From: Vizvezdenec <Vizvezdenec@gmail.com>
Date: Tue, 16 Jul 2019 11:56:52 +0000 (+0300)
Subject: Tweak LMR and killers
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=19509e5f1313e3693a7ee56531326eed3c62a1af;ds=sidebyside

Tweak LMR and killers

Give extra stat bonus/malus in case of LMR for killers.

passed STC
http://tests.stockfishchess.org/tests/view/5d2c8e760ebc5925cf0dcf23
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 67188 W: 15030 L: 14534 D: 37624

passed LTC
http://tests.stockfishchess.org/tests/view/5d2d0ce40ebc5925cf0de115
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 144355 W: 24739 L: 24153 D: 95463

Closes https://github.com/official-stockfish/Stockfish/pull/2246

bench 3723147
---

diff --git a/src/search.cpp b/src/search.cpp
index 2c2321ee..1fc0bf1e 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1144,6 +1144,9 @@ moves_loop: // When in check, search starts from here
               int bonus = value > alpha ?  stat_bonus(newDepth)
                                         : -stat_bonus(newDepth);
 
+              if (move == ss->killers[0])
+              	  bonus += bonus / 4;
+
               update_continuation_histories(ss, movedPiece, to_sq(move), bonus);
           }
       }