Antichess Solution Explorer

r n b q k b n r p p . p p p p p . . p . . . . . . . . . . . . . . . . . P . . . . . . . . . . . P P P P . P P P R N B Q K B N R
MoveScore# Positions
♘h6#-36Loss3 461 786
a6#-36Loss2 335 086
c5#-34Loss1 113 014
g5#-31Loss34 264
d5#-30Loss45 233
♘a6#-29Loss527 221
b5#-28Loss796 878
♕a5#-27Loss202 871
f5#-24Loss223 755
h6#-23Loss126 975
♕c7#-23Loss40 338
♕b6#-22Loss24 366
h5#-21Loss5 000
b6#-20Loss5 774
f6#-20Loss5 127
a5#-18Loss5 239
e6#-16Loss76
g6#-16Loss67
♘f6#-16Loss63
e5#-16Loss57
d6#-16Loss38
1. e3 c6 2. e4
— Andryushkov DefenceSteenhuis's Proof
Open on Lichess

The site features solutions for some antichess openings, providing a path that White or Black can follow so as to defeat any defense. The solutions will be gradually updated and supplemented.

The solutions of Mark Watkins, Klaas Steenhuis, and Cătălin Frâncu were partially used. Pierre Caetano's suggestions regarding reducing the maximum winning length are included in 1.f4, 1.♘c3, 1.e3 f6, and 1.e3 b5 lines. Credit to Vladica Andrejić for most of the opening names and their proof status. Pedro Re's suggestions regarding reducing the maximum winning length are included in 1.a3, 1.h3, 1.c3, 1.b4, 1.♘c3, 1.h4, 1.f4, 1.♘f3, 1.c4 ♘h6, 1.c4 b5, 1.e3 c6, 1.e3 b5 2.♗xb5 ♗a6, 1.e3 c5, and 1.e3 b5. Yabba's suggestions are included in 1.h3, 1.e3 g5, 1.e3 ♘c6, 1.e3 c5 2.♗b5 e6/a5/b6/♕c7/♕a5/Nh6, and 1.e3 b5 2.♗xb5 e6 3.♗xd7 ♗xd7 4.♘h3 ♘e7. Awkwardmammal's suggestions are included in 1.e3 b6, 1.e3 g5, and 1.e3 a5. Thanks to ChessDemon989 for his help with comprehension of the technical aspects of Watkins solutions and the factoradic in the context of its application to endgame tablebases.
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