Slow down reductions

[stockfish] / src / tt.cpp

diff --git a/src/tt.cpp b/src/tt.cpp
index 55aad112af3c252d6006265132e8cb657d70d5f6..1b2ae720dbe60a43826e82f457ff5254a1c0fb35 100644 (file)
--- a/src/tt.cpp
+++ b/src/tt.cpp
@@ -55,7 +55,7 @@ TranspositionTable::~TranspositionTable() {
 
 void TranspositionTable::set_size(unsigned mbSize) {
 
-  assert(mbSize >= 4 && mbSize <= 4096);
+  assert(mbSize >= 4 && mbSize <= 2048);
 
   unsigned newSize = 1024;
 
@@ -208,7 +208,9 @@ void TranspositionTable::insert_pv(const Position& pos, Move pv[]) {
 
   for (int i = 0; pv[i] != MOVE_NONE; i++)
   {
-      store(p.get_key(), VALUE_NONE, VALUE_TYPE_NONE, Depth(-127*OnePly), pv[i]);
+      TTEntry *tte = retrieve(p.get_key());
+      if (!tte || tte->move() != pv[i])
+          store(p.get_key(), VALUE_NONE, VALUE_TYPE_NONE, Depth(-127*OnePly), pv[i]);
       p.do_move(pv[i], st);
   }
 }