Combination of two ideas:

[stockfish] / src / endgame.cpp

diff --git a/src/endgame.cpp b/src/endgame.cpp
index ee6705aaeaa0a157b70f94a06cfc87642d5b8b96..97e7e12ff4f9b93d4bdc5db5c6f282cea05666e5 100644 (file)
--- a/src/endgame.cpp
+++ b/src/endgame.cpp
@@ -601,11 +601,11 @@ ScaleFactor Endgame<KRPPKRP>::operator()(const Position& pos) const {
       && relative_rank(strongSide, bksq) > r)
   {
       switch (r) {
-      case RANK_2: return ScaleFactor(10);
+      case RANK_2: return ScaleFactor(9);
       case RANK_3: return ScaleFactor(10);
-      case RANK_4: return ScaleFactor(15);
-      case RANK_5: return ScaleFactor(20);
-      case RANK_6: return ScaleFactor(40);
+      case RANK_4: return ScaleFactor(14);
+      case RANK_5: return ScaleFactor(21);
+      case RANK_6: return ScaleFactor(44);
       default: assert(false);
       }
   }