Simplify promotion move generator

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index f634b2d2d67b97beaf9a67d97f50b709f509cb86..5306bb9a0084b2ee50ae7b4fc83cbd7324ba2bd0 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1132,6 +1132,9 @@ moves_loop: // When in check, search starts from here
       {
           Depth r = reduction(improving, depth, moveCount);
 
+          if (PvNode)
+              r--;
+
           // Decrease reduction if the ttHit running average is large (~0 Elo)
           if (thisThread->ttHitAverage > 537 * TtHitAverageResolution * TtHitAverageWindow / 1024)
               r--;
@@ -1461,7 +1464,7 @@ moves_loop: // When in check, search starts from here
 
     // Initialize a MovePicker object for the current position, and prepare
     // to search the moves. Because the depth is <= 0 here, only captures,
-    // queen and checking knight promotions, and other checks(only if depth >= DEPTH_QS_CHECKS)
+    // queen promotions, and other checks (only if depth >= DEPTH_QS_CHECKS)
     // will be generated.
     MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
                                       &thisThread->captureHistory,