fix regression

Author: winapiadmin

search.cpp

@@ -69,7 +69,7 @@ Value doSearch(Board &board, int depth, Value alpha, Value beta,
   uint64_t hash = board.hash();
   Move preferred = Move::none();
   if (TTEntry *entry = search::tt.lookup(hash)) {
-    if (entry->getDepth() >= depth && ply != 0) {
+    if (entry->getDepth() >= depth) {
       Value ttScore = entry->getScore();
       TTFlag flag = entry->getFlag();
 

tt.cpp

@@ -68,7 +68,8 @@ TTEntry *TranspositionTable::lookup(uint64_t hash) {
   TTEntry &e0 = table[index], &e1 = table[index + 1];
   // Check the entries
   for (TTEntry *e : {&e0, &e1}) {
-    if (e->key == hash)
+    if (e->key == hash &&
+    e->getGeneration() == this->time)
       return e;
   }
   return nullptr;