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This item is a reference work
It belongs to categories: Orthodox chess, 
It was last modified on: 2017-06-03
 Author: Fergus  Duniho. Programming Piece Movement in Game Courier. A tutorial on two different ways to program piece movement in Game Courier.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2018-10-29 UTC

The Bishop in Caissa Britannia had used this code:

def B checkleap #0 #1 1 0 and nor capture nor empty #0 empty #1 or checkride #0 #1 1 1;

Based on what I wrote earlier, this code is incorrect. In a test I ran, this code allowed the Bishop to make a non-capturing orthogonal move, but it did not display it among the available legal moves. So, it seems to be working for actual moves, but it is not working for potential moves. With that in mind, I have changed it to this:

def B checkleap #0 #1 1 0 and cond empty #0 not capture empty #1 or checkride #0 #1 1 1;

Running the same test, this code worked correctly for both potential and actual moves.