bool Mate::isProtected_(const Board& board, const Square to, const Bitboard& occ, const Bitboard& occNoAttacker, const Square king) {
// pawn
Bitboard bb = (black ? board.getBPawn() : board.getWPawn()) & occNoAttacker;
if (bb.check(black ? to.safetyDown() : to.safetyUp())) {
return true;
}
// lance
bb = (black ? board.getBLance() : board.getWLance()) & occNoAttacker;
bb &= black ? MoveTables::wlance(to, occ) : MoveTables::blance(to, occ);
if (bb) { return true; }
// knight
bb = (black ? board.getBKnight() : board.getWKnight()) & occNoAttacker;
bb &= black ? MoveTables::wknight(to) : MoveTables::bknight(to);
if (bb) { return true; }
// silver
bb = (black ? board.getBSilver() : board.getWSilver()) & occNoAttacker;
bb &= black ? MoveTables::wsilver(to) : MoveTables::bsilver(to);
if (bb) { return true; }
// gold
bb = (black ? board.getBGold() : board.getWGold()) & occNoAttacker;
bb &= black ? MoveTables::wgold(to) : MoveTables::bgold(to);
if (bb) { return true; }
// bishop
bb = (black ? board.getBBishop() : board.getWBishop()) & occNoAttacker;
bb &= MoveTables::bishop(to, occ);
if (bb) { return true; }
// rook
bb = (black ? board.getBRook() : board.getWRook()) & occNoAttacker;
bb &= MoveTables::rook(to, occ);
if (bb) { return true; }
// tokin
bb = (black ? board.getBTokin() : board.getWTokin()) & occNoAttacker;
bb &= black ? MoveTables::wgold(to) : MoveTables::bgold(to);
if (bb) { return true; }
// promoted lance
bb = (black ? board.getBProLance() : board.getWProLance()) & occNoAttacker;
bb &= black ? MoveTables::wgold(to) : MoveTables::bgold(to);
if (bb) { return true; }
// promoted knight
bb = (black ? board.getBProKnight() : board.getWProKnight()) & occNoAttacker;
bb &= black ? MoveTables::wgold(to) : MoveTables::bgold(to);
if (bb) { return true; }
// promoted silver
bb = (black ? board.getBProSilver() : board.getWProSilver()) & occNoAttacker;
bb &= black ? MoveTables::wgold(to) : MoveTables::bgold(to);
if (bb) { return true; }
// horse
bb = (black ? board.getBHorse() : board.getWHorse()) & occNoAttacker;
bb &= MoveTables::horse(to, occ);
if (bb) { return true; }
// dragon
bb = (black ? board.getBDragon() : board.getWDragon()) & occNoAttacker;
bb &= MoveTables::dragon(to, occ);
if (bb) { return true; }
// king
if (king.isValid()) {
if (MoveTables::king(king).check(to) &&
(!recursive || !isProtected_<!black>(board, to, occ, occNoAttacker, Square::Invalid))) {
return true;
}
}
return false;
}
