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movedirectory.cpp
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//===========================================================//
//
// Maverick Chess Engine
// Copyright 2013 Steve Maughan
//
//===========================================================//
#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include <process.h>
#include <conio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include "defs.h"
#include "data.h"
#include "procs.h"
#include "bittwiddle.h"
t_move_record *lookup_move(struct t_board *board, char *move_string) {
t_chess_square from_square = name_to_index(move_string);
t_chess_square to_square = name_to_index(move_string + 2);
t_chess_piece piece = board->square[from_square];
t_chess_piece captured = PIECETYPE(board->square[to_square]);
t_chess_color color = COLOR(piece);
t_chess_piece promote_to = 0;
if (PAWN == PIECETYPE(piece) && ((color == WHITE && RANK(to_square) == 7) || (color == BLACK && RANK(to_square) == 0))) {
if (move_string[4] == 'q')
promote_to = QUEEN;
else if (move_string[4] == 'b')
promote_to = BISHOP;
else if (move_string[4] == 'r')
promote_to = ROOK;
else if (move_string[4] == 'n')
promote_to = KNIGHT;
return move_directory[from_square][to_square][piece] + (4 * captured) + promote_to - 1;
}
else
return move_directory[from_square][to_square][piece] + captured;
}
void configure_castling(int *i)
{
struct t_move_record *move = &xmove_list[*i];
// White Kingside
move->captured = BLANK;
move->from_square = E1;
move->to_square = G1;
move->move_type = MOVE_CASTLE;
move->piece = WHITEKING;
move->promote_to = BLANK;
move->castling_delta = (BLACK_CASTLE_OO | BLACK_CASTLE_OOO);
move_directory[move->from_square][move->to_square][move->piece] = move;
move_directory[move->from_square][H1][move->piece] = move;
(*i)++;
move++;
// White Queenside
move->captured = BLANK;
move->from_square = E1;
move->to_square = C1;
move->move_type = MOVE_CASTLE;
move->piece = WHITEKING;
move->promote_to = BLANK;
move->castling_delta = (BLACK_CASTLE_OO | BLACK_CASTLE_OOO);
move_directory[move->from_square][move->to_square][move->piece] = move;
move_directory[move->from_square][A1][move->piece] = move;
(*i)++;
move++;
// Black Kingside
move->captured = BLANK;
move->from_square = E8;
move->to_square = G8;
move->move_type = MOVE_CASTLE;
move->piece = BLACKKING;
move->promote_to = BLANK;
move->castling_delta = (WHITE_CASTLE_OO | WHITE_CASTLE_OOO);
move_directory[move->from_square][move->to_square][move->piece] = move;
move_directory[move->from_square][H8][move->piece] = move;
(*i)++;
move++;
// Black Queenside
move->captured = BLANK;
move->from_square = E8;
move->to_square = C8;
move->move_type = MOVE_CASTLE;
move->piece = BLACKKING;
move->promote_to = BLANK;
move->castling_delta = (WHITE_CASTLE_OO | WHITE_CASTLE_OOO);
move_directory[move->from_square][move->to_square][move->piece] = move;
move_directory[move->from_square][A8][move->piece] = move;
(*i)++;
move++;
}
void configure_pawn_push(int *i)
{
int s;
t_chess_piece promote;
struct t_move_record *move = &xmove_list[*i];
// White double pawn push
for (s = A2; s <= H2; s++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s + 16;
move->move_type = MOVE_PAWN_PUSH2;
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
// White non-promoting pawn push
for (s = A2; s <= H6; s++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s + 8;
move->move_type = MOVE_PAWN_PUSH1;
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
// White promotions
for (s = A7; s <= H7; s++) {
move_directory[s][s + 8][WHITEPAWN] = move;
for (promote = WHITEKNIGHT; promote <= WHITEQUEEN; promote++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s + 8;
move->move_type = MOVE_PROMOTION;
move->piece = WHITEPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
// Black non-promoting pawn push
for (s = A7; s <= H7; s++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s - 16;
move->move_type = MOVE_PAWN_PUSH2;
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
// Black non-promoting pawn push
for (s = A3; s <= H7; s++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s - 8;
move->move_type = MOVE_PAWN_PUSH1;
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
// Black pawn promotions
for (s = A2; s <= H2; s++) {
move_directory[s][s - 8][BLACKPAWN] = move;
for (promote = BLACKKNIGHT; promote <= BLACKQUEEN; promote++) {
move->captured = BLANK;
move->from_square = s;
move->to_square = s - 8;
move->move_type = MOVE_PROMOTION;
move->piece = BLACKPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
}
void configure_pawn_capture(int *i)
{
int s;
t_chess_piece promote, capture;
struct t_move_record *move = &xmove_list[*i];
// White non-promoting captures
for (s = A2; s <= H6; s++) {
// North East Capture
if (COLUMN(s) < 7) {
// ep capture
if (RANK(s) == 4) {
move->captured = BLACKPAWN;
move->from_square = s;
move->to_square = s + 9;
move->move_type = MOVE_PxP_EP;
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
for (capture = BLACKKNIGHT; capture <=BLACKPAWN; capture++) {
move->captured = capture;
move->from_square = s;
move->to_square = s + 9;
if (PIECETYPE(capture) == PAWN) {
move->move_type = MOVE_PxPAWN;
}
else {
move->move_type = MOVE_PxPIECE;
}
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move - PIECETYPE(capture);
(*i)++;
move++;
}
}
// North West Capture
if (COLUMN(s) > 0) {
// ep capture
if (RANK(s) == 4) {
move->captured = BLACKPAWN;
move->from_square = s;
move->to_square = s + 7;
move->move_type = MOVE_PxP_EP;
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
for (capture = BLACKKNIGHT; capture <=BLACKPAWN; capture++) {
move->captured = capture;
move->from_square = s;
move->to_square = s + 7;
if (PIECETYPE(capture) == PAWN) {
move->move_type = MOVE_PxPAWN;
}
else {
move->move_type = MOVE_PxPIECE;
}
move->piece = WHITEPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move - PIECETYPE(capture);
(*i)++;
move++;
}
}
}
// White Capture Promotes
for (s = A7; s <= H7; s++) {
if (COLUMN(s) < 7) {
for (capture = BLACKKNIGHT; capture <= BLACKQUEEN; capture++) {
move_directory[s][s + 9][WHITEPAWN] = move - (4 * PIECETYPE(capture));
for (promote = WHITEKNIGHT; promote <= WHITEQUEEN; promote++) {
move->captured = capture;
move->from_square = s;
move->to_square = s + 9;
move->move_type = MOVE_CAPTUREPROMOTE;
move->piece = WHITEPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
}
if (COLUMN(s) > 0) {
for (capture = BLACKKNIGHT; capture <= BLACKQUEEN; capture++) {
move_directory[s][s + 7][WHITEPAWN] = move - (4 * PIECETYPE(capture));
for (promote = WHITEKNIGHT; promote <= WHITEQUEEN; promote++) {
move->captured = capture;
move->from_square = s;
move->to_square = s + 7;
move->move_type = MOVE_CAPTUREPROMOTE;
move->piece = WHITEPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
}
}
// Black non-promoting captures
for (s = A3; s <= H7; s++) {
// South East Capture
if (COLUMN(s) < 7) {
// ep capture
if (RANK(s) == 3) {
move->captured = WHITEPAWN;
move->from_square = s;
move->to_square = s - 7;
move->move_type = MOVE_PxP_EP;
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
for (capture = WHITEKNIGHT; capture <= WHITEPAWN; capture++) {
move->captured = capture;
move->from_square = s;
move->to_square = s - 7;
if (PIECETYPE(capture) == PAWN) {
move->move_type = MOVE_PxPAWN;
}
else {
move->move_type = MOVE_PxPIECE;
}
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move - PIECETYPE(capture);
(*i)++;
move++;
}
}
// North West Capture
if (COLUMN(s) > 0) {
// ep capture
if (RANK(s) == 3) {
move->captured = WHITEPAWN;
move->from_square = s;
move->to_square = s - 9;
move->move_type = MOVE_PxP_EP;
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
}
for (capture = WHITEKNIGHT; capture <= WHITEPAWN; capture++) {
move->captured = capture;
move->from_square = s;
move->to_square = s - 9;
if (PIECETYPE(capture) == PAWN) {
move->move_type = MOVE_PxPAWN;
}
else {
move->move_type = MOVE_PxPIECE;
}
move->piece = BLACKPAWN;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move - PIECETYPE(capture);
(*i)++;
move++;
}
}
}
// Black Capture Promotes
for (s = A2; s <= H2; s++) {
if (COLUMN(s) < 7) {
for (capture = WHITEKNIGHT; capture <= WHITEQUEEN; capture++) {
move_directory[s][s - 7][BLACKPAWN] = move - (4 * PIECETYPE(capture));
for (promote = BLACKKNIGHT; promote <= BLACKQUEEN; promote++) {
move->captured = capture;
move->from_square = s;
move->to_square = s - 7;
move->move_type = MOVE_CAPTUREPROMOTE;
move->piece = BLACKPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
}
if (COLUMN(s) > 0) {
for (capture = WHITEKNIGHT; capture <= WHITEQUEEN; capture++) {
move_directory[s][s - 9][BLACKPAWN] = move - (4 * PIECETYPE(capture));
for (promote = BLACKKNIGHT; promote <= BLACKQUEEN; promote++) {
move->captured = capture;
move->from_square = s;
move->to_square = s - 9;
move->move_type = MOVE_CAPTUREPROMOTE;
move->piece = BLACKPAWN;
move->promote_to = promote;
(*i)++;
move++;
}
}
}
}
}
void configure_piece_moves(int *i)
{
int delta, d;
t_chess_square s, target;
t_chess_color color, opponent;
t_chess_piece p, move_piece, capture;
struct t_move_record *move = &xmove_list[*i];
for (color = WHITE; color <= BLACK; color++) {
opponent = OPPONENT(color);
for (s = A1; s <= H8; s++) {
for (p = KNIGHT; p <= KING; p++) {
if (PIECETYPE(p) != PAWN) {
move_piece = p + (color * 8);
if (slider[p]) {
d = 0;
for (delta = direction[p][d]; (delta = direction[p][d]) != 0; d++) {
target = x88_SQUARE(s) + delta;
while (x88_ONBOARD(target)) {
move->captured = BLANK;
move->from_square = s;
move->to_square = x88_TO_64(target);
move->move_type = MOVE_PIECE_MOVE;
move->piece = move_piece;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
for (capture = KNIGHT; capture <= QUEEN; capture++) {
move->captured = capture + (opponent * 8);
move->from_square = s;
move->to_square = x88_TO_64(target);
move->move_type = MOVE_PIECExPIECE;
move->piece = move_piece;
move->promote_to = BLANK;
(*i)++;
move++;
}
if ((x88_TO_64(target) >= A2) && (x88_TO_64(target) <= H7)) {
move->captured = PAWN + (opponent * 8);
move->from_square = s;
move->to_square = x88_TO_64(target);
move->move_type = MOVE_PIECExPAWN;
move->piece = move_piece;
move->promote_to = BLANK;
(*i)++;
move++;
}
target += delta;
}
}
}
else
{
d = 0;
for (delta = direction[p][d]; (delta = direction[p][d]) != 0; d++) {
target = x88_SQUARE(s) + delta;
if (x88_ONBOARD(target)) {
move->captured = BLANK;
move->from_square = s;
move->to_square = x88_TO_64(target);
if (PIECETYPE(move_piece) == KING)
move->move_type = MOVE_KING_MOVE;
else
move->move_type = MOVE_PIECE_MOVE;
move->piece = move_piece;
move->promote_to = BLANK;
move_directory[move->from_square][move->to_square][move->piece] = move;
(*i)++;
move++;
for (capture = KNIGHT; capture <= QUEEN; capture++) {
move->captured = capture + (opponent * 8);
move->from_square = s;
move->to_square = x88_TO_64(target);
if (PIECETYPE(move_piece) == KING)
move->move_type = MOVE_KINGxPIECE;
else
move->move_type = MOVE_PIECExPIECE;
move->piece = move_piece;
move->promote_to = BLANK;
(*i)++;
move++;
}
if ((x88_TO_64(target) >= A2) && (x88_TO_64(target) <= H7)) {
move->captured = PAWN + (opponent * 8);
move->from_square = s;
move->to_square = x88_TO_64(target);
if (PIECETYPE(move_piece) == KING)
move->move_type = MOVE_KINGxPAWN;
else
move->move_type = MOVE_PIECExPAWN;
move->piece = move_piece;
move->promote_to = BLANK;
(*i)++;
move++;
}
}
}
}
}
}
}
}
}
void init_move_directory()
{
int i, j;
t_chess_square f, t;
t_chess_piece p;
t_chess_color color, opponent;
static char s[64];
struct t_move_record *move;
uchar not_mask;
// initialize the global move lists
for (f = A1; f <= H8; f++) {
for (t = A1; t <= H8; t++) {
for (p = BLANK; p <= BLACKKING; p++) {
move_directory[f][t][p] = NULL;
}
}
}
i = 0;
configure_castling(&i);
configure_pawn_push(&i);
configure_pawn_capture(&i);
configure_piece_moves(&i);
//-- Fill in the data
for (i = 0, move = &xmove_list[0]; i < GLOBAL_MOVE_COUNT; i++, move++) {
move->history = 0;
move->index = i;
move->from_to_bitboard = SQUARE64(move->from_square) | SQUARE64(move->to_square);
// castling mask
move->castling_delta = (WHITE_CASTLE_OO | WHITE_CASTLE_OOO | BLACK_CASTLE_OO | BLACK_CASTLE_OOO);
for (j = 0; j < 4; j++) {
not_mask = (15 ^ ((uchar)1 << j));
if ((move->from_square == castle[j].king_from) | (move->to_square == castle[j].king_from))
move->castling_delta &= not_mask;
if ((move->from_square == castle[j].rook_from) | (move->to_square == castle[j].rook_from))
move->castling_delta &= not_mask;
}
move->capture_mask = 0;
if (move->captured && (move->move_type != MOVE_PxP_EP))
move->capture_mask = SQUARE64(move->to_square);
color = COLOR(move->piece);
opponent = OPPONENT(color);
move->hash_delta = white_to_move_hash;
move->pawn_hash_delta = white_to_move_hash;
if (move->captured)
{
assert(move->piece >= 0 && move->piece < 15);
move->mvvlva = see_piece_value[move->captured] * 100 + (see_piece_value[QUEEN] - see_piece_value[move->piece]);
}
else
{
move->mvvlva = 0;
}
assert(move->piece >= 0 && move->piece < 16);
assert(move->from_square >= 0 && move->from_square < 64);
assert(move->to_square >= 0 && move->to_square < 64);
switch (move->move_type)
{
case MOVE_CASTLE:
j = move->index;
assert( move->index >= 0 && move->index < 4);
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
move->hash_delta ^= hash_value[castle[j].rook_piece][castle[j].rook_from] ^ hash_value[castle[j].rook_piece][castle[j].rook_to];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_PAWN_PUSH1:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_PAWN_PUSH2:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_PxPAWN:
assert(PIECEINDEX(opponent, PAWN) >= 0 && PIECEINDEX(opponent, PAWN) < 64);
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[PIECEINDEX(opponent, PAWN)][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[PIECEINDEX(opponent, PAWN)][move->to_square];
break;
case MOVE_PxPIECE:
assert(move->captured >= 0 && move->captured < 16);
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_PxP_EP:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[PIECEINDEX(opponent, PAWN)][(move->to_square - 8) + 16 * color];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[PIECEINDEX(opponent, PAWN)][(move->to_square - 8) + 16 * color];
break;
case MOVE_PROMOTION:
assert(move->promote_to >= 0 && move->promote_to < 16);
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->promote_to][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square];
break;
case MOVE_CAPTUREPROMOTE:
assert(move->captured >= 0 && move->captured < 16);
assert(move->promote_to >= 0 && move->promote_to < 16);
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->promote_to][move->to_square] ^ hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square];
break;
case MOVE_PIECE_MOVE:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_PIECExPIECE:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[move->captured][move->to_square];
break;
case MOVE_PIECExPAWN:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->captured][move->to_square];
break;
case MOVE_KING_MOVE:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_KINGxPIECE:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
case MOVE_KINGxPAWN:
move->hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square] ^ hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->captured][move->to_square];
move->pawn_hash_delta ^= hash_value[move->piece][move->from_square] ^ hash_value[move->piece][move->to_square];
break;
}
}
}
void clear_history()
{
struct t_move_record *move = &xmove_list[0];
for (int i = 0; i < GLOBAL_MOVE_COUNT; i++, move++) {
move->history = 0;
}
}