KQQvkr

h#5

8/8/2rQ4/7Q/6k1/8/8/K7 b - - 0 1

1. Kxh5 Qxc6 Kg4 Qh6 Kf3 Kb2 Ke2 Kc3 Kd1 Qd2#

switchback single-piece single-piece:black nocheck

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

h#5

8/7Q/8/6Q1/1r5k/8/8/K7 b - - 0 1

1. Kxg5 Ka2 Kf4 Ka3 Ke3 Kxb4 Kd2 Kb3 Kc1 Qc2#

single-piece single-piece:black nocheck

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

h#5

8/8/8/6Qk/8/5r1Q/8/1K6 b - - 0 1

1. Kxg5 Qxf3 Kh4 Qh5+ Kg3 Kc2 Kf2 Kd3 Ke1 Qe2#

single-piece single-piece:black

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

h#4

8/8/6Q1/5k2/5Q2/8/r7/2K5 b - - 0 1

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

1. Kxf4 Kb1 Ke3 Kxa2 Kd2 Kb3 Kc1 Qc2#
2. Kxg6 Kd1 Ra6 Ke2 Kh5 Kf3 Rh6 Qg4#

pure model ideal self-block single-piece single-piece:black nocheck zilahi

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

h#4

3k4/3Q4/8/8/8/8/1Q1r4/2K5 b - - 0 1

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

1. Kxd7 Kxd2 Kc6 Qf6+ Kb5 Kc3 Ka4 Qa6#
2. Rxd7 Kc2 Kc7 Kb3 Kb6 Kc4+ Ka5 Qb5#

pure model ideal mirror single-piece single-piece:black

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

h#4

8/5Q2/3Qk3/8/8/8/1r6/3K4 b - - 0 1

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

1. Kxd6 Kc1 Kc5 Kxb2 Kb4 Kc2 Ka3 Qb3#
2. Kxf7 Qd2 Kg6 Ke2 Kh5 Kf3 Kh4 Qh6#

pure model mirror single-piece single-piece:black nocheck zilahi

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