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Assorted trivial cleanups June 2019

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No functional change.
This commit is contained in:
Marco Costalba
2019-06-09 15:07:36 +02:00
committed by Stéphane Nicolet
parent c83cbe42f3
commit 4ae5a7b45a
5 changed files with 29 additions and 22 deletions
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18
src/pawns.cpp
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@@ -32,9 +32,9 @@ namespace {
#define S(mg, eg) make_score(mg, eg)
// Pawn penalties
constexpr Score Backward = S( 9, 24);
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
constexpr Score Backward = S( 9, 24);
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
constexpr Score WeakUnopposed = S( 13, 27);
constexpr Score Attacked2Unsupported = S( 0, 20);
@@ -108,17 +108,18 @@ namespace {
phalanx = neighbours & rank_bb(s);
support = neighbours & rank_bb(s - Up);
// A pawn is backward when it is behind all pawns of the same color
// on the adjacent files and cannot be safely advanced.
backward = !(ourPawns & pawn_attack_span(Them, s + Up))
// A pawn is backward when it is behind all pawns of the same color on
// the adjacent files and cannot safely advance. Phalanx and isolated
// pawns will be excluded when the pawn is scored.
backward = !(neighbours & forward_ranks_bb(Them, s))
&& (stoppers & (leverPush | (s + Up)));
// Passed pawns will be properly scored in evaluation because we need
// full attack info to evaluate them. Include also not passed pawns
// which could become passed after one or two pawn pushes when are
// not attacked more times than defended.
if ( !(stoppers ^ lever) ||
(!(stoppers ^ leverPush) && popcount(phalanx) >= popcount(leverPush)))
if ( !(stoppers ^ lever) ||
(!(stoppers ^ leverPush) && popcount(phalanx) >= popcount(leverPush)))
e->passedPawns[Us] |= s;
else if (stoppers == square_bb(s + Up) && r >= RANK_5)
@@ -137,6 +138,7 @@ namespace {
score += make_score(v, v * (r - 2) / 4);
}
else if (!neighbours)
score -= Isolated + WeakUnopposed * int(!opposed);