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H. G. Muller wrote on Thu, Dec 17, 2020 11:10 PM UTC in reply to Greg Strong from 10:13 PM:

Indeed, there is no way to specify it in the Applet. Making it automatic would solve that. Except that there isn't really a way to specify 'rotate' symmetry either. But I suppose you could use 'none'.

The easiest way is probably to generate tables for a symmetric King, and then change one of the castling distances by editing the generated code. The tables get comments to indicate what piece they are for, and you will easily recognize that castling range in the King section. E.g. for O2 castling you will get something like

1  1  0  1     3 // king(84)
1  1  1  1     3
1  1  1  0     3
1  1  1 -1     3
1  1  0 -1     3
1  1 -1 -1     3
1  1 -1  0     3
1  1 -1  1     3
2 99  1  0    72
   1  2  0     9
2 99 -1  0    72
   1 -2  0     9

just change the -2 on the last line to -3 to get 3-step Q-side castling.


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