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Jean-Louis Cazaux wrote on Tue, Apr 19, 2022 04:56 PM UTC in reply to Gerd Degens from 04:28 PM:

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.

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