KQQPvk

h#6

K7/8/8/8/8/8/P3Q3/6kQ b - - 0 1

1. Kxh1 Kb7 Kg1 Kc6 Kh1 Kd5 Kg1 Ke4 Kh1 Kf3 Kg1 Qg2#

switchback single-piece single-piece:black pendulum nocheck

Note: the side to move is in check in the diagram; the solution begins with a capture.

h#6

K7/8/8/8/6Q1/P7/7Q/7k b - - 0 1

1. Kxh2 Kb7 Kh1 Kc6 Kh2 Kd5 Kh1 Ke4 Kh2 Kf3 Kh1 Qg2#

pure model switchback single-piece single-piece:black pendulum nocheck

Note: the side to move is in check in the diagram; the solution begins with a capture.

h#6

K7/8/8/8/6Q1/8/P6k/7Q b - - 0 1

1. Kxh1 Kb7 Kh2 Kc6 Kh1 Kd5 Kh2 Ke4 Kh1 Kf3 Kh2 Qg2#

switchback single-piece single-piece:black pendulum nocheck

Note: the side to move is in check in the diagram; the solution begins with a capture.

h#3

8/8/8/8/8/4Q3/4Pk2/K4Q2 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

1. Kxf1 Kb2 Ke1 Kc3 Kd1 Qd2#
2. Kxe3 Kb2 Ke4 Kc3 Ke3 Qf3#

switchback single-piece single-piece:black kniest nocheck zilahi

Note: the diagram has no legal last move, so it cannot arise in a game.

h#3

8/8/5P2/8/3Q4/4kQ2/8/K7 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

1. Kxf3 f7 Ke2 f8=Q Ke1 Qff2#
2. Kxd4 f7 Ke5 f8=Q Ke6 Q3f5#

promotion single-piece single-piece:white single-piece:black phoenix nocheck

Note: the diagram has no legal last move, so it cannot arise in a game.

h#3

4Q3/2Qk4/8/8/3P4/8/8/1K6 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

1. Kxc7 Kc2 Kd6 Kd3 Kd5 Qd7#
2. Kxe8 d5 Kf8 d6 Ke8 Qe7#

pure model ideal switchback single-piece single-piece:black kniest nocheck zilahi

Note: the diagram has no legal last move, so it cannot arise in a game.