614 lines
19 KiB
Java
614 lines
19 KiB
Java
package dev.kske.chess.board;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import dev.kske.chess.board.Log.MoveNode;
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import dev.kske.chess.board.Piece.Color;
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import dev.kske.chess.board.Piece.Type;
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/**
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* Project: <strong>Chess</strong><br>
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* File: <strong>Board.java</strong><br>
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* Created: <strong>01.07.2019</strong><br>
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* Author: <strong>Kai S. K. Engelbart</strong>
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*/
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public class Board {
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private Piece[][] boardArr = new Piece[8][8];
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private Map<Color, Position> kingPos = new HashMap<>();
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private Map<Color, Map<Type, Boolean>> castlingRights = new HashMap<>();
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private Log log = new Log();
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private static final Map<Type, int[][]> positionScores;
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static {
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positionScores = new HashMap<>();
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positionScores.put(Type.KING,
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new int[][] { new int[] { -3, -4, -4, -5, -5, -4, -4, -3 },
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new int[] { -3, -4, -4, -5, -4, -4, -4, -3 }, new int[] { -3, -4, -4, -5, -4, -4, -4, -3 },
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new int[] { -3, -4, -4, -5, -4, -4, -4, -3 }, new int[] { -2, -3, -3, -2, -2, -2, -2, -1 },
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new int[] { -1, -2, -2, -2, -2, -2, -2, -1 }, new int[] { 2, 2, 0, 0, 0, 0, 2, 2 },
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new int[] { 2, 3, 1, 0, 0, 1, 3, 2 } });
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positionScores.put(Type.QUEEN,
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new int[][] { new int[] { -2, -1, -1, -1, -1, -1, -1, -2 }, new int[] { -1, 0, 0, 0, 0, 0, 0, -1 },
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new int[] { -1, 0, 1, 1, 1, 1, 0, -1 }, new int[] { -1, 0, 1, 1, 1, 1, 0, -1 },
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new int[] { 0, 0, 1, 1, 1, 1, 0, -1 }, new int[] { -1, 1, 1, 1, 1, 1, 0, -1 },
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new int[] { -1, 0, 1, 0, 0, 0, 0, -1 }, new int[] { -2, -1, -1, -1, -1, -1, -1, -2 } });
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positionScores.put(Type.ROOK,
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new int[][] { new int[] { 0, 0, 0, 0, 0, 0, 0, 0 }, new int[] { 1, 1, 1, 1, 1, 1, 1, 1 },
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new int[] { -1, 0, 0, 0, 0, 0, 0, -1 }, new int[] { -1, 0, 0, 0, 0, 0, 0, -1 },
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new int[] { -1, 0, 0, 0, 0, 0, 0, -1 }, new int[] { -1, 0, 0, 0, 0, 0, 0, -1 },
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new int[] { -1, 0, 0, 0, 0, 0, 0, -1 }, new int[] { 0, 0, 0, 1, 1, 0, 0, 0 } });
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positionScores.put(Type.KNIGHT,
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new int[][] { new int[] { -5, -4, -3, -3, -3, -3, -4, -5 }, new int[] { -4, -2, 0, 0, 0, 0, -2, -4 },
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new int[] { -3, 0, 1, 2, 2, 1, 0, -3 }, new int[] { -3, 1, 2, 2, 2, 2, 1, -3 },
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new int[] { -3, 0, 2, 2, 2, 2, 0, -1 }, new int[] { -3, 1, 1, 2, 2, 1, 1, -3 },
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new int[] { -4, -2, 0, 1, 1, 0, -2, -4 }, new int[] { -5, -4, -3, -3, -3, -3, -4, -5 } });
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positionScores.put(Type.BISHOP,
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new int[][] { new int[] { -2, -1, -1, -1, -1, -1, -1, 2 }, new int[] { -1, 0, 0, 0, 0, 0, 0, -1 },
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new int[] { -1, 0, 1, 1, 1, 1, 0, -1 }, new int[] { -1, 1, 1, 1, 1, 1, 1, -1 },
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new int[] { -1, 0, 1, 1, 1, 1, 0, -1 }, new int[] { -1, 1, 1, 1, 1, 1, 1, -1 },
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new int[] { -1, 1, 0, 0, 0, 0, 1, -1 }, new int[] { -2, -1, -1, -1, -1, -1, -1, -2 } });
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positionScores.put(Type.PAWN,
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new int[][] { new int[] { 0, 0, 0, 0, 0, 0, 0, 0 }, new int[] { 5, 5, 5, 5, 5, 5, 5, 5 },
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new int[] { 1, 1, 2, 3, 3, 2, 1, 1 }, new int[] { 0, 0, 1, 3, 3, 1, 0, 0 },
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new int[] { 0, 0, 0, 2, 2, 0, 0, 0 }, new int[] { 0, 0, -1, 0, 0, -1, 0, 0 },
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new int[] { 0, 1, 1, -2, -2, 1, 1, 0 }, new int[] { 0, 0, 0, 0, 0, 0, 0, 0 } });
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}
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/**
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* Initializes the board with the default chess starting position.
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*/
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public Board() {
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initDefaultPositions();
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}
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/**
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* Initializes the board with data from a FEN-string.
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*
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* @param fen The FEN-string to initialize the board from
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*/
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public Board(String fen) {
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initFromFEN(fen);
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}
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/**
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* Creates a copy of another {@link Board} instance.<br>
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* The created object is a deep copy, but does not contain any move history
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* apart from the current {@link MoveNode}.
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*
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* @param other The {@link Board} instance to copy
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*/
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public Board(Board other) {
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boardArr = new Piece[8][8];
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for (int i = 0; i < 8; i++)
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for (int j = 0; j < 8; j++) {
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if (other.boardArr[i][j] == null) continue;
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boardArr[i][j] = (Piece) other.boardArr[i][j].clone();
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boardArr[i][j].board = this;
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}
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kingPos.putAll(other.kingPos);
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Map<Type, Boolean> whiteCastling = new HashMap<>(other.castlingRights.get(Color.WHITE)),
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blackCastling = new HashMap<>(other.castlingRights.get(Color.BLACK));
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castlingRights.put(Color.WHITE, whiteCastling);
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castlingRights.put(Color.BLACK, blackCastling);
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log = new Log(other.log, false);
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}
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/**
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* Moves a piece across the board if the move is legal.
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*
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* @param move The move to execute
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* @return {@code true}, if the attempted move was legal and thus executed
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*/
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public boolean attemptMove(Move move) {
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Piece piece = getPos(move);
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if (piece == null || !piece.isValidMove(move)) return false;
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else {
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// Set type after validation
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if (move.type == Move.Type.UNKNOWN) move.type = Move.Type.NORMAL;
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// Move piece
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move(move);
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// Revert move if it caused a check for its team
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if (checkCheck(piece.getColor())) {
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revert();
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return false;
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}
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return true;
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}
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}
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/**
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* Moves a piece across the board without checking if the move is legal.
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*
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* @param move The move to execute
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*/
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public void move(Move move) {
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Piece piece = getPos(move);
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Piece capturePiece = getDest(move);
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switch (move.type) {
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case PAWN_PROMOTION:
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setPos(move, null);
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// TODO: Select promotion
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setDest(move, new Queen(piece.getColor(), this));
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break;
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case EN_PASSANT:
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setDest(move, piece);
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setPos(move, null);
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boardArr[move.dest.x][move.dest.y - move.ySign] = null;
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break;
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case CASTLING:
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// Move the king
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setDest(move, piece);
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setPos(move, null);
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// Move the rook
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Move rookMove = move.dest.x == 6 ? new Move(7, move.pos.y, 5, move.pos.y) // Kingside
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: new Move(0, move.pos.y, 3, move.pos.y); // Queenside
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// Move the rook
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setDest(rookMove, getPos(rookMove));
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setPos(rookMove, null);
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getDest(rookMove).incMoveCounter();
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break;
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case UNKNOWN:
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System.err.printf("Move of unknown type %s found!%n", move);
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case NORMAL:
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setDest(move, piece);
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setPos(move, null);
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break;
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default:
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System.err.printf("Move %s of unimplemented type found!%n", move);
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}
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// Increment move counter
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getDest(move).incMoveCounter();
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// Update the king's position if the moved piece is the king and castling
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// availability
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if (piece.getType() == Type.KING) kingPos.put(piece.getColor(), move.dest);
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// Update log
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log.add(move, capturePiece, piece.getType() == Type.PAWN);
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updateCastlingRights();
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}
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/**
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* Reverts the last move.
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*/
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public void revert() {
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MoveNode moveNode = log.getLast();
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Move move = moveNode.move;
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Piece capturedPiece = moveNode.capturedPiece;
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switch (move.type) {
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case PAWN_PROMOTION:
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setPos(move, new Pawn(getDest(move).getColor(), this));
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setDest(move, capturedPiece);
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break;
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case EN_PASSANT:
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setPos(move, getDest(move));
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setDest(move, null);
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boardArr[move.dest.x][move.dest.y - move.ySign] = new Pawn(getPos(move).getColor().opposite(), this);
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break;
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case CASTLING:
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// Move the king
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setPos(move, getDest(move));
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setDest(move, null);
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// Move the rook
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Move rookMove = move.dest.x == 6 ? new Move(5, move.pos.y, 7, move.pos.y) // Kingside
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: new Move(3, move.pos.y, 0, move.pos.y); // Queenside
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setDest(rookMove, getPos(rookMove));
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setPos(rookMove, null);
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getDest(rookMove).decMoveCounter();
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break;
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case UNKNOWN:
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System.err.printf("Move of unknown type %s found!%n", move);
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case NORMAL:
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setPos(move, getDest(move));
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setDest(move, capturedPiece);
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break;
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default:
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System.err.printf("Move %s of unimplemented type found!%n", move);
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}
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// Decrement move counter
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getPos(move).decMoveCounter();
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// Update the king's position if the moved piece is the king
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if (getPos(move).getType() == Type.KING) kingPos.put(getPos(move).getColor(), move.pos);
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// Update log
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log.removeLast();
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updateCastlingRights();
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}
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private void updateCastlingRights() {
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// White
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if (new Position(4, 7).equals(kingPos.get(Color.WHITE))) {
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final King king = (King) get(kingPos.get(Color.WHITE));
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castlingRights.get(Color.WHITE).put(Type.KING, king.canCastleKingside());
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castlingRights.get(Color.WHITE).put(Type.QUEEN, king.canCastleQueenside());
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} else {
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castlingRights.get(Color.WHITE).put(Type.KING, false);
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castlingRights.get(Color.WHITE).put(Type.QUEEN, false);
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}
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// Black
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if (new Position(4, 0).equals(kingPos.get(Color.BLACK))) {
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final King king = (King) get(kingPos.get(Color.BLACK));
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castlingRights.get(Color.BLACK).put(Type.KING, king.canCastleKingside());
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castlingRights.get(Color.BLACK).put(Type.QUEEN, king.canCastleQueenside());
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} else {
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castlingRights.get(Color.BLACK).put(Type.KING, false);
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castlingRights.get(Color.BLACK).put(Type.QUEEN, false);
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}
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}
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/**
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* Generated every legal move for one color
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*
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* @param color The color to generate the moves for
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* @return A list of all legal moves
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*/
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public List<Move> getMoves(Color color) {
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List<Move> moves = new ArrayList<>();
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for (int i = 0; i < 8; i++)
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for (int j = 0; j < 8; j++)
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if (boardArr[i][j] != null && boardArr[i][j].getColor() == color)
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moves.addAll(boardArr[i][j].getMoves(new Position(i, j)));
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return moves;
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}
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public List<Move> getMoves(Position pos) {
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return get(pos).getMoves(pos);
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}
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/**
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* Checks, if the king is in check.
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*
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* @param color The color of the king to check
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* @return {@code true}, if the king is in check
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*/
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public boolean checkCheck(Color color) {
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for (int i = 0; i < 8; i++)
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for (int j = 0; j < 8; j++) {
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Position pos = new Position(i, j);
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if (get(pos) != null && get(pos).getColor() != color
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&& get(pos).isValidMove(new Move(pos, kingPos.get(color))))
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return true;
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}
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return false;
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}
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/**
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* Checks, if the king is in checkmate.
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* This requires the king to already be in check!
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*
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* @param color The color of the king to check
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* @return {@code true}, if the king is in checkmate
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*/
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public boolean checkCheckmate(Color color) {
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// Return false immediately if the king can move
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if (!getMoves(kingPos.get(color)).isEmpty()) return false;
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else {
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for (Move move : getMoves(color)) {
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move(move);
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boolean check = checkCheck(color);
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revert();
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if (!check) return false;
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}
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return true;
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}
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}
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public GameState getGameEventType(Color color) {
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return checkCheck(color) ? checkCheckmate(color) ? GameState.CHECKMATE : GameState.CHECK
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: getMoves(color).isEmpty() || log.getLast().halfmoveClock >= 50 ? GameState.STALEMATE
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: GameState.NORMAL;
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}
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/**
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* Evaluated the board.
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*
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* @param color The color to evaluate for
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* @return An positive number representing how good the position is
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*/
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public int evaluate(Color color) {
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int score = 0;
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for (int i = 0; i < 8; i++)
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for (int j = 0; j < 8; j++)
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if (boardArr[i][j] != null && boardArr[i][j].getColor() == color) {
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switch (boardArr[i][j].getType()) {
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case QUEEN:
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score += 90;
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break;
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case ROOK:
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score += 50;
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break;
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case KNIGHT:
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score += 30;
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break;
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case BISHOP:
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score += 30;
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break;
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case PAWN:
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score += 10;
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break;
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}
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if (positionScores.containsKey(boardArr[i][j].getType()))
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score += positionScores.get(boardArr[i][j].getType())[i][color == Color.WHITE ? j : 7 - j];
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}
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return score;
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}
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/**
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* Initialized the board array with the default chess pieces and positions.
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*/
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public void initDefaultPositions() {
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// Initialize pawns
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for (int i = 0; i < 8; i++) {
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boardArr[i][1] = new Pawn(Color.BLACK, this);
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boardArr[i][6] = new Pawn(Color.WHITE, this);
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}
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// Initialize kings
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boardArr[4][0] = new King(Color.BLACK, this);
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boardArr[4][7] = new King(Color.WHITE, this);
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// Initialize king position objects
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kingPos.put(Color.BLACK, new Position(4, 0));
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kingPos.put(Color.WHITE, new Position(4, 7));
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// Initialize queens
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boardArr[3][0] = new Queen(Color.BLACK, this);
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boardArr[3][7] = new Queen(Color.WHITE, this);
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// Initialize rooks
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boardArr[0][0] = new Rook(Color.BLACK, this);
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boardArr[0][7] = new Rook(Color.WHITE, this);
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boardArr[7][0] = new Rook(Color.BLACK, this);
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boardArr[7][7] = new Rook(Color.WHITE, this);
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// Initialize knights
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boardArr[1][0] = new Knight(Color.BLACK, this);
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boardArr[1][7] = new Knight(Color.WHITE, this);
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boardArr[6][0] = new Knight(Color.BLACK, this);
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boardArr[6][7] = new Knight(Color.WHITE, this);
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// Initialize bishops
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boardArr[2][0] = new Bishop(Color.BLACK, this);
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boardArr[2][7] = new Bishop(Color.WHITE, this);
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boardArr[5][0] = new Bishop(Color.BLACK, this);
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boardArr[5][7] = new Bishop(Color.WHITE, this);
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// Clear all other tiles
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for (int i = 0; i < 8; i++)
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for (int j = 2; j < 6; j++)
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boardArr[i][j] = null;
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// Initialize castling rights
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Map<Type, Boolean> whiteCastling = new HashMap<>(), blackCastling = new HashMap<>();
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whiteCastling.put(Type.KING, true);
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whiteCastling.put(Type.QUEEN, true);
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blackCastling.put(Type.KING, true);
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blackCastling.put(Type.QUEEN, true);
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castlingRights.put(Color.WHITE, whiteCastling);
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castlingRights.put(Color.BLACK, blackCastling);
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log.reset();
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}
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/**
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* Initialized the board with a position specified in a FEN-encoded string.
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*
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* @param fen The FEN-encoded string representing target state of the board
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*/
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public void initFromFEN(String fen) {
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String[] parts = fen.split(" ");
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log.reset();
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// Piece placement (from white's perspective)
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String[] rows = parts[0].split("/");
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for (int i = 0; i < 8; i++) {
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char[] places = rows[i].toCharArray();
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for (int j = 0, k = 0; k < places.length; j++, k++) {
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if (Character.isDigit(places[k])) {
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for (int l = j; l < Character.digit(places[k], 10); l++, j++)
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boardArr[j][i] = null;
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--j;
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} else {
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Color color = Character.isUpperCase(places[k]) ? Color.WHITE : Color.BLACK;
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switch (Character.toLowerCase(places[k])) {
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case 'k':
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boardArr[j][i] = new King(color, this);
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kingPos.put(color, new Position(j, i));
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break;
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case 'q':
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boardArr[j][i] = new Queen(color, this);
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break;
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case 'r':
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boardArr[j][i] = new Rook(color, this);
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break;
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case 'n':
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boardArr[j][i] = new Knight(color, this);
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break;
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case 'b':
|
|
boardArr[j][i] = new Bishop(color, this);
|
|
break;
|
|
case 'p':
|
|
boardArr[j][i] = new Pawn(color, this);
|
|
break;
|
|
default:
|
|
System.err.printf("Unknown character '%c' in board declaration of FEN string '%s'%n",
|
|
places[k],
|
|
fen);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Active color
|
|
log.setActiveColor(Color.fromFirstChar(parts[1].charAt(0)));
|
|
|
|
// Castling rights
|
|
Map<Type, Boolean> whiteCastling = new HashMap<>(), blackCastling = new HashMap<>();
|
|
for (char c : parts[2].toCharArray())
|
|
switch (c) {
|
|
case 'K':
|
|
whiteCastling.put(Type.KING, true);
|
|
case 'Q':
|
|
whiteCastling.put(Type.QUEEN, true);
|
|
case 'k':
|
|
blackCastling.put(Type.KING, true);
|
|
case 'q':
|
|
blackCastling.put(Type.QUEEN, true);
|
|
case '-':
|
|
break;
|
|
default:
|
|
System.err
|
|
.printf("Unknown character '%c' in castling rights declaration of FEN string '%s'", c, fen);
|
|
}
|
|
castlingRights.put(Color.WHITE, whiteCastling);
|
|
castlingRights.put(Color.BLACK, blackCastling);
|
|
|
|
// En passant availability
|
|
if (!parts[3].equals("-")) log.setEnPassant(Position.fromSAN(parts[3]));
|
|
|
|
// Halfmove clock
|
|
log.setHalfmoveClock(Integer.parseInt(parts[4]));
|
|
|
|
// Fullmove counter
|
|
log.setFullmoveCounter(Integer.parseInt(parts[5]));
|
|
}
|
|
|
|
/**
|
|
* @return a FEN-encoded string representing the board
|
|
*/
|
|
public String toFEN() {
|
|
StringBuilder sb = new StringBuilder();
|
|
|
|
// Piece placement (from white's perspective)
|
|
for (int i = 0; i < 8; i++) {
|
|
int emptyCount = 0;
|
|
for (int j = 0; j < 8; j++) {
|
|
final Piece piece = boardArr[j][i];
|
|
if (piece == null) ++emptyCount;
|
|
else {
|
|
if (emptyCount != 0) {
|
|
sb.append(emptyCount);
|
|
emptyCount = 0;
|
|
}
|
|
char p = boardArr[j][i].getType().firstChar();
|
|
sb.append(piece.getColor() == Color.WHITE ? Character.toUpperCase(p) : p);
|
|
}
|
|
}
|
|
if (emptyCount != 0) sb.append(emptyCount);
|
|
if (i < 7) sb.append('/');
|
|
}
|
|
|
|
// Active color
|
|
sb.append(" " + log.getActiveColor().firstChar());
|
|
|
|
// Castling Rights
|
|
sb.append(' ');
|
|
StringBuilder castlingSb = new StringBuilder();
|
|
if (castlingRights.get(Color.WHITE).get(Type.KING)) castlingSb.append('K');
|
|
if (castlingRights.get(Color.WHITE).get(Type.QUEEN)) castlingSb.append('Q');
|
|
if (castlingRights.get(Color.BLACK).get(Type.KING)) castlingSb.append('k');
|
|
if (castlingRights.get(Color.BLACK).get(Type.QUEEN)) castlingSb.append('q');
|
|
if (castlingSb.length() == 0) sb.append("-");
|
|
sb.append(castlingSb);
|
|
|
|
final MoveNode lastMove = log.getLast();
|
|
|
|
// En passant availability
|
|
sb.append(" " + (lastMove == null || lastMove.enPassant == null ? "-" : lastMove.enPassant.toSAN()));
|
|
|
|
// Halfmove clock
|
|
sb.append(" " + String.valueOf(lastMove == null ? 0 : lastMove.halfmoveClock));
|
|
|
|
// Fullmove counter
|
|
sb.append(" " + String.valueOf(lastMove == null ? 1 : lastMove.fullmoveCounter));
|
|
|
|
return sb.toString();
|
|
}
|
|
|
|
/**
|
|
* @param pos The position from which to return a piece
|
|
* @return The piece at the position
|
|
*/
|
|
public Piece get(Position pos) {
|
|
return boardArr[pos.x][pos.y];
|
|
}
|
|
|
|
/**
|
|
* Places a piece at a position.
|
|
*
|
|
* @param pos The position to place the piece at
|
|
* @param piece The piece to place
|
|
*/
|
|
public void set(Position pos, Piece piece) {
|
|
boardArr[pos.x][pos.y] = piece;
|
|
}
|
|
|
|
/**
|
|
* @param move The move from which position to return a piece
|
|
* @return The piece at the position of the move
|
|
*/
|
|
public Piece getPos(Move move) {
|
|
return get(move.pos);
|
|
}
|
|
|
|
/**
|
|
* @param move The move from which destination to return a piece
|
|
* @return The piece at the destination of the move
|
|
*/
|
|
public Piece getDest(Move move) {
|
|
return get(move.dest);
|
|
}
|
|
|
|
/**
|
|
* Places a piece at the position of a move.
|
|
*
|
|
* @param move The move at which position to place the piece
|
|
* @param piece The piece to place
|
|
*/
|
|
public void setPos(Move move, Piece piece) {
|
|
set(move.pos, piece);
|
|
}
|
|
|
|
/**
|
|
* Places a piece at the destination of a move.
|
|
*
|
|
* @param move The move at which destination to place the piece
|
|
* @param piece The piece to place
|
|
*/
|
|
public void setDest(Move move, Piece piece) {
|
|
set(move.dest, piece);
|
|
}
|
|
|
|
/**
|
|
* @return The board array
|
|
*/
|
|
public Piece[][] getBoardArr() { return boardArr; }
|
|
|
|
/**
|
|
* @return The move log
|
|
*/
|
|
public Log getLog() { return log; }
|
|
}
|