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Remove previousScore adjustment of delta.

Browse Source 
STC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 14580 W: 2904 L: 2731 D: 8945
Ptnml(0-2): 243, 1665, 3339, 1762, 281
https://tests.stockfishchess.org/tests/view/5e7d080ae42a5c3b3ca2ebc6

LTC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 60338 W: 7870 L: 7831 D: 44637
Ptnml(0-2): 451, 5596, 18018, 5671, 433
https://tests.stockfishchess.org/tests/view/5e7d11b3e42a5c3b3ca2ebd3

closes https://github.com/official-stockfish/Stockfish/pull/2598

Bench 5247262
This commit is contained in:
xoto10
2020-03-26 19:47:48 +00:00
committed by Joost VandeVondele
parent 58746d9fb8
commit 8c73339a36
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -433,7 +433,7 @@ void Thread::search() {
if (rootDepth >= 4)
{
Value previousScore = rootMoves[pvIdx].previousScore;
delta = Value(21 + abs(previousScore) / 256);
delta = Value(21);
alpha = std::max(previousScore - delta,-VALUE_INFINITE);
beta = std::min(previousScore + delta, VALUE_INFINITE);