h#4.5
8/8/8/6k1/8/8/1r2r3/K4Q2 w - - 0 1
- Qb1 Kf4 Qxb2 Ke3 Qa3+ Kd2 Kb1 Kd1 Qc1#
KQvkrr
5 pieces.
- h#6
- longest mate
- h#4.5
- deepest unique
- 460
- positions at that depth
- h#5
- deepest dual
- h#4.5
- deepest strict dual
- 65,360,823
- positions with a helpmate
- 2,746,279
- with a unique solution
- 121,110,528
- cells in the plane
- 47,480,371 bytes
- on disk
Deepest unique problems
h#4.5
8/5Q2/8/8/6k1/1r6/r7/K7 w - - 0 1
- Kxa2 Kg3 Qc4 Kf2 Kxb3 Ke1 Kc3 Kd1 Qf1#
pure model ideal mirror single-piece single-piece:black nocheck
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#4.5
8/8/8/8/r6k/3Q4/8/Kr6 w - - 0 1
- Kxb1 Kg4 Qg6+ Kf3 Kc2 Kf2 Kd3 Ke1 Qg1#
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.
Deepest dual problems
Deepest dual with different first and last moves: h#4.5. 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#4.5
4k3/8/8/8/8/5Q2/3r4/2rK4 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxc1 Kd7 Qf8 Kc6 Kxd2 Kb5 Kc3 Ka4 Qb4#
- Kxd2 Ke7 Qb7+ Kf6 Ke3 Kg6 Kf4 Kh5 Qh7#
pure model mirror single-piece single-piece:black
Note: the diagram has no legal last move, so it cannot arise in a game.
h#4.5
4k3/8/7Q/8/8/8/1r6/2rK4 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxc1 Kd7 Qf8 Kc6 Kxb2 Kb5 Kc3 Ka4 Qb4#
- 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.