h#7
8/4N2k/7p/7N/8/8/8/K7 b - - 0 1
- Kh8 Nf4 h5 Kb2 h4 Kc3 h3 Kd4 h2 Ke5 h1=R Kf6 Rh7 Nfg6#
set-play pure model ideal promotion underpromotion self-block nocapture nocheck umnov
KNNvkp
5 pieces.
- h#11
- longest mate
- h#7
- deepest unique
- 3
- positions at that depth
- h#6.5
- deepest dual
- h#6.5
- deepest strict dual
- 278,947,081
- positions with a helpmate
- 3,792,438
- with a unique solution
- 355,074,048
- cells in the plane
- 161,602,885 bytes
- on disk
Deepest unique problems
h#7
8/8/Kp6/8/7N/8/7N/7k b - - 0 1
- b5 Nf5 b4 Kb5 b3 Kc4 b2 Kd3 b1=R Ke2 Rb2+ Kf1 Rxh2 Ng3#
pure model ideal promotion underpromotion switchback self-block single-piece single-piece:black umnov
h#7
7k/4N2p/8/7N/8/8/8/K7 b - - 0 1
- h6 Nf4 h5 Kb2 h4 Kc3 h3 Kd4 h2 Ke5 h1=R Kf6 Rh7 Nfg6#
set-play pure model ideal promotion underpromotion excelsior excelsior:black closed-walk self-block single-piece single-piece:black nocapture nocheck umnov
Deepest dual problems
h#6.5
7k/4N3/8/4p3/8/2N5/1K6/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb3 e4 Kc4 e3 Kd5 e2 Ke6 e1=R+ Kf7 Rh1 Kf8 Rh7 Ng6#
- Ncd5 e4 Kc3 e3 Kd4 e2 Ke5 e1=R+ Kf6 Rh1 Nf4 Rh7 Nfg6#
pure model ideal promotion underpromotion self-block single-piece single-piece:black nocapture
h#6.5
5N1k/8/8/4p3/8/2N5/1K6/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nb5 e4 Kc3 e3 Kd4 e2 Ke5 e1=R+ Kf6 Rg1 Nd6 Rg8 Nf7#
- Nd5 e4 Kc3 e3 Kd4 e2 Ke5 e1=R+ Kf6 Rh1 Ne7 Rh7 Nfg6#
pure model ideal promotion underpromotion self-block single-piece single-piece:black nocapture
h#6.5
8/8/K6N/1p6/8/8/2N5/7k w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ng4 b4 Kb5 b3 Kc4 bxc2 Kd3 c1=B Ke2 Bf4 Kf1 Bh2 Nf2#
- Nf5 b4 Kb5 b3 Kc4 bxc2 Kd3 c1=R Ke2 Rc2+ Kf1 Rh2 Ng3#
pure model ideal promotion underpromotion switchback self-block single-piece single-piece:black umnov