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I'm trying to learn 3-D chess by playing Parmen against the computer. I've read the tournament rules and am fairly confident I've got a good, basic understanding of the game. However, in my first game, I've quickly encountered a situation where the program is telling me I'm trying to make an illegal move which I think would be legal.

The moves so far (I'm playing white):

  1. a4N, Nc6N
  2. c4N, Nb6N
  3. Nb3N, Nxc4N
  4. d3N, N4a5B

The move I'd like to make now is Nxa5B, but I'm alerted that it is an illegal move. Can someone explain to me why this is?

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Welcome to B&CG! –  Pat Ludwig Feb 24 '12 at 0:51
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@Iszi, would you mind using the full notation, and perhaps showing an image of the board (with the rank and files) showing the board position just before the illegal move? –  user1873 Feb 24 '12 at 5:09
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@user1873 The notation above is the same notation that is output by Parmen and, according to my understanding, is in alignment with the notation used in tournament rules. Getting a solid screenshot that effectively shows the position of all the pieces on all levels of the board is a bit tricky. –  Iszi Feb 24 '12 at 5:16
    
Also, I've quit the game in question and am not sure if I can reliably reproduce it with this particular software. –  Iszi Feb 24 '12 at 5:23
    
Just a display of the screen? –  CapelliC Feb 25 '12 at 22:17
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1 Answer 1

Your King is in check from your opponent's Queen.

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While I can't put together a visual representation to check this at the moment, this does sound about right now that I think about it. It probably never occurred to me before, because I'm so accustomed to the King & Queen being in the center of their row. –  Iszi Feb 24 '12 at 13:32
    
@Iszi, I am considering putting a visual together myself. I had to look back and forth at the Tournament Rules with the board visual and your move list to try to see the board in my mind. –  user1873 Feb 24 '12 at 14:22
    
Well, drat. I was going to attempt reproducing this in Parmen tonight, but now the program's going all crashy on me. –  Iszi Feb 25 '12 at 4:22
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