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This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2020-04-21
 By Daniel  Zacharias. Expanded Chess. An attempt at a logical expansion of Chess to a 10x10 board.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2020-07-03 UTC

You can screen those out with a line that rejects ferz moves. Here is a revision:

def Osprey fn (checkride #0 #1 1 1 and empty #0) 
  where #0 0 * 2 sign - rank #1 rank #0 
  #1 
  or fn (checkride #0 #1 1 1 and empty #0) 
  where #0 * 2 sign - file #1 file #0 0 
  #1
and not checkleap #0 #1 1 1
or checkleap #0 #1 2 0;