int MapA1D1D4[SQUARE_NB];
int MapKK[10][SQUARE_NB]; // [MapA1D1D4][SQUARE_NB]
-int Binomial[6][SQUARE_NB]; // [k][n] k elements from a set of n elements
+int Binomial[7][SQUARE_NB]; // [k][n] k elements from a set of n elements
int LeadPawnIdx[6][SQUARE_NB]; // [leadPawnsCnt][SQUARE_NB]
int LeadPawnsSize[6][4]; // [leadPawnsCnt][FILE_A..FILE_D]
std::swap(squares[0], *std::max_element(squares, squares + leadPawnsCnt, pawns_comp));
- tbFile = file_of(squares[0]);
- if (tbFile > FILE_D)
- tbFile = file_of(squares[0] ^ 7); // Horizontal flip: SQ_H1 -> SQ_A1
+ tbFile = map_to_queenside(file_of(squares[0]));
}
// DTZ tables are one-sided, i.e. they store positions only for white to
enum { Split = 1, HasPawns = 2 };
- assert(e.hasPawns == !!(*data & HasPawns));
- assert((e.key != e.key2) == !!(*data & Split));
+ assert(e.hasPawns == bool(*data & HasPawns));
+ assert((e.key != e.key2) == bool(*data & Split));
data++; // First byte stores flags
Binomial[0][0] = 1;
for (int n = 1; n < 64; n++) // Squares
- for (int k = 0; k < 6 && k <= n; ++k) // Pieces
+ for (int k = 0; k < 7 && k <= n; ++k) // Pieces
Binomial[k][n] = (k > 0 ? Binomial[k - 1][n - 1] : 0)
+ (k < n ? Binomial[k ][n - 1] : 0);