KBvkqrn

h#9.5

n7/8/4r3/8/8/5k2/2qB4/K7 w - - 0 1

1. Be3 Qd1+ Kb2 Nc7 Kc3 Nb5+ Kc4 Nd4 Kd5 Rd6+ Ke5 Ke2 Kf4 Ke1 Kg3 Ne2+ Kg2 Rd2 Bf2#

set-play pure model ideal self-block nocapture

h#9.5

8/1q6/1n6/8/8/8/r7/KBk5 w - - 0 1

1. Kxa2 Kd2 Be4 Kc3 Bxb7 Kb4 Ba6 Ka5 Kb3 Nc8 Kc4 Kb6 Kd5 Ka7 Kc6 Ka8 Kc7 Na7 Bb7#

pure model ideal switchback self-block nocheck

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

h#9.5

8/8/8/8/6n1/5r2/1q6/1K2B1k1 w - - 0 1

1. Kxb2 Nf6 Bb4 Kf2 Bf8 Ke3 Kc3 Kf4+ Kd4 Kg5 Ke5 Kg6 Ke6 Kh7 Kf7 Kh8 Kg6 Ng8 Bg7#

pure model self-block

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

h#8.5

7q/6n1/8/8/2r5/8/B1k5/K7 w - - 0 1

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

1. Bb1+ Kc3 Ka2 Rh4 Ka3 Kd4 Kb4 Ke5+ Kc5 Kf6 Kd6 Kf7 Bg6+ Kg8 Ke7 Rh7 Bf7#
2. Bb3+ Kc3 Kb1 Rc8 Kc1 Kd4+ Kd2 Ke5 Ke3 Kf6 Kf4 Kg6 Bf7+ Kh7 Kg5 Rg8 Bg6#

set-play pure model ideal self-block nocapture

h#8.5

7n/8/8/4k3/3r4/8/2q5/K6B w - - 0 1

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

1. Be4 Qg2 Bc2 Rh4 Kb2 Kf4 Kc3 Kg4 Kd4 Kh5+ Ke5 Nf7+ Kf6 Ng5 Kg7 Qg4 Bg6#
2. Bd5 Qc8 Bc4 Rd8 Kb2 Kd6 Kc3 Kd7 Kd4 Ke8+ Ke5 Ng6+ Kf6 Ne7 Kg7 Qd7 Bf7#

pure model ideal self-block nocapture umnov

h#8.5

n7/8/2r5/B5k1/8/2q5/8/K7 w - - 0 1

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

1. Kb1 Qh3 Bc3 Nb6 Kc2 Nc4 Bd2+ Ne3+ Kd3 Kh4 Ke4 Ng4 Kf5 Rc3 Kg6 Rg3 Bg5#
2. Ka2 Kf6 Bb6 Qa5+ Kb3 Ke7 Bc5+ Kd8 Kc4 Rc8 Kd5 Nb6+ Ke6 Nd7 Kf7 Qc7 Be7#

pure model ideal self-block nocapture umnov

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