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H. G. Muller wrote on Tue, Nov 7, 2023 09:22 PM UTC in reply to Fergus Duniho from 05:44 PM:

But since you don't have check, maybe putting the piece back on the board will not affect the evaluation of which moves are legal. In that case, it may not be essential to deal with it during the simulation of potential legal moves.

Indeed, this is exactly why it is sufficient to just do this at the very end of Post-Move. The preset was automated through the betza.txt include, not by fairychess.txt, so it needs different code to do that from what you give.

I run into a problem that I don't understand, though. The code I suggested, which Gerd put in the preset, relies on the variable 'victim' to contain the captured piece. But printing it shows it is always equal to @ at the end of Post-Move. Even when I print it directly after the only place in betza.txt where it is set:

  set victim cond != #desti #ori space #desti @; // no self!
print . #ori . , . #desti . , #victim;
print space #desti;

it prints @, both for #victim and space #desti:


d2,d4,@
@
e7,e5,@
@
d4,e5,@
@

But how can space #desti be @ on d4-e5 if the preceding move was e7-e5? I would have expected a Pawn there. The checkbox "Do Not Include Moves in Code" is ticked in this preset, so the Pawn should still be there.


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