KQvk

h#6

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

1. Kh7 Kb2 Kh8 Kc3 Kh7 Kd4 Kh8 Ke5 Kh7 Kf6 Kh8 Qg7#

pure model ideal switchback single-piece single-piece:black nocapture nocheck

Note: the side to move is in check in the diagram.

h#3.5

8/5Q2/8/8/8/6k1/8/K7 w - - 0 1

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

1. Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
2. Qc4 Kf2 Kb2 Ke1 Kc3 Kd1 Qf1#

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

h#3.5

8/8/8/8/6k1/8/2Q5/K7 w - - 0 1

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

1. Kb2 Kf3 Qf5+ Ke2 Kc3 Kd1 Qf1#
2. Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#

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

h#3.5

8/6k1/1Q6/8/8/8/8/3K4 w - - 0 1

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

1. Qg1+ Kh6 Ke2 Kh5 Kf3 Kh4 Qg4#
2. Qe3 Kg6 Ke2 Kh5 Kf3 Kh4 Qh6#

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