Game analysis #7 - Losing a playable endgame

Freehealthcare published this game on the forums, asking why he lost the endgame, as it did not look so bad. Well, the main reason was apparently a misplaced rook on b2 that got into trouble. 

We all have heard that we should develop our rooks on open and semi-open files, but why? There is a simple logic behind it: we want to give them more mobility, i.e. more squares to move to. In that game, White doubled his rooks on a semi-open file, but as it happened, it did not give the rooks more mobility, quite the contrary: the b2 rook got stuck without any squares. 

For the readers: If you have played any interesting games recently and need some help with the analysis, please post it in a comment here with your own notes, and I will be happy to give you some advice. 

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