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The birth of 3 new variants - part 2 : Grand Apothecary Chess Modern[Subject Thread] [Add Response]
🕸Fergus Duniho wrote on Thu, Jul 8, 2021 04:32 PM UTC in reply to Aurelian Florea from 08:28 AM:
  1. The long cannon castle is not done entirely although the king moves correctly.

You don't seem to be unflagging spaces properly. I confirmed that you left the Rook's space unflagged by moving the Rook back after moving it and then castling with it. When the Rook's space remains flagged, you will not be able to castle with the Cannon. You should do as I do in Chess, which is to unflag every space moved to or from. The code used in Chess is 

unsetflag $origin $dest;