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H. G. Muller wrote on Wed, Nov 9, 2022 07:18 PM UTC in reply to Fergus Duniho from 06:14 PM:

As I understood it only the second is correct. All moves are reversible in this game (except for Pawns, of course). The squares a3 and 4 have an edge in common, so going between those would be an orthogonal step, not allowed for a Bishop. Both 4 and a4 connect diagonally to b3, as they both have only a corner in common with the latter. (Not clear from the picture is that 4 and b4 share an edge.)

The Interactive Diagram I posted in the Chess69 topic thread (which has a similar switch) should show the correct moves for Bishops and Rooks. (Not for King, though!)


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