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Simplify futility equation

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This is a functional simplification. The 178 constant for the futility equation
in master can be removed.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 42626 W: 9508 L: 9428 D: 23690
http://tests.stockfishchess.org/tests/view/5d5d4e320ebc5925cf11254e

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 26182 W: 4432 L: 4320 D: 17430
http://tests.stockfishchess.org/tests/view/5d5df70d0ebc5925cf112fee

Closes https://github.com/official-stockfish/Stockfish/pull/2278

Bench: 3985701
This commit is contained in:
protonspring 2019-08-22 08:27:26 -06:00 • committed by Stéphane Nicolet
parent 10d2ebc6ae
commit a016626825
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -64,7 +64,7 @@ namespace {
// Razor and futility margins // Razor and futility margins
constexpr int RazorMargin = 661; constexpr int RazorMargin = 661;
Value futility_margin(Depth d, bool improving) { Value futility_margin(Depth d, bool improving) {
return Value(198 * (d / ONE_PLY) - 178 * improving); return Value(198 * (d / ONE_PLY - improving));
} }
// Reductions lookup table, initialized at startup // Reductions lookup table, initialized at startup