Comuter analysis bug

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giantguido

On a computer analysis on an online game, I got this:

19. a4?

 19. Qe2 Bxd320. Qxd3 Rf5 21. Ne4 Ne6 22. Kh1 Nd423. a4 Rf4 24. a5 Qf5

  

19. a4 c5c6 20. Ne4 Rf721. Nc3 Bxd3 22. Qxd3 Rf4 23. Ne2 Rf624. f4 exf4 25. Nxf4 )

I play black in this game. On the 'mistake line' (the last line), it says black moves c5c6 after 19. a4. How can black move his pawn from c5 to c6?

THEWHITEFOX

maybe it got it backwards