Increase NMP margin for slow variants

makruk STC
LLR: 2.98 (-2.94,2.94) [0.00,10.00]
Total: 1864 W: 182 L: 118 D: 1564
http://www.variantfishtest.org:6543/tests/view/5f8e86a46e23db221d9e9312

makruk LTC
LLR: 2.99 (-2.94,2.94) [0.00,10.00]
Total: 1277 W: 108 L: 49 D: 1120
http://www.variantfishtest.org:6543/tests/view/5f92a9756e23db221d9e9356

shatranj STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 1688 W: 195 L: 130 D: 1363
http://www.variantfishtest.org:6543/tests/view/5f8dfcbf6e23db221d9e9306

shatranj LTC
LLR: 3.53 (-2.94,2.94) [0.00,10.00]
Total: 1293 W: 134 L: 63 D: 1096
http://www.variantfishtest.org:6543/tests/view/5f912df66e23db221d9e9335

losalamos STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 2926 W: 731 L: 634 D: 1561
http://www.variantfishtest.org:6543/tests/view/5f8fd6d06e23db221d9e9322

diff --git a/src/search.cpp b/src/search.cpp
index d0b74fa..41809c8 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -893,7 +893,7 @@ namespace {
         && (ss-1)->statScore < 22977
         &&  eval >= beta
         &&  eval >= ss->staticEval
-        &&  ss->staticEval >= beta - 30 * depth - 28 * improving + 84 * ss->ttPv + 182
+        &&  ss->staticEval >= beta - 30 * depth - 28 * improving + 84 * ss->ttPv + 182 + 200 * (!pos.double_step_enabled() && pos.piece_to_char()[PAWN] != ' ')
         && !excludedMove
         &&  pos.non_pawn_material(us)
         &&  pos.count<ALL_PIECES>(~us) != pos.count<PAWN>(~us)