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move.c
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move.c
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/***************************************************************************************
* Copyright (c) 2014, Antonio Garro. *
* All rights reserved *
* *
* Redistribution and use in source and binary forms, with or without modification, are *
* permitted provided that the following conditions are met: *
* *
* 1. Redistributions of source code must retain the above copyright notice, this list *
* of conditions and the following disclaimer. *
* *
* 2. Redistributions in binary form must reproduce the above copyright notice, this *
* list of conditions and the following disclaimer in the documentation and/or other *
* materials provided with the distribution. *
* *
* 3. Neither the name of the copyright holder nor the names of its contributors may be *
* used to endorse or promote products derived from this software without specific *
* prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" *
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE *
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE *
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL *
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER *
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF *
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
***************************************************************************************/
#include <stdio.h>
#include "board.h"
inline void RememberCaptured(MOVE *move, PIECE captured)
{
/*captured piece: bits 20-23; 0 if EMPTY, o en passant capture:*/
*move |= (captured << 20);
}
inline void RememberEP(MOVE *move, SQUARE en_passant)
{
/*stores board->en_passant in order to undo.*/
*move |= (en_passant << 24);
}
inline void RememberCastleRight(MOVE *move, unsigned char rights)
{
/*Stores lost castle rights: 'bits promoted' set to 14 if long castle is lost, 1 if short, 15 if both.*/
*move |= (rights << 16);
}
static void RemovePiece(BOARD *board, SQUARE sq)
{
PIECE p = board->squares[sq];
board->zobrist_key ^= zobkeys.zob_pieces[p][sq];
if(p == W_PAWN || p == B_PAWN){
board->pawn_material[GET_COLOR(p)] -= Value(p);
board->pawns[GET_COLOR(p)] = BitboardUnset(sq, board->pawns[GET_COLOR(p)]);
}else if(p != EMPTY && p != W_KING && p != B_KING){
if(p == W_BISHOP || p == B_BISHOP) board->bishops[GET_COLOR(p)]--;
board->piece_material[GET_COLOR(p)] -= Value(p);
}
board->squares[sq] = EMPTY;
}
static void DropPiece(BOARD *board, SQUARE sq, PIECE p)
{
board->zobrist_key ^= zobkeys.zob_pieces[p][sq];
if(p == W_PAWN || p == B_PAWN){
board->pawn_material[GET_COLOR(p)] += Value(p);
board->pawns[GET_COLOR(p)] = BitboardSet(sq, board->pawns[GET_COLOR(p)]);
}else if(p != EMPTY && p != W_KING && p != B_KING){
if(p == W_BISHOP || p == B_BISHOP) board->bishops[GET_COLOR(p)]++;
board->piece_material[GET_COLOR(p)] += Value(p);
}
board->squares[sq] = p;
}
static inline void MoveWhitePawn(BOARD *board, SQUARE orig, SQUARE dest, const MOVE *curr_move)
{
PIECE promoted = PROMMASK(*curr_move);
/*promoted does NOT store the correct color, because algebraic notation does not ensure Q != q.*/
if(ROW(dest) == EIGHT_ROW){ /*Promotion*/
DropPiece(board, dest, TURN_WHITE(promoted));
board->en_passant = INVALID_SQ; /*Invalid square: no pawn en passant.*/
}else{
DropPiece(board, dest, W_PAWN);
if(ROW(dest) == FOURTH_ROW && ROW(orig) == SECOND_ROW){
board->en_passant = dest + ROW_DOWN;
}else{
/*Remove en passant captured pawn (we won't later).*/
if(dest == board->en_passant) RemovePiece(board, dest + ROW_DOWN);
board->en_passant = INVALID_SQ;
}
}
board->rev_plies[board->ply] = 0;
}
static inline void MoveBlackPawn(BOARD *board, SQUARE orig, SQUARE dest, const MOVE *curr_move)
{
PIECE promoted = PROMMASK(*curr_move);
if(ROW(dest) == FIRST_ROW){
DropPiece(board, dest, TURN_BLACK(promoted));
board->en_passant = INVALID_SQ;
}else{
DropPiece(board, dest, B_PAWN);
if(ROW(dest) == FIFTH_ROW && ROW(orig) == SEVENTH_ROW){
board->en_passant = dest + ROW_UP;
}else{
if(dest == board->en_passant) RemovePiece(board, dest + ROW_UP);
board->en_passant = INVALID_SQ;
}
}
board->rev_plies[board->ply] = 0;
}
static inline void MoveWhiteKing(BOARD *board, SQUARE orig, SQUARE dest, MOVE *curr_move)
{
DropPiece(board, dest, W_KING);
board->wking_pos = dest;
if(orig == e1){
if(dest == g1){ /*Short castle*/
RemovePiece(board, h1);
DropPiece(board, f1, W_ROOK);
board->w_castled = 1;
}
if(dest == c1){ /*Long castle*/
RemovePiece(board, a1);
DropPiece(board, d1, W_ROOK);
board->w_castled = 1;
}
if(board->wq_castle) RememberCastleRight(curr_move, Q_CASTLE_RIGHT);
if(board->wk_castle) RememberCastleRight(curr_move, K_CASTLE_RIGHT);
}
board->wk_castle = 0, board->wq_castle = 0;
board->en_passant = INVALID_SQ;
}
static inline void MoveBlackKing(BOARD *board, SQUARE orig, SQUARE dest, MOVE *curr_move)
{
DropPiece(board, dest, B_KING);
board->bking_pos = dest;
if(orig == e8){
if(dest == g8){
RemovePiece(board, h8);
DropPiece(board, f8, B_ROOK);
board->b_castled = 1;
}
if(dest == c8){
RemovePiece(board, a8);
DropPiece(board, d8, B_ROOK);
board->b_castled = 1;
}
if(board->bq_castle) RememberCastleRight(curr_move, Q_CASTLE_RIGHT);
if(board->bk_castle) RememberCastleRight(curr_move, K_CASTLE_RIGHT);
}
board->bk_castle = 0, board->bq_castle = 0;
board->en_passant = INVALID_SQ;
}
static inline void MoveWhiteRook(BOARD *board, SQUARE orig, SQUARE dest, MOVE *curr_move)
{
if(board->wq_castle && orig == a1) {
RememberCastleRight(curr_move, Q_CASTLE_RIGHT);
board->wq_castle = 0;
}
if(board->wk_castle && orig == h1) {
RememberCastleRight(curr_move, K_CASTLE_RIGHT);
board->wk_castle = 0;
}
DropPiece(board, dest, W_ROOK);
board->en_passant = INVALID_SQ;
}
static inline void MoveBlackRook(BOARD *board, SQUARE orig, SQUARE dest, MOVE *curr_move)
{
if(board->bq_castle && orig == a8) {
RememberCastleRight(curr_move, Q_CASTLE_RIGHT);
board->bq_castle = 0;
}
if(board->bk_castle && orig == h8) {
RememberCastleRight(curr_move, K_CASTLE_RIGHT);
board->bk_castle = 0;
}
DropPiece(board, dest, B_ROOK);
board->en_passant = INVALID_SQ;
}
/*
'MakeMove()' modifies curr_move to update information depending on the position (captured, castle, EP...).
'MakeMove()' does NOT verify legality!
*/
void MakeMove(BOARD *board, MOVE *curr_move)
{
board->ply++;
SQUARE orig = ORIGMASK(*curr_move);
SQUARE dest = DESTMASK(*curr_move);
RememberEP(curr_move, board->en_passant);
/*don't update 'castle rights' or 'en passant' board->zobrist_key; useless?*/
/*if(IN_BOARD(board->en_passant)) board->zobrist_key ^= zobkeys.zob_enpass[board->en_passant];*/
if(board->squares[dest]){
RememberCaptured(curr_move, board->squares[dest]);
RemovePiece(board, dest);
board->rev_plies[board->ply] = 0;
}else{
board->rev_plies[board->ply] = board->rev_plies[board->ply-1]+1;
}
switch (board->squares[orig]){
case W_PAWN:
MoveWhitePawn(board, orig, dest, curr_move);
break;
case B_PAWN:
MoveBlackPawn(board, orig, dest, curr_move);
break;
case W_KING:
MoveWhiteKing(board, orig, dest, curr_move);
break;
case B_KING:
MoveBlackKing(board, orig, dest, curr_move);
break;
case W_ROOK:
MoveWhiteRook(board, orig, dest, curr_move);
break;
case B_ROOK:
MoveBlackRook(board, orig, dest, curr_move);
break;
default:
DropPiece(board, dest, board->squares[orig]);
board->en_passant = INVALID_SQ;
break;
}
RemovePiece(board, orig);
/*if(IN_BOARD(board->en_passant)) board->zobrist_key ^= zobkeys.zob_enpass[board->en_passant];*/
board->white_to_move = !(board->white_to_move);
board->zobrist_key ^= zobkeys.zob_side;
board->zobrist_history[board->ply] = board->zobrist_key;
}
/**************************************************************************************
Takebacks.
***************************************************************************************/
static inline void TakebackWhiteKing(BOARD *board, SQUARE orig, SQUARE dest, PIECE promoted)
{
DropPiece(board, orig, W_KING);
board->wking_pos = orig;
if(orig == e1){
if(dest == g1){ /*short castle.*/
RemovePiece(board, f1);
DropPiece(board, h1, W_ROOK);
board->wk_castle = 1;
board->w_castled = 0;
}else if(dest == c1){ /*Long castle.*/
RemovePiece(board, d1);
DropPiece(board, a1, W_ROOK);
board->wq_castle = 1;
board->w_castled = 0;
}
if(promoted == Q_CASTLE_RIGHT || promoted == BOTH_CASTLES){
board->wq_castle = 1;
}
if(promoted == K_CASTLE_RIGHT || promoted == BOTH_CASTLES){
board->wk_castle = 1;
}
}
}
static inline void TakebackBlackKing(BOARD *board, SQUARE orig, SQUARE dest, PIECE promoted)
{
DropPiece(board, orig, B_KING);
board->bking_pos = orig;
if(orig == e8){
if(dest == g8){
RemovePiece(board, f8);
DropPiece(board, h8, B_ROOK);
board->bk_castle = 1;
board->b_castled = 0;
}else if(dest == c8){
RemovePiece(board, d8);
DropPiece(board, a8, B_ROOK);
board->bq_castle = 1;
board->b_castled = 0;
}
if(promoted == Q_CASTLE_RIGHT || promoted == BOTH_CASTLES){
board->bq_castle = 1;
}
if(promoted == K_CASTLE_RIGHT || promoted == BOTH_CASTLES){
board->bk_castle = 1;
}
}
}
static inline void TakebackWhiteRook(BOARD *board, SQUARE orig, SQUARE dest, PIECE promoted)
{
if(promoted){
if(promoted == Q_CASTLE_RIGHT){
board->wq_castle = 1;
DropPiece(board, orig, W_ROOK);
}else if(promoted == K_CASTLE_RIGHT){
board->wk_castle = 1;
DropPiece(board, orig, W_ROOK);
}else{
DropPiece(board, orig, W_PAWN);
}
}else{
DropPiece(board, orig, W_ROOK);
}
}
static inline void TakebackBlackRook(BOARD *board, SQUARE orig, SQUARE dest, PIECE promoted)
{
if(promoted){
if(promoted == Q_CASTLE_RIGHT){
board->bq_castle = 1;
DropPiece(board, orig, B_ROOK);
}else if(promoted == K_CASTLE_RIGHT){
board->bk_castle = 1;
DropPiece(board, orig, B_ROOK);
}else{
DropPiece(board, orig, B_PAWN);
}
}else{
DropPiece(board, orig, B_ROOK);
}
}
void Takeback(BOARD *board, const MOVE prev_move)
{
SQUARE orig = ORIGMASK(prev_move);
SQUARE dest = DESTMASK(prev_move);
PIECE promoted = PROMMASK(prev_move);
PIECE captured = CAPTMASK(prev_move);
/*if(IN_BOARD(board->en_passant)) board->zobrist_key ^= zobkeys.zob_enpass[board->en_passant];*/
board->en_passant = EPMASK(prev_move);
/*if(IN_BOARD(board->en_passant)) board->zobrist_key ^= zobkeys.zob_enpass[board->en_passant];*/
board->white_to_move = !(board->white_to_move);
board->zobrist_key ^= zobkeys.zob_side;
switch(board->squares[dest]){
case W_PAWN:
if(dest == board->en_passant) DropPiece(board, dest + ROW_DOWN, B_PAWN);
DropPiece(board, orig, W_PAWN);
break;
case B_PAWN:
if(dest == board->en_passant) DropPiece(board, dest + ROW_UP, W_PAWN);
DropPiece(board, orig, B_PAWN);
break;
case W_KING:
TakebackWhiteKing(board, orig, dest, promoted);
break;
case B_KING:
TakebackBlackKing(board, orig, dest, promoted);
break;
case W_ROOK:
TakebackWhiteRook(board, orig, dest, promoted);
break;
case B_ROOK:
TakebackBlackRook(board, orig, dest, promoted);
break;
default:
if(promoted){
/*drop a PAWN, same color as the piece's on dest.*/
DropPiece(board, orig, (GET_COLOR(board->squares[dest]) ? W_PAWN : B_PAWN));
}else{
DropPiece(board, orig, board->squares[dest]);
}
break;
}
RemovePiece(board, dest);
if(captured) DropPiece(board, dest, captured);
board->ply--;
}