Helpmate tablebases Every solution to every position, precomputed.

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KQRvkb

5 pieces.

h#7
longest mate
h#5
deepest unique
1,113
positions at that depth
h#5
deepest dual
h#4
deepest strict dual
142,198,375
positions with a helpmate
15,634,338
with a unique solution
121,110,528
cells in the plane
114,141,556 bytes
on disk

Deepest unique problems

h#5

7b/6Q1/8/8/8/8/6R1/K6k b - - 0 1

  1. Bxg7+ Rb2 Kg1 Kb1 Kf1 Kc2 Ke1 Kd3 Kd1 Rb1#

pure model mirror

Note: the solution begins with a capture.

h#5

8/8/8/8/6Q1/7k/8/1K2b2R b - - 0 1

  1. Kxg4 Kc2 Bg3 Kd3 Bh2 Ke4 Kh4 Kf5 Kh5 Rxh2#

pure model ideal mirror nocheck

Note: the diagram has no legal last move, so it cannot arise in a game.

Chosen from the first 500 of 1,113 positions at this depth.

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.

h#4

8/8/8/8/7R/5Qk1/8/2K1b3 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Kxf3 Kd1 Kg2 Ke2 Kg1 Kf3 Kf1 Rh1#
  2. Kxh4 Kd1 Bg3 Ke2 Kh3 Kf1 Kh2 Qg2#

single-piece single-piece:black nocheck zilahi

Note: the side to move is in check in the diagram; the solution begins with a capture.

h#4

8/8/8/5R2/8/3Qk3/8/3K1b2 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Kxd3 Kc1 Ke2 Kb2 Kd1 Kc3 Kc1 Rxf1#
  2. Bxd3 Rc5 Kf2 Kd2 Kf1 Ke3 Ke1 Rc1#

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

3R4/4kQ2/8/8/2b5/8/2K5/8 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Kxf7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh8#
  2. Kxd8 Qe8+ Kc7 Kc3 Kb6 Kxc4 Ka5 Qb5#

pure model mirror single-piece single-piece:black zilahi

Note: the side to move is in check in the diagram; the solution begins with a capture.