diff --git a/src/search.cpp b/src/search.cpp index 3d755586..aa63fcb4 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -582,6 +582,10 @@ namespace { && abs(beta) < VALUE_MATE_IN_MAX_PLY && !pos.pawn_on_7th(pos.side_to_move())) { + if ( depth <= ONE_PLY + && eval + razor_margin(3 * ONE_PLY) <= alpha) + return qsearch(pos, ss, alpha, beta, DEPTH_ZERO); + Value ralpha = alpha - razor_margin(depth); Value v = qsearch(pos, ss, ralpha, ralpha+1, DEPTH_ZERO); if (v <= ralpha)