Massive stronger/weaker renming

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index e56b2c7f60e4839843cdd95ff04219e2c86b4d53..36a89d835411bcca9d797e3265a1a66b7fcf7590 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -143,6 +143,9 @@ void Search::init() {
 
       if (Reductions[0][0][hd][mc] > 2 * ONE_PLY)
           Reductions[0][0][hd][mc] += ONE_PLY;
+
+      else if (Reductions[0][0][hd][mc] > 1 * ONE_PLY)
+          Reductions[0][0][hd][mc] += ONE_PLY / 2;
   }
 
   // Init futility margins array
@@ -1188,6 +1191,11 @@ moves_loop: // When in check and at SpNode search starts from here
             if (  (ss->staticEval = bestValue = tte->eval_value()) == VALUE_NONE
                 ||(ss->evalMargin = tte->eval_margin()) == VALUE_NONE)
                 ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
+
+            // Can ttValue be used as a better position evaluation?
+            if (ttValue != VALUE_NONE)
+                if (tte->bound() & (ttValue > bestValue ? BOUND_LOWER : BOUND_UPPER))
+                    bestValue = ttValue;
         }
         else
             ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
@@ -1205,7 +1213,7 @@ moves_loop: // When in check and at SpNode search starts from here
         if (PvNode && bestValue > alpha)
             alpha = bestValue;
 
-        futilityBase = ss->staticEval + ss->evalMargin + Value(128);
+        futilityBase = bestValue + ss->evalMargin + Value(128);
     }
 
     // Initialize a MovePicker object for the current position, and prepare