bool board_is_stalemate(const board_t * board) {
ASSERT(board_is_ok(board));
if (board_is_check(board)) return false;
if (board_can_play(board)) return false;
return true;
}
static void send_board(int extra_move) {
char fen[256];
int start, end;
board_t board[1];
int pos;
int move;
char string[256];
ASSERT(extra_move==MoveNone||move_is_ok(extra_move));
ASSERT(!Uci->searching);
// init
game_get_board(Game,Uci->board);
if (extra_move != MoveNone) move_do(Uci->board,extra_move);
board_to_fen(Uci->board,fen,256);
my_log("POLYGLOT FEN %s\n",fen);
ASSERT(board_can_play(Uci->board));
// more init
start = 0;
end = game_pos(Game);
ASSERT(end>=start);
// position
game_get_board(Game,board,start);
board_to_fen(board,string,256);
engine_send_queue(Engine,"position");
if (my_string_equal(string,StartFen)) {
engine_send_queue(Engine," startpos");
} else {
engine_send_queue(Engine," fen %s",string);
}
// move list
if (end > start || extra_move != MoveNone) engine_send_queue(Engine," moves");
for (pos = start; pos < end; pos++) { // game moves
move = game_move(Game,pos);
move_to_can(move,board,string,256);
engine_send_queue(Engine," %s",string);
move_do(board,move);
}
if (extra_move != MoveNone) { // move to ponder on
move_to_can(extra_move,board,string,256);
engine_send_queue(Engine," %s",string);
}
// end
engine_send(Engine,""); // newline
}
static int game_comp_status(const game_t * game) {
int i, n;
int wb, bb;
const board_t * board;
uint64 key;
int start;
ASSERT(game!=NULL);
// init
board = game->board;
// mate and stalemate
if (!board_can_play(board)) {
if (false) {
} else if (is_in_check(board,Black)) { // HACK
return WHITE_MATES;
} else if (is_in_check(board,White)) { // HACK
return BLACK_MATES;
} else {
return STALEMATE;
}
}
// insufficient material
if (board->number[WhitePawn12] == 0
&& board->number[BlackPawn12] == 0
&& board->number[WhiteQueen12] == 0
&& board->number[BlackQueen12] == 0
&& board->number[WhiteRook12] == 0
&& board->number[BlackRook12] == 0) {
if (board->number[WhiteBishop12]
+ board->number[BlackBishop12]
+ board->number[WhiteKnight12]
+ board->number[BlackKnight12] <= 1) { // KK, KBK and KNK
return DRAW_MATERIAL;
} else if (board->number[WhiteBishop12] == 1
&& board->number[BlackBishop12] == 1
&& board->number[WhiteKnight12] == 0
&& board->number[BlackKnight12] == 0) {
wb = board->list[White][1]; // HACK
bb = board->list[Black][1]; // HACK
if (square_colour(wb) == square_colour(bb)) { // KBKB
return DRAW_MATERIAL;
}
}
}
// 50-move rule
if (board->ply_nb >= 100) return DRAW_FIFTY;
// position repetition
key = board->key;
n = 0;
start = game->pos - board->ply_nb;
if (start < 0) start = 0;
for (i = game->pos-4; i >= start; i -= 2) {
if (game->key[i] == key) {
if (++n == 2) return DRAW_REPETITION;
}
}
return PLAYING;
}
