Simplify PvNode reduction

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 76d055e3039e3b3a8245eeee9a8520343d75d392..1f8f361c4096a13a411c3eed3ca2b3548e9603e8 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1162,7 +1162,7 @@ moves_loop: // When in check, search starts here
 
       // Decrease reduction for PvNodes based on depth (~2 Elo)
       if (PvNode)
-          r -= 1 + 12 / (3 + depth);
+          r -= 1 + (depth < 6);
 
       // Decrease reduction if ttMove has been singularly extended (~1 Elo)
       if (singularQuietLMR)