Tweak NMP depth for racing kings

racingkings STC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 2269 W: 812 L: 706 D: 751
http://35.161.250.236:6543/tests/view/5c6daf426e23db07348e86e3

racingkings LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 3534 W: 1201 L: 1081 D: 1252
http://35.161.250.236:6543/tests/view/5c6dce286e23db07348e86ec

diff --git a/src/search.cpp b/src/search.cpp
index ac7eddf..9019f37 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -765,7 +765,7 @@ namespace {
         assert(eval - beta >= 0);
 
         // Null move dynamic reduction based on depth and value
-        Depth R = ((823 + 67 * depth / ONE_PLY) / 256 + std::min((eval - beta) / PawnValueMg, 3)) * ONE_PLY;
+        Depth R = ((823 - 150 * !pos.checking_permitted() + 67 * depth / ONE_PLY) / 256 + std::min((eval - beta) / PawnValueMg, 3)) * ONE_PLY;
 
         ss->currentMove = MOVE_NULL;
         ss->continuationHistory = thisThread->continuationHistory[NO_PIECE][0].get();