- // Danger of enemy pawns moving toward our king by [type][distance from edge][rank].
- // For the unblocked case, RANK_1 = 0 is used when opponent has no pawn on the
- // given file, or their pawn is behind our king.
- constexpr Value StormDanger[][4][RANK_NB] = {
- { { V(25), V( 79), V(107), V( 51), V( 27) }, // UnBlocked
- { V(15), V( 45), V(131), V( 8), V( 25) },
- { V( 0), V( 42), V(118), V( 56), V( 27) },
- { V( 3), V( 54), V(110), V( 55), V( 26) } },
- { { V( 0), V( 0), V( 37), V( 5), V(-48) }, // BlockedByPawn
- { V( 0), V( 0), V( 68), V(-12), V( 13) },
- { V( 0), V( 0), V(111), V(-25), V( -3) },
- { V( 0), V( 0), V(108), V( 14), V( 21) } }
+ // Danger of enemy pawns moving toward our king by [distance from edge][rank].
+ // RANK_1 = 0 is used for files where the enemy has no pawn, or their pawn
+ // is behind our king. Note that UnblockedStorm[0][1-2] accommodate opponent pawn
+ // on edge, likely blocked by our king.
+ constexpr Value UnblockedStorm[int(FILE_NB) / 2][RANK_NB] = {
+ { V( 87), V(-288), V(-168), V( 96), V( 47), V( 44), V( 46) },
+ { V( 42), V( -25), V( 120), V( 45), V( 34), V( -9), V( 24) },
+ { V( -8), V( 51), V( 167), V( 35), V( -4), V(-16), V(-12) },
+ { V(-17), V( -13), V( 100), V( 4), V( 9), V(-16), V(-31) }