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Tune scale and optimism.

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Tune scale and optimism in effort to make stockfish play more aggressively.

STC @ 10+0.1 th 1:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 27896 W: 7506 L: 7248 D: 13142
Ptnml(0-2): 103, 3047, 7388, 3309, 101
https://tests.stockfishchess.org/tests/live_elo/627fd0cfab44257388ab1f13

LTC @ 60+0.6 th 1:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 65576 W: 17512 L: 17178 D: 30886
Ptnml(0-2): 37, 6397, 19587, 6729, 38
https://tests.stockfishchess.org/tests/live_elo/627ff666ab44257388ab256d

closes https://github.com/official-stockfish/Stockfish/pull/4025

Bench 6407734
This commit is contained in:
xoto10 2022-05-15 13:14:28 +01:00 • committed by Joost VandeVondele
parent 5372f81cc8
commit 22b7909809
1 changed files with 4 additions and 3 deletions
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7
src/evaluate.cpp
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@ -192,6 +192,7 @@ using namespace Trace;
namespace {
// Threshold for lazy and space evaluation
constexpr Value LazyThreshold1 = Value(3631);
constexpr Value LazyThreshold2 = Value(2084);
@ -1099,14 +1100,14 @@ Value Eval::evaluate(const Position& pos) {
if (useNNUE && !useClassical)
{
Value nnue = NNUE::evaluate(pos, true); // NNUE
int scale = 1036 + 22 * pos.non_pawn_material() / 1024;
int scale = 1014 + 21 * pos.non_pawn_material() / 1024;
Color stm = pos.side_to_move();
Value optimism = pos.this_thread()->optimism[stm];
Value psq = (stm == WHITE ? 1 : -1) * eg_value(pos.psq_score());
int complexity = 35 * abs(nnue - psq) / 256;
optimism = optimism * (44 + complexity) / 31;
v = (nnue + optimism) * scale / 1024 - optimism;
optimism = optimism * (32 + complexity) / 32;
v = (nnue * scale + optimism * (scale - 846)) / 1024;
if (pos.is_chess960())
v += fix_FRC(pos);