Improve only on tt mate

official-pikafish · Nov 10, 2024 · 48130f2 · 48130f2
1 parent 56a8f62
commit 48130f2
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -583,7 +583,7 @@ Value Search::Worker::search(
     excludedMove                   = ss->excludedMove;
     posKey                         = pos.key();
     auto [ttHit, ttData, ttWriter] = tt.probe(posKey);
-    ttHit &= tt.stable(pos);
+    ttHit &= std::abs(ttData.value) < VALUE_MATE_IN_MAX_PLY || tt.stable(pos);
     // Need further processing of the saved data
     ss->ttHit    = ttHit;
     ttData.move  = rootNode ? thisThread->rootMoves[thisThread->pvIdx].pv[0]
@@ -1423,7 +1423,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
     // Step 3. Transposition table lookup
     posKey                         = pos.key();
     auto [ttHit, ttData, ttWriter] = tt.probe(posKey);
-    ttHit &= tt.stable(pos);
+    ttHit &= std::abs(ttData.value) < VALUE_MATE_IN_MAX_PLY || tt.stable(pos);
     // Need further processing of the saved data
     ss->ttHit    = ttHit;
     ttData.move  = ttHit ? ttData.move : Move::none();

diff --git a/src/tt.cpp b/src/tt.cpp
@@ -228,6 +228,7 @@ uint8_t TranspositionTable::generation() const { return generation8; }
 // minus 8 times its relative age. TTEntry t1 is considered more valuable than
 // TTEntry t2 if its replace value is greater than that of t2.
 std::tuple<bool, TTData, TTWriter> TranspositionTable::probe(const Key key) const {
+
     TTEntry* const tte   = first_entry(key);
     const uint16_t key16 = uint16_t(key);  // Use the low 16 bits as key inside the cluster