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Apothecary Chess-Modern. Large board variant obtained through tinkering with known games.[All Comments] [Add Comment or Rating]
🕸Fergus Duniho wrote on Tue, Jun 16, 2020 02:08 AM UTC:

The castle subroutine contains these lines: 

  move #to #from; // Temporarily undo King move
  if sub checked #from:
    die A King may not castle out of check.;
  endif;

And before it ends, it includes this line:

  move #from #to; // Redo King move