Helpmate tablebases Every solution to every position, precomputed.

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KRPvkb

5 pieces.

h#8
longest mate: h#7
deepest unique: 7
positions at that depth: h#7
deepest dual: h#5
deepest strict dual: 505,948,620
positions with a helpmate: 23,298,295
with a unique solution: 355,074,048
cells in the plane: 266,846,689 bytes
on disk

Deepest unique problems

h#7

6Rk/7b/8/8/8/8/1P6/2K5 b - - 0 1

Kxg8 b3 Kf7 b4 Ke6 b5 Kd5 b6 Kc4 b7 Kb3 b8=Q+ Ka2 Qb2#

promotion excelsior excelsior:white closed-walk single-piece single-piece:white single-piece:black

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

h#7

6Rk/7b/8/8/8/8/4P3/2K5 b - - 0 1

Kxg8 e3 Kf7 e4 Ke6 e5 Kd5 e6 Kc4 e7 Kb3 e8=Q Ka2 Qa4#

pure model mirror promotion excelsior excelsior:white single-piece single-piece:white single-piece:black nocheck umnov

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

h#7

8/8/8/K7/8/8/3P3R/6bk b - - 0 1

Kxh2 d4 Kg3 d5 Kf4 d6 Ke5 d7 Kd6 Kb5 Kc7 Ka6 Kb8 d8=Q#

pure model mirror promotion excelsior excelsior:white single-piece single-piece:black nocheck umnov

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

Deepest dual problems

Deepest dual with different first and last moves: h#5. The deepest dual overall is h#7, where the two solutions share a first or a last move.

h#5

8/8/8/8/4k3/3R4/1P6/K2b4 b - - 0 1

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

Bg4 Rd4+ Ke3 Rxg4 Kd2 Ka2 Kc1 Kb3 Kb1 Rg1#
Bh5 Rd5 Ke3 Rxh5 Kd2 Ka2 Kc1 Kb3 Kb1 Rh1#

pure model ideal

h#5

8/8/3k4/8/2R5/8/1P5b/K7 b - - 0 1

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

Bg1 b4 Bc5 Kb2 Kc6 Kc3 Kb5 Rxc5+ Ka4 Ra5#
Be5 Rc1 Bc3 Kb1 Kc5 Kc2 Kb4 bxc3+ Ka3 Ra1#

pure model ideal mirror

h#5

8/8/8/8/b5k1/5R1P/8/1K6 b - - 0 1

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

Kh4 Rf4+ Kg3 Rxa4 Kf2 Kc2 Ke1 Kd3 Kd1 Ra1#
Kh5 Kc1 Bd7 Kd2 Bxh3 Ke3 Bf5 Kf4 Bg6 Rh3#

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

Note: the side to move is in check in the diagram.