/usr/include/osl/move_classifier/pawnDropCheckmate.h is in libosl-dev 0.6.0-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*/
#ifndef OSL_MOVE_CLASSIFIER_PAWNDROPCHECKMATE_H
#define OSL_MOVE_CLASSIFIER_PAWNDROPCHECKMATE_H
#include "osl/state/numEffectState.h"
#include "osl/effect_util/effectUtil.h"
#include "osl/checkmate/king8Info.h"
namespace osl
{
namespace move_classifier
{
/**
* 打歩詰の判定.
* @param P 指手(攻撃)側
*/
template <Player P>
struct PawnDropCheckmate
{
/**
* kingSquare に居る alt(P)の玉が dir 方向に逃げられるか.
*/
static bool canEscape(const NumEffectState& state, Square kingSquare,
Direction dir, Square dropAt);
/** 王が前以外に移動可能か */
static bool escape7(const NumEffectState& state,
Square kingSquare, Square to);
static bool isMember(const NumEffectState& state,
Ptype ptype,Square from,Square to)
{
// 打歩
if (! from.isPieceStand())
return false;
if (ptype != PAWN)
return false;
const Player Opponent = PlayerTraits<P>::opponent;
const Piece king = state.template kingPiece<Opponent>();
const Square king_position = king.square();
// DirectionPlayerTraits?
// 玉頭
if (king_position != (to + DirectionPlayerTraits<U,P>::offset()))
return false;
// 玉で取れない
if (! state.hasEffectAt(P, to))
return false;
if (King8Info(state.Iking8Info(Opponent)).liberty() != 0)
return false;
// 玉以外の駒で取れない
if (EffectUtil::template safeCaptureNotByKing<Opponent>
(state, to, king)
!= Piece::EMPTY())
return false;
// どこにも逃げられない
return escape7(state, king_position, to);
}
};
} // namespace move_classifier
} // namespace osl
template <osl::Player P>
bool
#ifdef __GNUC__
__attribute__ ((pure))
#endif
osl::move_classifier::PawnDropCheckmate<P>::
canEscape(const NumEffectState& state, Square kingSquare,
Direction dir, Square dropAt)
{
const Player Opponent = PlayerTraits<P>::opponent;
const Square target
= kingSquare + Board_Table.getOffset(Opponent, dir);
const Piece p = state.pieceAt(target);
if (p.isOnBoardByOwner<Opponent>())
return false; // 自分の駒がいたら移動不能
if (target.isEdge())
return false;
Piece attacker;
if (! state.template hasEffectAt<P>(target, attacker))
return true; // 利きがない
if (attacker == Piece::EMPTY())
return false; // 攻撃側に複数の利き
assert(attacker.owner() == P);
// drop によりふさがれた利きなら逃げられる
// -OU
// XXX+FU+HI
// の場合のXXXなど．
const Offset shortOffset
= Board_Table.getShortOffsetNotKnight(Offset32(target,dropAt));
if (shortOffset.zero())
return false;
const Square attackFrom = attacker.square();
return shortOffset
== Board_Table.getShortOffsetNotKnight(Offset32(dropAt,attackFrom));
}
template <osl::Player P>
bool
#ifdef __GNUC__
__attribute__ ((pure))
#endif
osl::move_classifier::PawnDropCheckmate<P>::
escape7(const NumEffectState& state, Square king_position, Square to)
{
// U は歩
if (canEscape(state, king_position, UL, to))
return false;
if (canEscape(state, king_position, UR, to))
return false;
if (canEscape(state, king_position, L, to))
return false;
if (canEscape(state, king_position, R, to))
return false;
if (canEscape(state, king_position, DL, to))
return false;
if (canEscape(state, king_position, D, to))
return false;
if (canEscape(state, king_position, DR, to))
return false;
return true;
}
#endif /* OSL_MOVE_CLASSIFIER_PAWNDROPCHECKMATE_H */
// ;;; Local Variables:
// ;;; mode:c++
// ;;; c-basic-offset:2
// ;;; End:
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