bool move_is_check(int move, board_t * board) {
undo_t undo[1];
bool check;
int me, opp, king;
int from, to, piece;
ASSERT(move_is_ok(move));
ASSERT(board!=NULL);
// slow test for complex moves
if (MOVE_IS_SPECIAL(move)) {
move_do(board,move,undo);
check = IS_IN_CHECK(board,board->turn);
move_undo(board,move,undo);
return check;
}
// init
me = board->turn;
opp = COLOUR_OPP(me);
king = KING_POS(board,opp);
from = MOVE_FROM(move);
to = MOVE_TO(move);
piece = board->square[from];
ASSERT(COLOUR_IS(piece,me));
// direct check
if (PIECE_ATTACK(board,piece,to,king)) return true;
// indirect check
if (is_pinned(board,from,opp)
&& DELTA_INC_LINE(king-to) != DELTA_INC_LINE(king-from)) {
return true;
}
return false;
}
bool move_is_pseudo(int move, board_t * board) {
int me, opp;
int from, to;
int piece, capture;
int inc, delta;
ASSERT(move_is_ok(move));
ASSERT(board!=NULL);
ASSERT(!board_is_check(board));
// special cases
if (MOVE_IS_SPECIAL(move)) {
return move_is_pseudo_debug(move,board);
}
ASSERT((move&~07777)==0);
// init
me = board->turn;
opp = COLOUR_OPP(board->turn);
// from
from = MOVE_FROM(move);
ASSERT(SQUARE_IS_OK(from));
piece = board->square[from];
if (!COLOUR_IS(piece,me)) return false;
ASSERT(piece_is_ok(piece));
// to
to = MOVE_TO(move);
ASSERT(SQUARE_IS_OK(to));
capture = board->square[to];
if (COLOUR_IS(capture,me)) return false;
// move
if (PIECE_IS_PAWN(piece)) {
if (SQUARE_IS_PROMOTE(to)) return false;
inc = PAWN_MOVE_INC(me);
delta = to - from;
ASSERT(delta_is_ok(delta));
if (capture == Empty) {
// pawn push
if (delta == inc) return true;
if (delta == (2*inc)
&& PAWN_RANK(from,me) == Rank2
&& board->square[from+inc] == Empty) {
return true;
}
} else {
// pawn capture
if (delta == (inc-1) || delta == (inc+1)) return true;
}
} else {
if (PIECE_ATTACK(board,piece,from,to)) return true;
}
return false;
}
