diff --git a/src/search.cpp b/src/search.cpp index 28cbffd6..f8535a5f 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -1113,7 +1113,7 @@ moves_loop: // When in check, search starts from here // castling moves, because they are coded as "king captures rook" and // hence break make_move(). (~5 Elo) else if ( type_of(move) == NORMAL - && !pos.see_ge(make_move(to_sq(move), from_sq(move)))) + && !pos.see_ge(reverse_move(move))) r -= 2 * ONE_PLY; ss->statScore = thisThread->mainHistory[us][from_to(move)] @@ -1603,6 +1603,9 @@ moves_loop: // When in check, search starts from here thisThread->mainHistory[us][from_to(move)] << bonus; update_continuation_histories(ss, pos.moved_piece(move), to_sq(move), bonus); + if (type_of(pos.moved_piece(move)) != PAWN) + thisThread->mainHistory[us][from_to(reverse_move(move))] << -bonus; + if (is_ok((ss-1)->currentMove)) { Square prevSq = to_sq((ss-1)->currentMove); diff --git a/src/types.h b/src/types.h index 3559d72b..934f884e 100644 --- a/src/types.h +++ b/src/types.h @@ -442,6 +442,10 @@ constexpr Move make_move(Square from, Square to) { return Move((from << 6) + to); } +constexpr Move reverse_move(Move m) { + return make_move(to_sq(m), from_sq(m)); +} + template constexpr Move make(Square from, Square to, PieceType pt = KNIGHT) { return Move(T + ((pt - KNIGHT) << 12) + (from << 6) + to);