h#7
k7/8/8/2q5/7N/3K4/7N/8 b - - 0 1
- Kb7 Ke4 Kc6 Kf4 Kd5 Kg5 Ke6+ Kh6 Kf7 Ng4 Kg8 Nf6+ Kh8 Ng6#
mirror single-piece single-piece:black nocapture
Published as Sheglow (1998)
- Sheglow, Wiktor S. — Suomen Tehtäväniekat, No. (269), 05-06/1998
KNNvkq
5 pieces.
- h#8.5
- longest mate
- h#7
- deepest unique
- 1
- positions at that depth
- h#7.5
- deepest dual
- h#5.5
- deepest strict dual
- 77,145,508
- positions with a helpmate
- 829,906
- with a unique solution
- 121,110,528
- cells in the plane
- 44,170,856 bytes
- on disk
Deepest unique problems
Only one position exists at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#7.5, where the two solutions share a first or a last move.
h#5.5
5N2/8/7k/8/3q4/N7/8/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Kg5 Nb5 Kf4 Ne6+ Ke3 Nexd4 Kd2 Nf3+ Kd1 Nc3#
- Ka2 Kg5 Nd7 Kf4 Nc5 Ke3 Nc2+ Kd2 Ne3 Kc1 Nb3#
pure model ideal mirror single-piece single-piece:black umnov
Note: the side to move is in check in the diagram.
h#5.5
8/5k2/8/1N6/8/3q4/N7/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ka1 Ke6 Nc1 Kd5 Nxd3 Kc4 Nc5 Kb4 Nd4 Ka3 Nc2#
- Kb2 Ke6 Nc1 Kd5 Nxd3 Kc4 Ne5+ Kb4 Nc6+ Ka4 Nc3#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#5.5
8/6k1/8/4N1q1/6N1/8/8/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nf6 Kh6 Kc2 Qg2+ Kd3 Kg5 Ke3 Kh4 Kf4 Qh3 Ng6#
- Nd3 Kg6 Kc2 Kh5 Kd1 Kh4 Ke2 Kh3 Kf3 Qh4 Nf4#