X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Ftt.cpp;h=8c5f3e347a5353756868e8a2c0877774015647f6;hb=659c54582ddb1bbbf80f7022a80c027ab0bd4c42;hp=c88aef486e3e6f3a755f0f4daee7f7ab04b6e107;hpb=5a0581498cde3d0904924d8ef7ed25ea1a2c855a;p=stockfish

diff --git a/src/tt.cpp b/src/tt.cpp
index c88aef48..8c5f3e34 100644
--- a/src/tt.cpp
+++ b/src/tt.cpp
@@ -101,7 +101,8 @@ void TranspositionTable::clear() {
 /// the least valuable of the four entries in a cluster.  A TTEntry t1 is
 /// considered to be more valuable than a TTEntry t2 if t1 is from the
 /// current search and t2 is from a previous search, or if the depth of t1
-/// is bigger than the depth of t2.
+/// is bigger than the depth of t2. A TTEntry of type VALUE_TYPE_EVAL
+/// never replaces another entry for the same position.
 
 void TranspositionTable::store(const Position &pos, Value v, Depth d,
                                Move m, ValueType type) {
@@ -112,6 +113,11 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d,
   {
     if (!tte->key() || tte->key() == pos.get_key()) // empty or overwrite old
     {
+        // Do not overwrite position entry when VALUE_TYPE_EVAL
+        if (   tte->key()
+            && type == VALUE_TYPE_EVAL)
+            return;
+
         if (m == MOVE_NONE)
             m = tte->move();
 
@@ -206,5 +212,5 @@ TTEntry::TTEntry() {
 
 TTEntry::TTEntry(Key k, Value v, ValueType t, Depth d, Move m,
                  int generation) :
-  key_ (k), data((m & 0x7FFFF) | (t << 20) | (generation << 23)),
+  key_ (k), data((m & 0x1FFFF) | (t << 20) | (generation << 23)),
   value_(int16_t(v)), depth_(int16_t(d)) {}