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KRvkbn
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 12
- positions at that depth
- h#6
- deepest dual
- h#5.5
- deepest strict dual
- 163,332,648
- positions with a helpmate
- 6,735,121
- with a unique solution
- 121,110,528
- cells in the plane
- 74,243,651 bytes
- on disk
Deepest unique problems
h#6
8/8/7k/8/2b5/8/7R/K2n4 b - - 0 1
- Kg5 Rc2 Kf4 Rxc4+ Ke3 Ka2 Kd2 Rd4+ Kc1 Kb3 Kb1 Rxd1#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
Published as Sheglow (1998)
- Sheglow, Wiktor S. — Suomen Tehtäväniekat, No. (306), 05-06/1998
h#6
7R/8/7k/8/8/8/3n4/K1b5 b - - 0 1
- Kg7 Ka2 Ne4 Kb3 Nf6 Kc4 Ng8 Kd5 Kf8 Ke6 Ke8 Rxg8#
pure model mirror nocheck
Note: the side to move is in check in the diagram.
h#6
7k/8/8/8/8/b7/7R/K1n5 b - - 0 1
- Kg7 Kb1 Ne2 Kc2 Ng1 Kd3 Nh3 Ke4 Kh6 Kf5 Kh5 Rxh3#
pure model mirror nocheck
Note: the side to move is in check in the diagram.
Deepest dual problems
Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#5.5
8/7R/5k2/2n5/8/b7/8/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Bc1 Kc2 Bh6 Kd1 Kg5 Ke2 Kh4 Kf3 Kh3 Rxh6#
- Ka2 Ne6 Kxa3 Ng7 Kb4 Ke7 Kc5 Kd8 Kd6 Nh5 Rh8#
pure model mirror nocheck
h#5.5
4k3/8/5R2/8/1n6/2b5/8/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rf1 Bf6 Kc1 Kf7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh1#
- Rf2 Bf6 Kc1 Kf7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh2#
pure model mirror nocapture nocheck umnov
h#5.5
4k3/6R1/5b2/8/1n6/8/8/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rg1 Kf7 Kc1 Bg5+ Kd1 Kg6 Ke2 Kh5 Kf3 Kh4 Rh1#
- Rg2 Kf7 Kc1 Bg5+ Kd1 Kg6 Ke2 Kh5 Kf3 Kh4 Rh2#
pure model self-block nocapture