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Atomic castling with touching kings #176
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This paper, written by FICS player Rekursiv, outlines all atomic rules as employed on FICS, and Lichess is using the same ruleset.
Quoting the paper:
Now consider this position: https://lichess.org/analysis/atomic/8/8/8/8/8/8/5k2/R3K2r_w_Q_-
Lichess allows O-O-O in here, which is inconsistent with this ruleset ("illegal [...] if moving the king one square closer to the rook (with the rook staying put) would place you in atomic check").
(Note that, when changing this, we must ensure that O-O-O stays valid in https://lichess.org/analysis/atomic/8/8/8/8/8/8/4k3/R3K2r_w_Q_- - Lichess correctly allows O-O-O in here.)
cc @niklasf
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