I try to follow. So a Rook cannot go from a4 to 4. And I understood that if there is a piece on a4, it is not possible to have another piece on 4.
At the end I wonder if this game is simply playable. I wouldn't be able to explain it to anyone I'm afraid.
I'm pretty sure that it would be possible to build something interesting on Gernd's idea by melting the cells a4 & 4, as well as h5 & 5. Which was similar to HG's diagram.
Doing this
only 1 piece allowed on a4/4 or on h5/5
a Rook on a1 would threat up to b8 AND a8 (as wished by Gernd)
a Rook on h4 would threat up to a4/4
a Bishop on d1 would go up to a4/4
a Bishop on a4/4 would either go to f8 (keeping the color) or to d8 (switching the color).
a Knight on a4/4 could go to b6, c5, a6, c6, b3, a2, b2, c3 (interesting)
Chess 66 would have 64 cells which is maybe the real problem.
I try to follow. So a Rook cannot go from a4 to 4. And I understood that if there is a piece on a4, it is not possible to have another piece on 4.
At the end I wonder if this game is simply playable. I wouldn't be able to explain it to anyone I'm afraid.
I'm pretty sure that it would be possible to build something interesting on Gernd's idea by melting the cells a4 & 4, as well as h5 & 5. Which was similar to HG's diagram.
Doing this