);
            int penalty = Util.POP_COUNT_16(brDouble) * 4 + Util.POP_COUNT_16(brIsolated) * 10 + Util.POP_COUNT_16(brIsolated & brDouble) * 10 * 2;
            vl += pos.sdPlayer != sd ? penalty : -penalty;
        }
 
        return vl;
    }
 
}
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  14. June 15th, 2012, 12:13 PM #13
    rajeshverma
    rajeshverma is offline
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    Default Re: This is a link to full executable jar file.

    Yes sir,it is an array of byte values. Second thing, I don't know author. Now as far as correspondence with any other features is concerned, I guess it has something to do with chessboard.

    Other detail: (1)I have downloaded this from : Mobile Chess and Flash Chess | Free Games software downloads at SourceForge.net .
    (2)I have decompiled the jar.
    (3)Now I post full code under.
    (4)The code is for 'evaluating' position on board.
    (5)Other things about code ,I feel, it uses alpha-beta for analysis,squares have different values in all functions
    package chess;
 
 
// Referenced classes of package chess:
//            Position, Util
 
public class Evaluate
{
 
    public static final int PIECE_KING = 0;
    public static final int PIECE_QUEEN = 1;
    public static final int PIECE_ROOK = 2;
    public static final int PIECE_BISHOP = 3;
    public static final int PIECE_KNIGHT = 4;
    public static final int PIECE_PAWN = 5;
    public static final int FULL_BIT_RANK = 4080;
    public static final int LAZY_MARGIN = 100;
    public static final int ISOLATED_PENALTY = 10;
    public static final int DOUBLE_PENALTY = 4;
    public static final int PIECE_VALUE[] = {
        0, 9, 5, 3, 3, 1
    };
    public static final int PASS_PAWN[] = {
        0, 35, 30, 20, 10, 5, 0, 0
    };
    public static final byte DISTANCE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 
        0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 
        6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 
        3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 
        0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 
        2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 
        5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 
        2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 
        6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0
    };
    public static final byte ENDGAME_EDGE[] = {
        0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 
        1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 
        0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 
        0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 
        0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 
        0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 
        0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 
        0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 
        1, 1, 1, 1, 0, 0, 0, 0
    };
    public static final byte ENDGAME_BOTTOM[] = {
        0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 
        1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 
        1, 1, 1, 1, 0, 0, 0, 0
    };
    public static final byte ENDGAME_KING_PENALTY[] = {
        0, 0, 0, 0, 25, 22, 19, 16, 16, 19, 
        22, 25, 0, 0, 0, 0, 0, 0, 0, 0, 
        17, 14, 11, 8, 8, 11, 14, 17, 0, 0, 
        0, 0, 0, 0, 0, 0, 13, 10, 7, 4, 
        4, 7, 10, 13, 0, 0, 0, 0, 0, 0, 
        0, 0, 9, 6, 3, 0, 0, 3, 6, 9, 
        0, 0, 0, 0, 0, 0, 0, 0, 9, 6, 
        3, 0, 0, 3, 6, 9, 0, 0, 0, 0, 
        0, 0, 0, 0, 13, 10, 7, 4, 4, 7, 
        10, 13, 0, 0, 0, 0, 0, 0, 0, 0, 
        17, 14, 11, 8, 8, 11, 14, 17, 0, 0, 
        0, 0, 0, 0, 0, 0, 25, 22, 19, 16, 
        16, 19, 22, 25, 0, 0, 0, 0
    };
    public static final byte EDGE_PENALTY[] = {
        0, 0, 0, 0, 6, 5, 4, 3, 3, 4, 
        5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 
        5, 4, 3, 2, 2, 3, 4, 5, 0, 0, 
        0, 0, 0, 0, 0, 0, 4, 3, 2, 1, 
        1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 
        0, 0, 3, 2, 1, 0, 0, 1, 2, 3, 
        0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 
        1, 0, 0, 1, 2, 3, 0, 0, 0, 0, 
        0, 0, 0, 0, 4, 3, 2, 1, 1, 2, 
        3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 
        5, 4, 3, 2, 2, 3, 4, 5, 0, 0, 
        0, 0, 0, 0, 0, 0, 6, 5, 4, 3, 
        3, 4, 5, 6, 0, 0, 0, 0
    };
    public static final byte PAWN_VALUE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        30, 30, 46, 70, 78, 46, 30, 30, 0, 0, 
        0, 0, 0, 0, 0, 0, 8, 8, 22, 43, 
        50, 22, 8, 8, 0, 0, 0, 0, 0, 0, 
        0, 0, 4, 4, 16, 34, 40, 16, 4, 4, 
        0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 
        12, 27, 32, 12, 2, 2, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 8, 20, 24, 8, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 6, 15, 18, 6, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
    public static final byte CENTER_IMPORTANCE[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 2, 5, 
        5, 2, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 5, 8, 8, 5, 2, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
        5, 8, 8, 5, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 2, 5, 5, 2, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
    public static final byte RANK_IMPORTANCE[] = {
        0, 0, 0, 0, 12, 12, 12, 12, 12, 12, 
        12, 12, 0, 0, 0, 0, 0, 0, 0, 0, 
        12, 12, 12, 12, 12, 12, 12, 12, 0, 0, 
        0, 0, 0, 0, 0, 0, 6, 6, 6, 6, 
        6, 6, 6, 6, 0, 0, 0, 0, 0, 0, 
        0, 0, 3, 3, 3, 3, 3, 3, 3, 3, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0
    };
 
    public Evaluate()
    {
    }
 
    public static boolean IN_BOARD(int sq)
    {
        return Position.IN_BOARD(sq);
    }
 
    public static int SQUARE_FLIP(int sq)
    {
        return Position.SQUARE_FLIP(sq);
    }
 
    public static int losingKingValue(int sq)
    {
        return -ENDGAME_KING_PENALTY[sq] * 2 - ENDGAME_BOTTOM[sq] * 8;
    }
 
    public static int winningKingValue(int sq, int sqOppKing)
    {
        return -DISTANCE[(sqOppKing - sq) + 128] * 2 - ENDGAME_EDGE[sq] * 8;
    }
 
    public static int calcRookControl(Position pos, int sqSrc, short attack[])
    {
        return calcSlideControl(pos, sqSrc, attack, true);
    }
 
    public static int calcBishopControl(Position pos, int sqSrc, short attack[])
    {
        return calcSlideControl(pos, sqSrc, attack, false);
    }
 
    public static int calcSlideControl(Position pos, int sqSrc, short attack[], boolean isRook)
    {
        int control = 0;
        for(int i = 0; i < 4; i++)
        {
            int delta = isRook ? Position.ROOK_DELTA[i] : Position.BISHOP_DELTA[i];
            int sqDst = sqSrc + delta;
            boolean direct = true;
            for(; IN_BOARD(sqDst); sqDst += delta)
            {
                control += direct ? ((int) (attack[sqDst])) : attack[sqDst] / 2;
                if(pos.squares[sqDst] <= 0)
                {
                    continue;
                }
                int pieceType = Position.PIECE_TYPE(pos.squares[sqDst]);
                if(pieceType == 5)
                {
                    break;
                }
                if(pieceType == 0 || pieceType == 4 || pieceType == (isRook ? 3 : 2))
                {
                    direct = false;
                }
            }
 
        }
 
        return control;
    }
 
    public static void preEval(Position pos)
    {
        int vlWhite = 0;
        int vlBlack = 0;
        int sqWhiteKing = 0;
        int sqBlackKing = 0;
        for(int sq = 0; sq < 128; sq++)
        {
            int pc = pos.squares[sq];
            if(pc != 0)
            {
                if(pc < 16)
                {
                    vlWhite += PIECE_VALUE[pc - 8];
                    if(pc == 8)
                    {
                        sqWhiteKing = sq;
                    }
                } else
                {
                    vlBlack += PIECE_VALUE[pc - 16];
                    if(pc == 16)
                    {
                        sqBlackKing = sq;
                    }
                }
            }
        }
 
        boolean inEndgame = Math.min(vlWhite, vlBlack) <= 6 && Math.abs(vlWhite - vlBlack) >= 2;
        short whiteAttack[] = new short[128];
        short blackAttack[] = new short[128];
        for(int sq = 0; sq < 128; sq++)
        {
            whiteAttack[sq] = blackAttack[SQUARE_FLIP(sq)] = (short)((RANK_IMPORTANCE[sq] * Math.max((vlWhite + vlBlack) - 24, 8)) / 32 + CENTER_IMPORTANCE[sq]);
        }
 
        for(int i = 0; i < 8; i++)
        {
            int importance = (12 * Math.max((vlWhite + vlBlack) - 24, 8)) / 32;
            int sq = sqWhiteKing + Position.KING_DELTA[i];
            if(IN_BOARD(sq))
            {
                blackAttack[sq] += importance;
            }
            sq = sqBlackKing + Position.KING_DELTA[i];
            if(IN_BOARD(sq))
            {
                whiteAttack[sq] += importance;
            }
        }
 
        short whiteRookControl[] = new short[128];
        short whiteBishopControl[] = new short[128];
        short blackRookControl[] = new short[128];
        short blackBishopControl[] = new short[128];
        for(int sq = 0; sq < 128; sq++)
        {
            if(IN_BOARD(sq))
            {
                whiteRookControl[sq] = (short)calcRookControl(pos, sq, whiteAttack);
                blackRookControl[sq] = (short)calcRookControl(pos, sq, blackAttack);
                whiteBishopControl[sq] = (short)calcBishopControl(pos, sq, whiteAttack);
                blackBishopControl[sq] = (short)calcBishopControl(pos, sq, blackAttack);
            }
        }
 
        for(int sq = 0; sq < 128; sq++)
        {
            if(IN_BOARD(sq))
            {
                int edgePenalty = EDGE_PENALTY[sq];
                if(inEndgame)
                {
                    if(vlWhite < vlBlack)
                    {
                        pos.vlWhitePiecePos[0][sq] = (short)losingKingValue(sq);
                        pos.vlBlackPiecePos[0][sq] = (short)winningKingValue(sq, sqWhiteKing);
                    } else
                    {
                        pos.vlBlackPiecePos[0][sq] = (short)losingKingValue(sq);
                        pos.vlWhitePiecePos[0][sq] = (short)winningKingValue(sq, sqBlackKing);
                    }
                    for(int i = 1; i <= 4; i++)
                    {
                        pos.vlWhitePiecePos[i][sq] = pos.vlBlackPiecePos[i][sq] = (short)(PIECE_VALUE[i] * 100);
                    }
 
                } else
                {
                    if(vlWhite + vlBlack <= 32)
                    {
                        pos.vlWhitePiecePos[0][sq] = pos.vlBlackPiecePos[0][sq] = (short)(-edgePenalty);
                    } else
                    {
                        pos.vlWhitePiecePos[0][sq] = pos.vlBlackPiecePos[0][sq] = 0;
                    }
                    pos.vlWhitePiecePos[1][sq] = (short)(PIECE_VALUE[1] * 100 + (whiteRookControl[sq] + whiteBishopControl[sq]) / 8);
                    pos.vlBlackPiecePos[1][sq] = (short)(PIECE_VALUE[1] * 100 + (blackRookControl[sq] + blackBishopControl[sq]) / 8);
                    pos.vlWhitePiecePos[2][sq] = (short)(PIECE_VALUE[2] * 100 + whiteRookControl[sq] / 2);
                    pos.vlBlackPiecePos[2][sq] = (short)(PIECE_VALUE[2] * 100 + blackRookControl[sq] / 2);
                    pos.vlWhitePiecePos[3][sq] = (short)(PIECE_VALUE[3] * 100 + whiteBishopControl[sq] / 2);
                    pos.vlBlackPiecePos[3][sq] = (short)(PIECE_VALUE[3] * 100 + blackBishopControl[sq] / 2);
                    int whiteKnightAttack = 0;
                    int blackKnightAttack = 0;
                    for(int i = 0; i < 8; i++)
                    {
                        int sqDst = sq + Position.KNIGHT_DELTA[i];
                        if(IN_BOARD(sqDst))
                        {
                            whiteKnightAttack += whiteAttack[sqDst];
                            blackKnightAttack += blackAttack[sqDst];
                        }
                    }
 
                    pos.vlWhitePiecePos[4][sq] = (short)((PIECE_VALUE[4] * 100 + whiteKnightAttack / 4) - (edgePenalty * 3) / 2);
                    pos.vlBlackPiecePos[4][sq] = (short)((PIECE_VALUE[4] * 100 + blackKnightAttack / 4) - (edgePenalty * 3) / 2);
                }
                pos.vlWhitePiecePos[5][sq] = pos.vlBlackPiecePos[5][SQUARE_FLIP(sq)] = (short)((PIECE_VALUE[5] * 100 + PAWN_VALUE[sq] / 2) - 6);
            }
        }
 
        for(int sd = 0; sd < 2; sd++)
        {
            int brSelf = 0;
            int brSide = 0;
            int brBehindOppPass = 0;
            int brOppPass = 4080;
            for(int i = 1; i <= 6; i++)
            {
                int y = sd != 0 ? i : 7 - i;
                int brOpp = sd != 0 ? pos.brWhitePawn[y] : pos.brBlackPawn[y];
                brOppPass &= ~(brSelf | brSide);
                brBehindOppPass |= brOppPass & brOpp;
                int brChain = brSide;
                brSelf = sd != 0 ? pos.brBlackPawn[y] : pos.brWhitePawn[y];
                brSide = (brSelf >> 1 | brSelf << 1) & 0xff0;
                int brForward = sd != 0 ? pos.brBlackPawn[y + 1] : pos.brWhitePawn[y + 1];
                int brLeftCover = brForward >> 1 & 0xff0;
                int brRightCover = brForward << 1 & 0xff0;
                for(int x = 4; x <= 11; x++)
                {
                    int sq = Position.COORD_XY(x, y);
                    int brSquare = 1 << x;
                    int value = ((brSide & brSquare) == 0 ? 0 : 3) + ((brChain & brSquare) == 0 ? 0 : 2);
                    value += ((brLeftCover & brSquare) == 0 ? 0 : 2) + ((brRightCover & brSquare) == 0 ? 0 : 2);
                    value += (brSelf & brSquare) == 0 ? 0 : 1;
                    if(sd == 0)
                    {
                        pos.vlWhitePiecePos[5][sq] += value;
                    } else
                    {
                        pos.vlBlackPiecePos[5][sq] += value;
                    }
                    if(vlWhite + vlBlack <= 32)
                    {
                        if((brOppPass & brSquare) != 0)
                        {
                            if(sd == 0)
                            {
                                pos.vlBlackPiecePos[5][sq] += PASS_PAWN[i];
                            } else
                            {
                                pos.vlWhitePiecePos[5][sq] += PASS_PAWN[i];
                            }
                        }
                        if((brBehindOppPass & brSquare) != 0)
                        {
                            pos.vlWhitePiecePos[2][sq] += 8;
                            pos.vlBlackPiecePos[2][sq] += 8;
                            if(i == 6)
                            {
                                int sqBottom = sq + Position.FORWARD_DELTA(sd);
                                pos.vlWhitePiecePos[2][sqBottom] += 8;
                                pos.vlBlackPiecePos[2][sqBottom] += 8;
                            }
                        }
                    }
                }
 
            }
 
        }
 
        for(int sq = 103; sq <= 104; sq++)
        {
            if(pos.squares[sq] == 13)
            {
                pos.vlWhitePiecePos[3][sq - 16] -= 10;
            }
        }
 
        for(int sq = 23; sq <= 24; sq++)
        {
            if(pos.squares[sq] == 21)
            {
                pos.vlBlackPiecePos[3][sq + 16] -= 10;
            }
        }
 
        pos.vlWhite = pos.vlBlack = 0;
        for(int sq = 0; sq < 128; sq++)
        {
            int pc = pos.squares[sq];
            if(pc > 0)
            {
                if(pc < 16)
                {
                    pos.vlWhite += pos.vlWhitePiecePos[pc - 8][sq];
                } else
                {
                    pos.vlBlack += pos.vlBlackPiecePos[pc - 16][sq];
                }
            }
        }
 
    }
 
    public static int evaluate(Position pos, int vlAlpha, int vlBeta)
    {
        int vl = pos.material();
        if(vl + 100 <= vlAlpha)
        {
            return vl + 100;
        }
        if(vl - 100 >= vlBeta)
        {
            return vl - 100;
        }
        for(int sd = 0; sd < 2; sd++)
        {
            int brSingle = 0;
            int brDouble = 0;
            int brs[] = sd != 0 ? pos.brBlackPawn : pos.brWhitePawn;
            for(int i = 1; i <= 6; i++)
            {
                brDouble |= brSingle & brs[i];
                brSingle |= brs[i];
            }
 
            int brIsolated = brSingle & ~(brSingle << 1 | brSingle >> 1);
            int penalty = Util.POP_COUNT_16(brDouble) * 4 + Util.POP_COUNT_16(brIsolated) * 10 + Util.POP_COUNT_16(brIsolated & brDouble) * 10 * 2;
            vl += pos.sdPlayer != sd ? penalty : -penalty;
        }
 
        return vl;
    }
 
}
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  15. June 15th, 2012, 12:39 PM #14
    Norm
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    Default Re: This is a link to full executable jar file.

    I have decompiled the jar.
    If you do not have the original source with the author's comments, you will have to spend lots of time trying to figure out what the code does and why it is doing what it does.

    Good luck.
    If you don't understand my answer, don't ignore it, ask a question.
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  16. June 16th, 2012, 12:42 AM #15
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    how can i know if i don know what is distance refering ?
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  17. June 16th, 2012, 06:43 AM #16
    Norm
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    Default Re: This is a link to full executable jar file.

    Look at the source and see how it is used.
    If you don't understand my answer, don't ignore it, ask a question.
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  18. June 16th, 2012, 10:28 PM #17
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    Quote Originally Posted by Norm View Post
    Look at the source and see how it is used.
    I looked ,problem is 256 values how used for 64 squares of chessboard? in functions also only, int sq ,i.e. final value is used. if i remove it,no error in compiling but as a whole program no work ,why ?
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  19. June 17th, 2012, 07:17 AM #18
    Norm
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    Default Re: This is a link to full executable jar file.

    if i remove it, no error in compiling
    If the array is not used, you can remove it and there should not be any compiler errors and the execution of the program should not change.

    Its strange there are no compiler errors. There should be an error for the line in this method:
      public static int winningKingValue(int sq, int sqOppKing)
    {
        return -DISTANCE[(sqOppKing - sq) + 128] * 2 - ENDGAME_EDGE[sq] * 8;
    }
    If you don't understand my answer, don't ignore it, ask a question.
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  20. June 17th, 2012, 10:12 AM #19
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    Quote Originally Posted by Norm View Post
    If the array is not used, you can remove it and there should not be any compiler errors and the execution of the program should not change.

    Its strange there are no compiler errors. There should be an error for the line in this method:
      public static int winningKingValue(int sq, int sqOppKing)
    {
        return -DISTANCE[(sqOppKing - sq) + 128] * 2 - ENDGAME_EDGE[sq] * 8;
    }
    could be because the final byte value null??
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  21. June 17th, 2012, 10:13 AM #20
    Norm
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    Default Re: This is a link to full executable jar file.

    byte variables can not have a null value.
    If you don't understand my answer, don't ignore it, ask a question.
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  22. June 17th, 2012, 10:32 AM #21
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    I have found same code on googlecode :http://j2me-chess.googlecode.com/svn.../Evaluate.java
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  23. June 17th, 2012, 10:55 AM #22
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    (1)It explains function.
    (2)I was right for alpha beta.
    (3)it shows squares as byte values.
    (4)here also endgame edge and bottom make sense.
    (5)square of distance (byte values) not match as board.
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  24. June 17th, 2012, 11:04 AM #23
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    Quote Originally Posted by Norm View Post
    byte variables can not have a null value.
    yes , that is.
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  25. June 25th, 2012, 09:42 AM #24
    rajeshverma
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    Default Re: This is a link to full executable jar file.

    can i get answer of this? if yes,how where?
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  26. June 25th, 2012, 09:44 AM #25
    Norm
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    Default Re: This is a link to full executable jar file.

    Ask the author
    If you don't understand my answer, don't ignore it, ask a question.
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