Double Impact of Gain tables

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index ed029b4c4a08e6d15b3ef28f2b4b246b04ad74d9..5ff23ad0fd894791c7b5e8ac625246c40343e1e5 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -875,7 +875,7 @@ split_point_start: // At split points actual search starts from here
           // but fixing this made program slightly weaker.
           Depth predictedDepth = newDepth - reduction<PvNode>(depth, moveCount);
           futilityValue =  ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)
-                         + Gain[pos.piece_moved(move)][to_sq(move)];
+                         + 2 * Gain[pos.piece_moved(move)][to_sq(move)];
 
           if (futilityValue < beta)
           {