djib/Sushi
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Version 0.5.6

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=============
Now has weights for each piece.
Now detects endgame (uses different evaluation function)
This commit is contained in:
Jean-Baptiste Hétier
2006-06-30 17:10:53 +00:00
parent e9d5fe78a7
commit 74206376a7
3 changed files with 81 additions and 28 deletions
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72
src/suicideChess/Board.java
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@ -30,6 +30,9 @@ public class Board {
public static final int NB_OF_SQUARES = NB_OF_RANKS*NB_OF_FILES;
private static final int NB_OF_BITBOARDS = 14;
//with less than that many pawns on one side, the computer will enter endgame mode
public static final int ENDGAME = 3;
@SuppressWarnings("serial")
public class NoPieceOnSquare extends Exception {
@ -83,11 +86,11 @@ public class Board {
private boolean enPassant=false; //is there an 'en passant pawn' on the board
private Square enPassantSquare;
private int numberOfBlackPieces = NB_OF_FILES*2;
private int numberOfWhitePieces = NB_OF_FILES*2;
private int[] numberOfPieces = new int[Piece.MAX_PIECE_NUMBER];
{ numberOfPieces[Piece.BLACK_BISHOP]=2;
}
//the number of each piece type will be accessed
//using the index and the piece value defined in Piece class
private int[] numberOfPieces;
//the value of each piece (used for the evaluation function)
private int boardValue = 0; //evaluation of the board value
private int currentPlayer; //color of the current player.
@ -105,6 +108,11 @@ public class Board {
//the following line makes sure that enPassantSquare is defined at some point.
enPassantSquare = new Square("a1");
numberOfPieces = new int[Piece.MAX_PIECE_NUMBER+1];
for (int i=0; i<=Piece.MAX_PIECE_NUMBER; i++) {
numberOfPieces[i]=0;
}
bitBoards = new long[NB_OF_BITBOARDS];
addPiece(new Square("a1"),new Piece(Piece.WHITE_ROOK));
addPiece(new Square("b1"),new Piece(Piece.WHITE_KNIGHT));
@ -150,8 +158,11 @@ public class Board {
*/
public Board(Board bitboard) {
this.numberOfBlackPieces = bitboard.numberOfBlackPieces;
this.numberOfWhitePieces = bitboard.numberOfWhitePieces;
numberOfPieces = new int[Piece.MAX_PIECE_NUMBER+1];
for (int i=0; i<=Piece.MAX_PIECE_NUMBER; i++) {
this.numberOfPieces[i] = bitboard.numberOfPieces[i];
}
this.boardValue = bitboard.boardValue;
this.bitBoards = new long[NB_OF_BITBOARDS];
for (int i=0; i<NB_OF_BITBOARDS; i++) {
@ -204,8 +215,8 @@ public class Board {
enPassantSquare = new Square("a1"); //otherwise it is null
}
numberOfBlackPieces = 0;
numberOfWhitePieces = 0;
numberOfPieces = new int[Piece.MAX_PIECE_NUMBER];
for(int split=0; split < 8; split++) {
int offset=0;
@ -216,19 +227,14 @@ public class Board {
} else {
Piece pieceToAdd = new Piece(rowToParse[character]);
addPiece(new Square(character+offset+1,NB_OF_RANKS-split),pieceToAdd);
if (pieceToAdd.getColor()==Piece.BLACK) {
numberOfBlackPieces++;
} else {
numberOfWhitePieces++;
}
}
}
}
if (numberOfBlackPieces == 0) {
if (numberOfPieces[Piece.BLACK] == 0) {
boardValue = BLACK_WINS;
} else if (numberOfWhitePieces == 0){
} else if (numberOfPieces[Piece.WHITE] == 0){
boardValue = WHITE_WINS;
} else if (!Rules.isThereALegalMovesForPlayer(this)) {
if (currentPlayer==Piece.WHITE) {
@ -466,6 +472,7 @@ public class Board {
System.out.println(" +---+---+---+---+---+---+---+---+");
System.out.println(" a b c d e f g h");
System.out.println();
}
@ -483,11 +490,14 @@ public class Board {
//OR :
// 0 OR a = a
// 1 OR a = 1
//add Piece to corresponding bitboard.
bitBoards[piece.getPieceNumber()] |= mapSquaresToBits[squareToBitBoardSquare(square)];
//update the bitboard of all pieces of that color
bitBoards[piece.getColor()] |= mapSquaresToBits[squareToBitBoardSquare(square)];
numberOfPieces[piece.getPieceNumber()] += 1;
numberOfPieces[piece.getColor()] += 1;
}
protected void removePiece(Square square, Piece piece) throws NoPieceOnSquare {
@ -508,7 +518,10 @@ public class Board {
}
//update the bitboard of all pieces of that color
bitBoards[piece.getColor()] ^= mapSquaresToBits[squareToBitBoardSquare(square)];;
}
numberOfPieces[piece.getPieceNumber()] -= 1;
numberOfPieces[piece.getColor()] -= 1;
}
//used by function display()
private boolean displayPiece(int whatToDisplay, long mask) {
@ -522,18 +535,25 @@ public class Board {
private void evaluateNewBoardValue (Move move) throws NotAValidSquare {
if (move.isCaptureMove()) {
if (move.getCapturedPiece().getColor()==Piece.BLACK) {
numberOfBlackPieces--;
} else {
numberOfWhitePieces--;
}
if (numberOfBlackPieces == 0) {
if (numberOfPieces[Piece.BLACK] == 0) {
boardValue = BLACK_WINS;
} else if (numberOfWhitePieces == 0){
} else if (numberOfPieces[Piece.WHITE] == 0){
boardValue = WHITE_WINS;
} else {
//this is a very very basic evaluation function that will be changed.
boardValue = numberOfBlackPieces - numberOfWhitePieces;
//boardValue = numberOfBlackPieces - numberOfWhitePieces;
boardValue = 0;
if((numberOfPieces[Piece.BLACK_PAWN] <= ENDGAME) || (numberOfPieces[Piece.WHITE_PAWN] <= ENDGAME)) {
System.out.println("Playing endgame");
for (int i = Piece.OFFSET; i<=Piece.MAX_PIECE_NUMBER; i++) {
boardValue += numberOfPieces[i]*Piece.PIECE_VALUE_ENDGAME[i];
}
} else {
System.out.println("Playing midgame");
for (int i = Piece.OFFSET; i<=Piece.MAX_PIECE_NUMBER; i++) {
boardValue += numberOfPieces[i]*Piece.PIECE_VALUE_MIDDLEGAME[i];
}
}
}
}
if (!Rules.isThereALegalMovesForPlayer(this)) {

35
src/suicideChess/Piece.java
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@ -48,6 +48,9 @@ public class Piece {
public static final int BLACK_ROOK = 2*(ROOK+1) + BLACK;
public static final int MAX_PIECE_NUMBER = BLACK_ROOK;
//offset used for table indexing
public static final int OFFSET = WHITE_PAWN;
public static final int NB_OF_PIECES = ROOK + 1;
//Constants used for promotion (as used in the xboard protocol)
@ -71,7 +74,37 @@ public class Piece {
public static final char BLACK_ROOK_CHAR='r';
public static final char BLACK_PAWN_CHAR='p';
public static final int[] PIECE_VALUE_MIDDLEGAME = new int[Piece.MAX_PIECE_NUMBER+1];
public static final int[] PIECE_VALUE_ENDGAME = new int[Piece.MAX_PIECE_NUMBER+1];
static {
PIECE_VALUE_MIDDLEGAME[WHITE_KING]=50;
PIECE_VALUE_MIDDLEGAME[WHITE_QUEEN]=90;
PIECE_VALUE_MIDDLEGAME[WHITE_ROOK]=35;
PIECE_VALUE_MIDDLEGAME[WHITE_KNIGHT]=30;
PIECE_VALUE_MIDDLEGAME[WHITE_BISHOP]=-10;
PIECE_VALUE_MIDDLEGAME[WHITE_PAWN]=10;
PIECE_VALUE_MIDDLEGAME[BLACK_KING]=-PIECE_VALUE_MIDDLEGAME[WHITE_KING];
PIECE_VALUE_MIDDLEGAME[BLACK_QUEEN]=-PIECE_VALUE_MIDDLEGAME[WHITE_QUEEN];
PIECE_VALUE_MIDDLEGAME[BLACK_ROOK]=-PIECE_VALUE_MIDDLEGAME[WHITE_ROOK];
PIECE_VALUE_MIDDLEGAME[BLACK_KNIGHT]=-PIECE_VALUE_MIDDLEGAME[WHITE_KNIGHT];
PIECE_VALUE_MIDDLEGAME[BLACK_BISHOP]=-PIECE_VALUE_MIDDLEGAME[WHITE_BISHOP];
PIECE_VALUE_MIDDLEGAME[BLACK_PAWN]=-PIECE_VALUE_MIDDLEGAME[WHITE_PAWN];
PIECE_VALUE_ENDGAME[WHITE_KING]=-40;
PIECE_VALUE_ENDGAME[WHITE_QUEEN]=-40;
PIECE_VALUE_ENDGAME[WHITE_ROOK]=-10;
PIECE_VALUE_ENDGAME[WHITE_KNIGHT]=-70;
PIECE_VALUE_ENDGAME[WHITE_BISHOP]=-40;
PIECE_VALUE_ENDGAME[WHITE_PAWN]=-90;
PIECE_VALUE_ENDGAME[BLACK_KING]=-PIECE_VALUE_ENDGAME[WHITE_KING];
PIECE_VALUE_ENDGAME[BLACK_QUEEN]=-PIECE_VALUE_ENDGAME[WHITE_QUEEN];
PIECE_VALUE_ENDGAME[BLACK_ROOK]=-PIECE_VALUE_ENDGAME[WHITE_ROOK];
PIECE_VALUE_ENDGAME[BLACK_KNIGHT]=-PIECE_VALUE_ENDGAME[WHITE_KNIGHT];
PIECE_VALUE_ENDGAME[BLACK_BISHOP]=-PIECE_VALUE_ENDGAME[WHITE_BISHOP];
PIECE_VALUE_ENDGAME[BLACK_PAWN]=-PIECE_VALUE_ENDGAME[WHITE_PAWN];
}
/*==============*
* PRIVATE DATA *
*==============*/

2
src/suicideChess/SuicideChess.java
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@ -33,7 +33,7 @@ public class SuicideChess {
/**
* The name to be displayed
*/
public static final String NAME = "djib's SuShi v0.5.2";
public static final String NAME = "djib's SuShi v0.5.5";
/**
* Displays informations in the console.