Diagonal Mirroring

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[.jpg) Hilma af Klint - Group IX SUW, The Swan No. 7 [1] Diagonal mirroring mirrors all pieces along the main diagonal or main anti-diagonal. It is applicable in pawn-less endgames with castling no longer possible. Along with horizontal and/or vertical flipping, diagonal mirroring is used in pawn-less endgame tablebases to restrict a white king to the 10 squares of the a1-d4-d1 triangle of the board.

Mirroring an 8x8 Board

An 8x8 Board with a rank-file mapping needs to swap rank and file. A pure 8x8 Board may be mirrored along the main diagonal that way in C:


int board[64], f, r, sm, sq, s;

for (f = 1; f < 8; ++f)
for (r = 0; r < f; ++r)
{
  sq = 8*r + f;
  sm = 8*f + r;
  s = board[sq];
  board[sq] = board[sm];
  board[sm] = s;
}