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a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 8
7 a7 b7 c7 d7 e7 f7 g7 h7 7
6 a6 b6 c6 xd d6 pl e6 xd f6 g6 h6 6
5 a5 b5 c5 xd d5 kl e5 xd f5 g5 h5 5
4 a4 b4 c4 qd d4 xd e4 rd f4 g4 h4 4
3 a3 b3 c3 d3 e3 f3 g3 h3 3
2 a2 b2 c2 d2 e2 f2 g2 h2 2
1 a1 b1 c1 d1 e1 f1 g1 h1 1
a b c d e f g h

In a Triangulation Checkmate, one square orthogonally adjacent to the king is blocked by a friendly piece. The two diagonally adjacent squares opposite of the friendly piece have an opposing Queen and Rook.

a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 r 8
7 a7 P b7 c7 Q d7 e7 f7 g7 K h7 7
6 a6 b6 c6 d6 e6 f6 g6 N h6 6
5 a5 p b5 c5 d5 e5 f5 P g5 h5 P 5
4 a4 b4 c4 d4 e4 f4 p g4 h4 4
3 a3 q b3 p c3 P d3 e3 f3 g3 h3 3
2 a2 b2 c2 k d2 e2 P f2 g2 h2 p 2
1 a1 b1 c1 d1 R e1 f1 g1 r h1 1
a b c d e f g h
1.Qc1#


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