From: protonspring <mike@whiteley.org>
Date: Fri, 31 May 2019 12:35:39 +0000 (-0600)
Subject: Scale lazy threshold according to material. (#2170)
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=3edf0e6b37df9c81ea1a4cd3affd11548547815b;hp=c645587270c2b08d327d290d0ae3c3f5e0a30eee;ds=sidebyside

Scale lazy threshold according to material. (#2170)

STC
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 58543 W: 13238 L: 12782 D: 32523
http://tests.stockfishchess.org/tests/view/5cef3efa0ebc5925cf081f07

LTC
LLR: 3.70 (-2.94,2.94) [0.00,3.50]
Total: 82232 W: 14281 L: 13825 D: 54126
http://tests.stockfishchess.org/tests/view/5cef595d0ebc5925cf082441

bench 3807737
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 86f73563..d211db64 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -74,7 +74,7 @@ using namespace Trace;
 namespace {
 
   // Threshold for lazy and space evaluation
-  constexpr Value LazyThreshold  = Value(1500);
+  constexpr Value LazyThreshold  = Value(1400);
   constexpr Value SpaceThreshold = Value(12222);
 
   // KingAttackWeights[PieceType] contains king attack weights by piece type
@@ -813,7 +813,7 @@ namespace {
 
     // Early exit if score is high
     Value v = (mg_value(score) + eg_value(score)) / 2;
-    if (abs(v) > LazyThreshold)
+    if (abs(v) > (LazyThreshold + pos.non_pawn_material() / 64))
        return pos.side_to_move() == WHITE ? v : -v;
 
     // Main evaluation begins here