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Chess 66. Board based on the 8x8 arrangement - with the difference that 66 fields are now available. (8x8, Cells: 66) [All Comments] [Add Comment or Rating]
Bn Em wrote on Tue, Nov 15, 2022 12:45 PM UTC in reply to Gerd Degens from 10:34 AM:

But why can't a bishop from d1 move to A4 and what am I still overlooking here?

It can; the discussion was whether a bishop can move from e8 could move onto both of a4 and A4, whereas it ought only to be able to move to A4; from f8 it could instead move to a4 but notA4`.

Should the description consider the following knight moves? Knight on b3, is the move to a5 possible, because on the same diagonal? Or a knight on a3, are the moves to a5 or b5 possible, because on the same line?

That depends on the definition of the Knight move: by the subtractive definition you and Fergus have used, those would be disallowed as a Queen could move to those spaces, as you've noted. Other definitions (such as the traditional ‘one orthogonal step then one step diagonally outward (or vice versa)’) would include those squares.

Which definition you prefer is in this case up to you