h#5
8/8/8/8/8/8/5R2/K4Rqk b - - 0 1
- Qxf1+ Kb2 Kg1 Rc2 Qf2 Kc3 Kf1 Kd3 Ke1 Rc1#
pure model ideal self-block umnov
Note: the solution begins with a capture.
KRRvkq
5 pieces.
- h#7
- longest mate
- h#5
- deepest unique
- 219
- positions at that depth
- h#5
- deepest dual
- h#4
- deepest strict dual
- 65,857,545
- positions with a helpmate
- 6,063,307
- with a unique solution
- 121,110,528
- cells in the plane
- 47,240,016 bytes
- on disk
Deepest unique problems
h#5
8/8/8/4R3/4kR2/3q4/8/K7 b - - 0 1
- Kxf4 Rd5 Ke3 Ka2 Kd2 Rxd3+ Kc1 Kb3 Kb1 Rd1#
pure model ideal mirror single-piece single-piece:black
Note: the diagram has no legal last move, so it cannot arise in a game.
h#5
8/8/8/1q6/6Rk/7R/8/K7 b - - 0 1
- Kxg4 Rh4+ Kf3 Rb4 Ke2 Kb2 Kd1 Kc3 Qe2 Rb1#
pure model ideal self-block umnov
Note: the diagram has no legal last move, so it cannot arise in a game.
Deepest dual problems
Deepest dual with different first and last moves: h#4. The deepest dual overall is h#5, where the two solutions share a first or a last move.
Only 2 distinct ideas exist at this depth.
h#4
8/8/8/8/R7/2kR4/3q4/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxd3 Ka1 Kc2 Ka2 Kd1+ Kb3 Kc1 Ra1#
- Qxd3+ Kc1 Kb3 Rd4 Ka2 Rxd3 Ka1 Ra3#
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
8/8/8/q7/8/8/1K3R2/4R1k1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxf2 Ra1 Ke2 Rxa5 Kd1 Kc3 Kc1 Ra1#
- Qxe1 Rc2 Qf2 Kc3 Kf1 Kd3 Ke1 Rc1#
pure model ideal mirror switchback self-block single-piece single-piece:black kniest nocheck umnov zilahi
Note: the side to move is in check in the diagram; the solution begins with a capture.