Futility pruning till ply 6 included

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 6f0ddea4e8671209dce93d5f7969dd844a03ef56..768a22a4d36b50ce919248e7c0dc4cc95fe286c8 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1035,7 +1035,7 @@ namespace {
         else
             value = alpha + 1; // Just to trigger next condition
 
-        if (value > alpha) // Go with full depth pv search
+        if (value > alpha) // Go with full depth non-pv search
         {
             ss[ply].reduction = Depth(0);
             value = -search(pos, ss, -alpha, newDepth, ply+1, true, threadID);
@@ -1314,12 +1314,14 @@ namespace {
               continue;
 
           // Value based pruning
-          if (depth < 6 * OnePly && approximateEval < beta)
+          if (depth < 7 * OnePly && approximateEval < beta)
           {
               if (futilityValue == VALUE_NONE)
                   futilityValue =  evaluate(pos, ei, threadID)
-                                + (depth < 2 * OnePly ? FutilityMargin1
-                                                      : FutilityMargin2 + (depth - 2*OnePly) * 32);
+                                + (depth < 2 * OnePly ? FutilityMargin1 :
+                                + (depth < 6 * OnePly ? FutilityMargin2 + (depth - 2*OnePly) * 32
+                                                      : FutilityMargin2 + (depth - 2*OnePly) * 64));
+
               if (futilityValue < beta)
               {
                   if (futilityValue > bestValue)