KQvkqr

h#5.5

8/8/5k2/8/6Q1/q7/8/Kr6 w - - 0 1

1. Kxb1 Qd3+ Kc1 Qg6 Kd2 Kg7 Ke3 Kh6 Kf4 Qh7 Qg5#

pure model ideal self-block

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

h#5.5

8/4Q3/6k1/8/8/3q4/r7/K7 w - - 0 1

1. Kxa2 Qd4 Kb3 Qg7 Kc4 Kh7 Kd5 Kg8 Ke6 Qh8 Qf7#

pure model ideal self-block nocheck

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

h#5.5

8/8/6k1/8/5Q2/8/6q1/rK6 w - - 0 1

1. Kxa1 Kh5 Qe5+ Kg4 Kb1 Kf3 Kc1 Kf2 Kd1 Kf1 Qe1#

switchback single-piece single-piece:black

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

h#4.5

8/8/8/4k3/8/3Q4/6q1/Kr6 w - - 0 1

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

1. Kxb1 Kf4 Qe4+ Kg3 Kc1 Kf2 Kd1 Kf1 Qe1#
2. Qxb1 Kd4 Qe4+ Kc3 Kb1 Kb3 Kc1 Ka2 Qa4#

pure model mirror single-piece single-piece:black

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

h#4.5

4k3/8/8/5r2/8/8/2qQ4/2K5 w - - 0 1

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

1. Kxc2 Kf7 Kd3 Kg6 Ke4 Kh5 Kxf5 Kh4 Qh2#
2. Qxc2 Kd7 Qb1 Kc6 Kb2 Kb5 Kc3+ Ka4 Qb4#

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#4.5

4k3/8/7Q/8/8/8/1r6/2qK4 w - - 0 1

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

1. Kxc1 Kd7 Qf8 Kc6 Kxb2 Kb5 Kc3 Ka4 Qb4#
2. Qxc1 Kf7 Qd2 Kg6 Ke2 Kh5 Kf3 Kh4 Qh6#

pure model mirror closed-walk single-piece single-piece:black nocheck

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