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Simplify passed pawns. (#2159)

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This is a functional simplification.

If all of the stoppers are levers, a simple pawn push passes.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 41768 W: 9360 L: 9278 D: 23130
http://tests.stockfishchess.org/tests/view/5ce82ed60ebc5925cf073a79

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 40463 W: 6964 L: 6875 D: 26624
http://tests.stockfishchess.org/tests/view/5ce87d0b0ebc5925cf07472b
This commit is contained in:
protonspring 2019-06-09 06:33:34 -06:00 • committed by Marco Costalba
parent 14e23d520f
commit 53d197b841
1 changed files with 2 additions and 3 deletions
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5
src/pawns.cpp
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@ -110,9 +110,8 @@ namespace {
// full attack info to evaluate them. Include also not passed pawns // full attack info to evaluate them. Include also not passed pawns
// which could become passed after one or two pawn pushes when are // which could become passed after one or two pawn pushes when are
// not attacked more times than defended. // not attacked more times than defended.
if ( !(stoppers ^ lever ^ leverPush) if ( !(stoppers ^ lever) ||
&& (support || !more_than_one(lever)) (!(stoppers ^ leverPush) && popcount(phalanx) >= popcount(leverPush)))
&& popcount(phalanx) >= popcount(leverPush))
e->passedPawns[Us] |= s; e->passedPawns[Us] |= s;
else if (stoppers == square_bb(s + Up) && r >= RANK_5) else if (stoppers == square_bb(s + Up) && r >= RANK_5)