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Scale up space weight with number of blocked pawns

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This idea is loosely based on stockfish losses in closed positions in different tournaments. Space weight symmetrically increases for both sides the more blocked position is.

passed STC
https://tests.stockfishchess.org/tests/view/5e919eefaf0a0143109dc8ce
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 16994 W: 3389 L: 3172 D: 10433
Ptnml(0-2): 277, 1931, 3918, 2040, 331

passed LTC
https://tests.stockfishchess.org/tests/view/5e91d04faf0a0143109dc8ea
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 133386 W: 17316 L: 16763 D: 99307
Ptnml(0-2): 945, 12407, 39524, 12784, 1033

closes https://github.com/official-stockfish/Stockfish/pull/2626

Bench: 4966867
This commit is contained in:
Vizvezdenec
2020-04-13 03:48:52 +03:00
committed by Joost VandeVondele
parent d7a2d5a445
commit db59696aaf
3 changed files with 6 additions and 1 deletions
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2
src/evaluate.cpp
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@@ -695,7 +695,7 @@ namespace {
behind |= shift<Down+Down>(behind);
int bonus = popcount(safe) + popcount(behind & safe & ~attackedBy[Them][ALL_PIECES]);
int weight = pos.count<ALL_PIECES>(Us) - 1;
int weight = pos.count<ALL_PIECES>(Us) - 2 + pe->blocked_count() / 2;
Score score = make_score(bonus * weight * weight / 16, 0);
if (T)