void
calc_difference(const Position &pos, Move last_move, SearchStack *ss)
{
const Square from = move_from(last_move);
const PieceType type = move_piece_type(last_move);
if (type == kKing)
{
if (pos.side_to_move() == kBlack)
calc_difference_king_move_no_capture<kWhite>(pos, ss);
else
calc_difference_king_move_no_capture<kBlack>(pos, ss);
}
else
{
if (from >= kBoardSquare)
{
calc_no_capture_difference(pos, ss);
}
else
{
const PieceType capture = move_capture(last_move);
if (capture == kPieceNone)
calc_no_capture_difference(pos, ss);
else
calc_difference_capture(pos, ss);
}
}
}
static bool capture_is_dangerous(int move, const board_t * board) {
int piece, capture;
ASSERT(move_is_ok(move));
ASSERT(board!=NULL);
ASSERT(move_is_tactical(move,board));
piece = MOVE_PIECE(move,board);
if (PIECE_IS_PAWN(piece)
&& PAWN_RANK(MOVE_TO(move),board->turn) >= Rank7) {
return true;
}
capture = move_capture(move,board);
if (PIECE_IS_QUEEN(capture)) return true;
if (PIECE_IS_PAWN(capture)
&& PAWN_RANK(MOVE_TO(move),board->turn) <= Rank2) {
return true;
}
return false;
}