Helpmate tablebases Every solution to every position, precomputed.

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KQQvkq

5 pieces.

h#7
longest mate
h#5
deepest unique
441
positions at that depth
h#5
deepest dual
h#5
deepest strict dual
55,977,744
positions with a helpmate
8,189,677
with a unique solution
121,110,528
cells in the plane
51,697,366 bytes
on disk

Deepest unique problems

h#5

8/8/8/4Q3/8/8/4q2k/K4Q2 b - - 0 1

  1. Qxe5+ Kb1 Kg3 Qb5 Kf2 Kc2 Ke1 Kd3 Kd1 Qb1#

mirror

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

h#5

8/8/8/3Q4/7Q/1q4k1/8/K7 b - - 0 1

  1. Kxh4 Qxb3 Kg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#

single-piece single-piece:black

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

h#5

5Q2/8/8/8/6kQ/8/2q5/K7 b - - 0 1

  1. Kxh4 Qe8 Qg2 Kb1 Kg3 Kc1 Kf2 Kd1 Kf1 Qe1#

self-block nocheck

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

Deepest dual problems

Only one distinct idea exists at this depth: 2 positions share a solution.

h#5

4Qk2/8/8/8/8/8/4q3/QK6 b - - 0 1

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

  1. Kxe8 Qb2 Kd7 Ka2 Kc6 Kb3 Kb5 Kc3+ Ka4 Qb4#
  2. Qxe8 Kc2 Kg8 Kd3 Qe4+ Kxe4 Kh7 Kf5 Kh6 Qh8#

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

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