template<Color Us>
Value Entry::shelter_storm(const Position& pos, Square ksq) {
- constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
+ constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
+ constexpr Direction Down = (Us == WHITE ? SOUTH : NORTH);
enum { BlockedByKing, Unopposed, BlockedByPawn, Unblocked };
int d = std::min(f, ~f);
safety -= ShelterWeakness[f == file_of(ksq)][d][rkUs]
+ StormDanger
- [f == file_of(ksq) && rkThem == relative_rank(Us, ksq) + 1 ? BlockedByKing :
- rkUs == RANK_1 ? Unopposed :
- rkThem == rkUs + 1 ? BlockedByPawn : Unblocked]
+ [(shift<Down>(b) & ksq) ? BlockedByKing :
+ rkUs == RANK_1 ? Unopposed :
+ rkThem == (rkUs + 1) ? BlockedByPawn : Unblocked]
[d][rkThem];
}