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Remove pawn count in space() calculation #2139

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Simplification. Various attempts to optimise the pawn
count bonus showed little effect, so remove pawn count
altogether and compensate by subtracting 1 instead of 4.

STC 10+0.1 th 1:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 152244 W: 33709 L: 33847 D: 84688
http://tests.stockfishchess.org/tests/view/5cceed330ebc5925cf04170e

LTC 60+0.6 th 1:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 24100 W: 4079 L: 3964 D: 16057
http://tests.stockfishchess.org/tests/view/5cd5b6b80ebc5925cf04e889

Bench: 3648841
This commit is contained in:
xoto10 2019-05-05 14:22:40 +01:00 • committed by Marco Costalba
parent 5f4d44fda0
commit a8abba0b4d
1 changed files with 1 additions and 3 deletions
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4
src/evaluate.cpp
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@ -719,9 +719,7 @@ namespace {
behind |= shift<Down+Down>(behind);
int bonus = popcount(safe) + popcount(behind & safe);
int weight = pos.count<ALL_PIECES>(Us)
- (16 - pos.count<PAWN>()) / 4;
int weight = pos.count<ALL_PIECES>(Us) - 1;
Score score = make_score(bonus * weight * weight / 16, 0);
if (T)