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Increase weight for supported pawns

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This patch changes the weight for counting supports of pawns
from 17 to 21. Hopefully Stockfish will accept to play a bit
more of closed or semi-closed positions.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 13822 W: 3158 L: 2939 D: 7725
http://tests.stockfishchess.org/tests/view/5d89c3a10ebc595091802379

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 63066 W: 10590 L: 10236 D: 42240
http://tests.stockfishchess.org/tests/view/5d89ca7f0ebc595091802680

Future work: try to tweak the evaluation to better understand
the French structures.

Closes https://github.com/official-stockfish/Stockfish/pull/2326

Bench: 3618154
This commit is contained in:
Stéphane Nicolet 2019-09-24 12:41:45 +02:00
parent d232a4ae68
commit 667d24f227
1 changed files with 1 additions and 1 deletions
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2
src/pawns.cpp
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@ -131,7 +131,7 @@ namespace {
if (support | phalanx)
{
int v = Connected[r] * (2 + bool(phalanx) - opposed)
+ 17 * popcount(support);
+ 21 * popcount(support);
score += make_score(v, v * (r - 2) / 4);
}