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Code Issues Releases Wiki Activity

Simplify backward pawn definition

Browse source 
Make use of 'lever' attribute

No functional change

Resolves #234
This commit is contained in:
Alain SAVARD 2015-01-26 11:05:53 -05:00 • committed by Joona Kiiski
parent 7837fb2aca
commit 8aa8608c2a
1 changed files with 4 additions and 5 deletions
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9
src/pawns.cpp
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@ -144,12 +144,11 @@ namespace {
lever = theirPawns & pawnAttacksBB[s];
// Test for backward pawn.
// If the pawn is passed, isolated, or connected it cannot be
// If the pawn is passed, isolated, connected or a lever it cannot be
// backward. If there are friendly pawns behind on adjacent files
// or if it can capture an enemy pawn it cannot be backward either.
if ( (passed | isolated | connected)
|| (ourPawns & pawn_attack_span(Them, s))
|| (pos.attacks_from<PAWN>(s, Us) & theirPawns))
// it cannot be backward either.
if ( (passed | isolated | connected | lever)
|| (ourPawns & pawn_attack_span(Them, s)))
backward = false;
else
{