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movegen: don't separate promotions, perft: loop uses next_legal()

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Bruno Raoult
2024-03-27 12:52:39 +01:00
parent 9b2f5ff751
commit 65fe74c9c5
2 changed files with 52 additions and 76 deletions
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89
src/move-gen.c
View File

@@ -192,7 +192,6 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
bitboard_t movebits, from_pawns;
bitboard_t tmp1, tmp2;
move_t *moves = movelist->move;
int *nmoves = &movelist->nmoves;
int from, to;
@@ -223,7 +222,6 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
}
}
bit_for_each64(from, tmp1, pos->bb[us][ROOK] | pos->bb[us][QUEEN]) {
// printf("rook=%d/%s\n", from, sq_to_string(from));
movebits = hyperbola_rook_moves(occ, from) & not_my_pieces;
bit_for_each64(to, tmp2, movebits & empty) {
moves[(*nmoves)++] = move_make(from, to);
@@ -245,16 +243,23 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
}
/* pawn: relative rank and files */
bitboard_t rel_rank7 = bb_rel_rank(RANK_7, us);
bitboard_t rel_rank8 = bb_rel_rank(RANK_8, us);
bitboard_t rel_rank3 = bb_rel_rank(RANK_3, us);
/* pawn: ranks 2-6 push 1 and 2 squares */
movebits = pawn_shift_up(pos->bb[us][PAWN] & ~rel_rank7, us) & empty;
bit_for_each64(to, tmp1, movebits) {
movebits = pawn_shift_up(pos->bb[us][PAWN], us) & empty;
bit_for_each64(to, tmp1, movebits & ~rel_rank8) {
from = pawn_push_up(to, them); /* reverse push */
//printf("push %d->%d %s->%s", from, to, sq_to_string(from), sq_to_string(to));
moves[(*nmoves)++] = move_make(from, to);
}
bit_for_each64(to, tmp1, movebits & rel_rank8) { /* promotions */
from = pawn_push_up(to, them); /* reverse push */
moves[(*nmoves)++] = move_make_promote(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote(from, to, KNIGHT);
}
/* possible second push */
movebits = pawn_shift_up(movebits & rel_rank3, us) & empty;
bit_for_each64(to, tmp1, movebits) {
@@ -262,20 +267,33 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
moves[(*nmoves)++] = move_make_flags(from, to, M_DPUSH);
}
/* pawn: ranks 2-6 captures left */
from_pawns = pos->bb[us][PAWN] & ~rel_rank7; // & ~rel_filea;
movebits = pawn_shift_upleft(from_pawns, us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits) {
/* pawn: captures left */
movebits = pawn_shift_upleft(pos->bb[us][PAWN], us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits & ~rel_rank8) {
from = pawn_push_upleft(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_capture(from, to);
}
/* pawn: ranks 2-6 captures right */
from_pawns = pos->bb[us][PAWN] & ~rel_rank7; // & ~rel_fileh;
movebits = pawn_shift_upright(from_pawns, us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits) {
from = pawn_push_upright(to, them);
bit_for_each64(to, tmp1, movebits & rel_rank8) {
from = pawn_push_upleft(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_promote_capture(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote_capture(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote_capture(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote_capture(from, to, KNIGHT);
}
/* pawn: captures right */
movebits = pawn_shift_upright(pos->bb[us][PAWN], us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits & ~rel_rank8) {
from = pawn_push_upright(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_capture(from, to);
}
bit_for_each64(to, tmp1, movebits & rel_rank8) {
from = pawn_push_upright(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_promote_capture(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote_capture(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote_capture(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote_capture(from, to, KNIGHT);
}
/* pawn: en-passant */
if ((to = pos->en_passant) != SQUARE_NONE) {
@@ -287,36 +305,6 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
}
}
/* pawn: rank 7 push */
movebits = pawn_shift_up(pos->bb[us][PAWN] & rel_rank7, us) & empty;
bit_for_each64(to, tmp1, movebits) {
from = pawn_push_up(to, them); /* reverse push */
moves[(*nmoves)++] = move_make_promote(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote(from, to, KNIGHT);
}
/* pawn promotion: rank 7 captures left */
from_pawns = pos->bb[us][PAWN] & rel_rank7; // & ~rel_filea;
movebits = pawn_shift_upleft(from_pawns, us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits) {
from = pawn_push_upleft(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_promote_capture(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote_capture(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote_capture(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote_capture(from, to, KNIGHT);
}
/* pawn: rank 7 captures right */
from_pawns = pos->bb[us][PAWN] & rel_rank7; // & ~rel_fileh;
movebits = pawn_shift_upright(from_pawns, us) & enemy_pieces;
bit_for_each64(to, tmp1, movebits) {
from = pawn_push_upright(to, them); /* reverse capture */
moves[(*nmoves)++] = move_make_promote_capture(from, to, QUEEN);
moves[(*nmoves)++] = move_make_promote_capture(from, to, ROOK);
moves[(*nmoves)++] = move_make_promote_capture(from, to, BISHOP);
moves[(*nmoves)++] = move_make_promote_capture(from, to, KNIGHT);
}
/* castle - Attention ! Castling flags are assumed correct
*/
if (!pos->checkers) {
@@ -342,16 +330,7 @@ int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
}
}
}
/* TODO
* DONE. pawn ranks 2-6 advance (1 push, + 2 squares for rank 2)
* DONE. pawns rank 7 advance + promotions
* DONE. pawns ranks 2-6 captures, left and right
* DONE. pawns en-passant (with capture)
* DONE. pawns rank 7 capture + promotion
* DONE. castle
*
* add function per piece, and type, for easier debug
*
/* TODO: add function per piece, and type, for easier debug
*/
return *nmoves;
}

39
src/search.c
View File

@@ -37,33 +37,31 @@
*/
u64 perft(pos_t *pos, int depth, int ply)
{
int subnodes, nmove = 0;
int subnodes, movetmp = 0;
u64 nodes = 0;
movelist_t pseudo = { .nmoves = 0 }, legal = { .nmoves = 0 };
movelist_t pseudo = { .nmoves = 0 };
move_t move;
state_t state;
if (depth == 0)
return 1;
pos->checkers = pos_checkers(pos, pos->turn);
pos_set_pinners_blockers(pos);
state = pos->state;
pos_gen_pseudomoves(pos, &pseudo);
pos_all_legal(pos, &pseudo, &legal);
for (nmove = 0; nmove < legal.nmoves; ++nmove ) {
//while ((move = pos_next_legal(pos, &pseudo, &movetmp)) != MOVE_NONE) {
//printf("depth=%d movetmp=%d\n", depth, movetmp);
state_t state;
move = legal.move[nmove];
move_do(pos, move, &state);
while ((move = pos_next_legal(pos, &pseudo, &movetmp)) != MOVE_NONE) {
move_do(pos, move);
subnodes = perft(pos, depth - 1, ply + 1);
if (ply == 1) {
char movestr[8];
printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
}
nodes += subnodes;
move_undo(pos, move, &state);
move_undo(pos, move);
pos->state = state;
}
if (ply == 1)
printf("\nTotal: %lu\n", nodes);
return nodes;
@@ -75,32 +73,31 @@ u64 perft2(pos_t *pos, int depth, int ply)
u64 nodes = 0;
movelist_t pseudo = { .nmoves = 0 };
move_t move;
state_t state;
if (is_in_check(pos, OPPONENT(pos->turn)))
return 0;
if (depth == 0)
return 1;
pos->checkers = pos_checkers(pos, pos->turn);
pos->pinners = pos_king_pinners(pos, pos->turn);
pos->blockers = pos_king_blockers(pos, pos->turn, pos->pinners);
pos_set_pinners_blockers(pos);
state = pos->state;
pos_gen_pseudomoves(pos, &pseudo);
//pos_all_legal(pos, &pseudo, &legal);
for (nmove = 0; nmove < pseudo.nmoves; ++nmove ) {
//while ((move = pos_next_legal(pos, &pseudo, &movetmp)) != MOVE_NONE) {
//printf("depth=%d movetmp=%d\n", depth, movetmp);
state_t state;
move = pseudo.move[nmove];
move_do(pos, move, &state);
move_do(pos, move);
//if (!is_in_check(pos, OPPONENT(pos->turn))) {
subnodes = perft2(pos, depth - 1, ply + 1);
nodes += subnodes;
if (ply == 1) {
char movestr[8];
printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
}
nodes += subnodes;
move_undo(pos, move, &state);
//}
move_undo(pos, move);
pos->state = state;
}
if (ply == 1)
printf("\nTotal: %lu\n", nodes);