Help to analyse this endgame (Csom Istvan (2530) vs. Glek Igor V (2505))

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Morisien

I'm trying hard to find  why Black would resign in this match but I still can't find a reason. I've tried engine analysis but most give a slight advantage to Black. Here is a link of the match :

 

http://www.chess.com/games/view?id=458502