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Small cleanups

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closes https://github.com/official-stockfish/Stockfish/pull/2756

No functional change
This commit is contained in:
Joost VandeVondele
2020-06-24 22:19:58 +02:00
parent 11483fe6d9
commit ab5cd8340f
18 changed files with 124 additions and 86 deletions
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14
src/endgame.cpp
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@@ -268,7 +268,7 @@ Value Endgame<KQKP>::operator()(const Position& pos) const {
}
/// KQ vs KR. This is almost identical to KX vs K: We give the attacking
/// KQ vs KR. This is almost identical to KX vs K: we give the attacking
/// king a bonus for having the kings close together, and for forcing the
/// defending king towards the edge. If we also take care to avoid null move for
/// the defending side in the search, this is usually sufficient to win KQ vs KR.
@@ -291,7 +291,7 @@ Value Endgame<KQKR>::operator()(const Position& pos) const {
/// KNN vs KP. Very drawish, but there are some mate opportunities if we can
// press the weakSide King to a corner before the pawn advances too much.
/// press the weakSide King to a corner before the pawn advances too much.
template<>
Value Endgame<KNNKP>::operator()(const Position& pos) const {
@@ -352,7 +352,7 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
Square weakPawn = frontmost_sq(strongSide, pos.pieces(weakSide, PAWN));
// There's potential for a draw if our pawn is blocked on the 7th rank,
// the bishop cannot attack it or they only have one pawn left
// the bishop cannot attack it or they only have one pawn left.
if ( relative_rank(strongSide, weakPawn) == RANK_7
&& (strongPawns & (weakPawn + pawn_push(weakSide)))
&& (opposite_colors(strongBishop, weakPawn) || !more_than_one(strongPawns)))
@@ -365,7 +365,7 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
// closer. (I think this rule only fails in practically
// unreachable positions such as 5k1K/6p1/6P1/8/8/3B4/8/8 w
// and positions where qsearch will immediately correct the
// problem such as 8/4k1p1/6P1/1K6/3B4/8/8/8 w)
// problem such as 8/4k1p1/6P1/1K6/3B4/8/8/8 w).
if ( relative_rank(strongSide, weakKing) >= RANK_7
&& weakKingDist <= 2
&& weakKingDist <= strongKingDist)
@@ -576,7 +576,7 @@ ScaleFactor Endgame<KRPPKRP>::operator()(const Position& pos) const {
}
/// K and two or more pawns vs K. There is just a single rule here: If all pawns
/// K and two or more pawns vs K. There is just a single rule here: if all pawns
/// are on the same rook file and are blocked by the defending king, it's a draw.
template<>
ScaleFactor Endgame<KPsK>::operator()(const Position& pos) const {
@@ -693,7 +693,7 @@ ScaleFactor Endgame<KBPPKB>::operator()(const Position& pos) const {
}
/// KBP vs KN. There is a single rule: If the defending king is somewhere along
/// KBP vs KN. There is a single rule: if the defending king is somewhere along
/// the path of the pawn, and the square of the king is not of the same color as
/// the stronger side's bishop, it's a draw.
template<>
@@ -717,7 +717,7 @@ ScaleFactor Endgame<KBPKN>::operator()(const Position& pos) const {
/// KP vs KP. This is done by removing the weakest side's pawn and probing the
/// KP vs K bitbase: If the weakest side has a draw without the pawn, it probably
/// KP vs K bitbase: if the weakest side has a draw without the pawn, it probably
/// has at least a draw with the pawn as well. The exception is when the stronger
/// side's pawn is far advanced and not on a rook file; in this case it is often
/// possible to win (e.g. 8/4k3/3p4/3P4/6K1/8/8/8 w - - 0 1).