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Simplify condition for backward pawn

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No functional changes.
This commit is contained in:
homoSapiensSapiens 2013-08-22 15:34:13 +03:00 • committed by Marco Costalba
parent c4533e0d94
commit b9f5d1c6ff
1 changed files with 6 additions and 6 deletions
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12
src/pawns.cpp
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@ -129,15 +129,15 @@ namespace {
opposed = theirPawns & forward_bb(Us, s);
passed = !(theirPawns & passed_pawn_mask(Us, s));
// Test for backward pawn
backward = false;
// Test for backward pawn.
// If the pawn is passed, isolated, or member of a pawn chain it cannot
// be backward. If there are friendly pawns behind on adjacent files
// or if can capture an enemy pawn it cannot be backward either.
if ( !(passed | isolated | chain)
&& !(ourPawns & pawn_attack_span(Them, s))
&& !(pos.attacks_from<PAWN>(s, Us) & theirPawns))
if ( (passed | isolated | chain)
|| (ourPawns & pawn_attack_span(Them, s))
|| (pos.attacks_from<PAWN>(s, Us) & theirPawns))
backward = false;
else
{
// We now know that there are no friendly pawns beside or behind this
// pawn on adjacent files. We now check whether the pawn is