I'm black and it's my turn. I'm playing in the Arena chess player against Stockfish. This is my current board:

[fen ""]
[startply "31"]

1. e4 d5 2. exd5 e6 3. dxe6 fxe6 4. Nf3 Nf6 5. Bc4 c6 6. O-O Bc5 7. d4 Bb6 8. Re1 O-O 9. Nc3 Nbd7 10. Ng5 Ne5 11. dxe5 Qxd1 12. Nxd1 Ng4 13. Nxe6 Bxf2+ 14. Nxf2 b5 15. Bb3 Nxf2 16. Nc7+

I want to play Rb8:

1rb2rk1/p1N3pp/2p5/1p2P3/8/1B6/PPP2nPP/R1B1R1K1 w - - 2 17 

but I keep getting errors telling me that's illegal.


  • 5
    You are in check and have to resolve that first.
    – fuxia
    Commented Mar 11, 2020 at 23:09
  • Oh cripes. Yeah my bad. Thanks Commented Mar 11, 2020 at 23:15
  • 3
    For future reference, notice in that notation, after Nc7, there is a plus sign. That plus sign is chess notation for "check". Commented Mar 11, 2020 at 23:28
  • By the way, just because it is obvious to experienced players, that does not mean it is obvious to true novices, and thus, please keep your downvotes to yourself. It is not a bad question just because you think it is easy. Commented Mar 12, 2020 at 14:42

1 Answer 1


It turns out I was in check: 

enter image description here

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