Android Open Source - android-chess Valuation

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License

The source code is released under:

MIT License

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Java Source Code

package jwtc.chess;
/*from  w w w .j  av  a 2 s  .  com*/
// Valuation. Wrapper class for evaluation

public class Valuation
{
  public Valuation()
  {
    MPD = 70;
    
    DOUBLED_PAWN = 10;
    PASSED_PAWN = 10;
    CASTLED_KING_POS = 10;
    EARLY_QUEEN = 30;
    CENTER_KNIGHT = 5;
    DEVELOPED_KNIGHT = 2;
    BISHOP_MOVE = 2;
    ROOK_MOVE = 2;
    ROOK_RANK_7 = 10;
    ROOK_OPEN_FILE = 10;
  }
  public void setWeights4Test()
  {
    MPD = 150;
    
    DOUBLED_PAWN = 10*3;
    PASSED_PAWN = 10*3;
    CASTLED_KING_POS = 10*3;
    EARLY_QUEEN = 30*3;
    CENTER_KNIGHT = 5*3;
    DEVELOPED_KNIGHT = 2*3;
    BISHOP_MOVE = 2*3;
    ROOK_MOVE = 2*3;
    ROOK_RANK_7 = 10*3;
    ROOK_OPEN_FILE = 10*3;
  }
  // big bonus for a mate - make sure that no sum of an evaluation can ever get bigger than this value
  public static final int MATE = 10000;
  // zero sum based game, so a draw relates to 0
  public static final int DRAW = 0;
  
  // penalty for repeating moves
  public static int DRAW_REPEAT = -10;

  // value of the pieces
  // The standard 1, 3, 3, 6, 9 from pawn, knight, bishop, rook and queen
  // tuned a little for experimentation
  public static int PIECES[] = {100, 300, 305, 600, 1000, 0};

  public static int TRANSPOSITION_MOVE_SCORE = 2000;
  public static int KILLER_MOVE_SCORE = 1500;

  
  public static int LONE_KING = 6; //6*8=48; best value ending = 48
  public static int LONE_KING_BONUS = 150; // 150 after gnu-chess
  
  
  public static int MPD;
  
  public static int DOUBLED_PAWN;
  public static int PASSED_PAWN;
  public static int CASTLED_KING_POS;
  public static int EARLY_QUEEN;
  public static int CENTER_KNIGHT;
  public static int DEVELOPED_KNIGHT;
  public static int BISHOP_MOVE;
  public static int ROOK_MOVE;
  public static int ROOK_RANK_7;
  public static int ROOK_OPEN_FILE;
  
  //
  public static final long CENTER_4x4_SQUARES = 0x00003C3C3C3C0000L;
  public static final long CENTER_SQUARES = 0x00003C7E7E3C0000L;
  
  // positional values to where a king typically get's mated in an end game. 0 is bad is easily mated.
  // after gnu-chess
  public static final int[] KING_ENDINGS = {
        0,  6, 12, 18, 18, 12,  6,  0,
        6, 12, 18, 24, 24, 18, 12,  6,
        12, 18, 24, 32, 32, 24, 18, 12,
        18, 24, 32, 48, 48, 32, 24, 18,
        18, 24, 32, 48, 48, 32, 24, 18,
        12, 18, 24, 32, 32, 24, 18, 12,
        6, 12, 18, 24, 24, 18, 12,  6,
        0,  6, 12, 18, 18, 12,  6,  0
                       };
  // kbnk score, first index is "square color" of the bishop, second index the position of the losing king
  // after gnu-chess
  public static final int KBNK_SCORE[][] = {
      {
    0, 10, 20, 30, 40, 50, 60, 70,
    10, 20, 30, 40, 50, 60, 70, 60,
    20, 30, 40, 50, 60, 70, 60, 50,
    30, 40, 50, 60, 70, 60, 50, 40,
    40, 50, 60, 70, 60, 50, 40, 30,
    50, 60, 70, 60, 50, 40, 30, 20,
    60, 70, 60, 50, 40, 30, 20, 10,
    70, 60, 50, 40, 30, 20, 10,  0
      },
      {
    70, 60, 50, 40, 30, 20, 10,  0,
    60, 70, 60, 50, 40, 30, 20, 10,
    50, 60, 70, 60, 50, 40, 30, 20,
    40, 50, 60, 70, 60, 50, 40, 30,
    30, 40, 50, 60, 70, 60, 50, 40,
    20, 30, 40, 50, 60, 70, 60, 50,
    10, 20, 30, 40, 50, 60, 70, 60,
    0, 10, 20, 30, 40, 50, 60, 70,
      }
      
  };

}

Java Source Code List