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Simplify pawn asymmetry (remove use of semiopen files). (#2054)

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This is a functional simplification.

To me, the exclusive OR of semiopenFiles here is quite convoluted. Looks like it can be removed.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43885 W: 9731 L: 9653 D: 24501
http://tests.stockfishchess.org/tests/view/5c9041680ebc5925cfff10ea

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 68437 W: 11577 L: 11533 D: 45327
http://tests.stockfishchess.org/tests/view/5c9101740ebc5925cfff1cbf

bench 3575627
This commit is contained in:
protonspring
2019-03-24 10:41:25 -06:00
committed by Marco Costalba
parent 2f11c03bbf
commit 7133598a98
3 changed files with 6 additions and 7 deletions
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3
src/pawns.cpp
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@@ -185,8 +185,7 @@ Entry* probe(const Position& pos) {
e->key = key;
e->scores[WHITE] = evaluate<WHITE>(pos, e);
e->scores[BLACK] = evaluate<BLACK>(pos, e);
e->asymmetry = popcount( (e->passedPawns[WHITE] | e->passedPawns[BLACK])
| (e->semiopenFiles[WHITE] ^ e->semiopenFiles[BLACK]));
e->passedCount= popcount(e->passedPawns[WHITE] | e->passedPawns[BLACK]);
return e;
}