Decrease NMP reduction for racing kings

racingkings STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 17973 W: 5768 L: 5471 D: 6734
http://www.variantfishtest.org:6543/tests/view/5ff074b96e23db221d9e9841

racingkings LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 14105 W: 4073 L: 3838 D: 6194
http://www.variantfishtest.org:6543/tests/view/5ff9b9186e23db3b42517580

diff --git a/src/search.cpp b/src/search.cpp
index 39a1b94..776bd84 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -943,7 +943,7 @@ namespace {
         assert(eval - beta >= 0);
 
         // Null move dynamic reduction based on depth and value
-        Depth R = (1015 - 300 * pos.must_capture() - 150 * !pos.checking_permitted() + 85 * depth) / 256 + std::min(int(eval - beta) / 191, 3);
+        Depth R = (1015 - 300 * pos.must_capture() - 250 * !pos.checking_permitted() + 85 * depth) / 256 + std::min(int(eval - beta) / 191, 3);
 
         ss->currentMove = MOVE_NULL;
         ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];