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I keep getting illegal move on the chess problem.. although my move is not illegal.

  [Variant "From Position"]
  [FEN "3k4/1p3Bp1/p5r1/8/P3P1N1/5Pp1/1P1r4/2R4K b - - 0 1"]
  
  1... Rgd6
When I put Rgd6 I get "d6 (Illegal move)"


I'm not sure if this is your problem, but you have to include captures (x), check (+) and checkmate (#) if applicable


Try Rd6 or Rd6+ for check.


Or Rd6++ for check mate


# is check mate, ++ is double check.




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