This looks like the relevant fix: https://github.com/lichess-org/scalachess/pull/154 https://github.com/lichess-org/scalachess/pull/154 (the broken code checke

This looks like the relevant fix: https://github.com/lichess-org/scalachess/pull/154 https://github.com/lichess-org/scalachess/pull/154 (the broken code checked that the only pieces on the king's path to its new position were kings and rooks of the appropriate color)