Maximum aspiration delta of 24

[stockfish] / src / tt.cpp

diff --git a/src/tt.cpp b/src/tt.cpp
index 63c3e995ab30b22f33191faf22a881350fe19cf9..773f03ccbac463929faf254ec4cb8e591d42c224 100644 (file)
--- a/src/tt.cpp
+++ b/src/tt.cpp
@@ -24,6 +24,7 @@
 
 #include <cassert>
 #include <cstring>
+#include <iostream>
 
 #include "tt.h"
 
@@ -54,18 +55,18 @@ void TranspositionTable::set_size(size_t mbSize) {
 
   size_t newSize = 1024;
 
-  // Transposition table consists of clusters and
-  // each cluster consists of ClusterSize number of TTEntries.
-  // Each non-empty entry contains information of exactly one position.
-  // newSize is the number of clusters we are going to allocate.
-  while ((2 * newSize) * sizeof(TTCluster) <= (mbSize << 20))
+  // Transposition table consists of clusters and each cluster consists
+  // of ClusterSize number of TTEntries. Each non-empty entry contains
+  // information of exactly one position and newSize is the number of
+  // clusters we are going to allocate.
+  while (2ULL * newSize * sizeof(TTCluster) <= (mbSize << 20))
       newSize *= 2;
 
   if (newSize != size)
   {
       size = newSize;
       delete [] entries;
-      entries = new TTCluster[size];
+      entries = new (std::nothrow) TTCluster[size];
       if (!entries)
       {
           std::cerr << "Failed to allocate " << mbSize
@@ -121,7 +122,7 @@ void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d,
           continue;
 
       c1 = (replace->generation() == generation ?  2 : 0);
-      c2 = (tte->generation() == generation ? -2 : 0);
+      c2 = (tte->generation() == generation || tte->type() == VALUE_TYPE_EXACT ? -2 : 0);
       c3 = (tte->depth() < replace->depth() ?  1 : 0);
 
       if (c1 + c2 + c3 > 0)