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Simplify Stat Score bonus 

This is a functional simplification of this statScore bonus.
There seems to be little risk of regression with this one.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 26829 W: 5892 L: 5781 D: 15156
http://tests.stockfishchess.org/tests/view/5c5086bb0ebc593af5d4db75

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 28232 W: 4684 L: 4575 D: 18973
http://tests.stockfishchess.org/tests/view/5c50d7690ebc593af5d4dec9

Closes https://github.com/official-stockfish/Stockfish/pull/1979

Bench: 4001014
pull/1981/head
protonspring 2019-01-31 15:18:33 +01:00 committed by Stéphane Nicolet
parent 3302349662
commit d1fd1a96bc
1 changed files with 1 additions and 3 deletions
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4
src/search.cpp
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@ -747,9 +747,7 @@ namespace {
{
if ((ss-1)->currentMove != MOVE_NULL)
{
int p = (ss-1)->statScore;
int bonus = p > 0 ? (-p - 2500) / 512 :
p < 0 ? (-p + 2500) / 512 : 0;
int bonus = -(ss-1)->statScore / 512;
pureStaticEval = evaluate(pos);
ss->staticEval = eval = pureStaticEval + bonus;