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Game Courier. PHP script for playing Chess variants online.[All Comments] [Add Comment or Rating]

🕸💡📝Fergus Duniho wrote on Wed, May 29 07:35 PM UTC in reply to Fergus Duniho from 04:13 PM:

// Keep all legal moves except the e Pawn's double move
set lglmvs ();
for v $legalmoves:
  if != #v "P e2-e4":
    push lglmvs #v;
  endif;
next;

setsystem legalmoves #lglmvs;

With the fix I made to unless, described here, this can all be done with one line:

setsystem legalmoves aggregate lambda (#0 unless == #0 "P e2-e4") $legalmoves;