Make use of asymmetric SEE

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 60667c8764e32a01f904477e66ad614b57b73b57..ab34673463c57286d7ec4047a46755d6fc24701e 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1228,7 +1228,7 @@ split_point_start: // At split points actual search starts from here
           // Prune moves with negative or equal SEE
           if (   futilityBase < beta
               && depth < DEPTH_ZERO
           // Prune moves with negative or equal SEE
           if (   futilityBase < beta
               && depth < DEPTH_ZERO

-              && pos.see(move) <= 0)
+              && pos.see_asymm(move, beta - futilityBase) <= 0)

           {
               bestValue = std::max(bestValue, futilityBase);
               continue;
           {
               bestValue = std::max(bestValue, futilityBase);
               continue;