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Space Invaders 

Try a more ambitius simplification of the space bonus

STC http://tests.stockfishchess.org/tests/view/5d2b62c90ebc5925cf0da2a4
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 51299 W: 11320 L: 11257 D: 28722

LTC http://tests.stockfishchess.org/tests/view/5d2bac270ebc5925cf0db215
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 49761 W: 8409 L: 8335 D: 33017

Closes https://github.com/official-stockfish/Stockfish/pull/2243

bench: 3395999
pull/2257/head
Alain SAVARD 2019-07-14 13:13:06 -04:00 committed by Stéphane Nicolet
parent 7090d2561a
commit 3ec362e4b2
1 changed files with 1 additions and 4 deletions
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5
src/evaluate.cpp
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@ -133,7 +133,6 @@ namespace {
};
// Assorted bonuses and penalties
constexpr Score AttacksOnSpaceArea = S( 4, 0);
constexpr Score BishopPawns = S( 3, 7);
constexpr Score CorneredBishop = S( 50, 50);
constexpr Score FlankAttacks = S( 8, 0);
@ -705,12 +704,10 @@ namespace {
behind |= shift<Down>(behind);
behind |= shift<Down+Down>(behind);
int bonus = popcount(safe) + popcount(behind & safe);
int bonus = popcount(safe) + popcount(behind & safe & ~attackedBy[Them][ALL_PIECES]);
int weight = pos.count<ALL_PIECES>(Us) - 1;
Score score = make_score(bonus * weight * weight / 16, 0);
score -= AttacksOnSpaceArea * popcount(attackedBy[Them][ALL_PIECES] & behind & safe);
if (T)
Trace::add(SPACE, Us, score);