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Simplify chain detection

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No functional change.
This commit is contained in:
homoSapiensSapiens
2013-08-25 17:59:47 +03:00
committed by Marco Costalba
parent 04fd7efdfa
commit 6e6c5b6103
1 changed files with 1 additions and 3 deletions
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4
src/pawns.cpp
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@@ -92,7 +92,6 @@ namespace {
Bitboard b;
Square s;
File f;
Rank r;
bool passed, isolated, doubled, opposed, chain, backward, candidate;
Score value = SCORE_ZERO;
const Square* pl = pos.list<PAWN>(Us);
@@ -113,13 +112,12 @@ namespace {
assert(pos.piece_on(s) == make_piece(Us, PAWN));
f = file_of(s);
r = rank_of(s);
// This file cannot be semi-open
e->semiopenFiles[Us] &= ~(1 << f);
// Our rank plus previous one. Used for chain detection
b = rank_bb(r) | rank_bb(Us == WHITE ? r - Rank(1) : r + Rank(1));
b = rank_bb(s) | rank_bb(s - pawn_push(Us));
// Flag the pawn as passed, isolated, doubled or member of a pawn
// chain (but not the backward one).