Instructive Endgame Loss

Dec 28, 2011, 6:10 PM |
This is the endgame from an earlier blog.  The game itself was pretty undramatic, but the endgame was extremely instructive, at least for me.  If you were Black, 
what would you play on move 30?  The move I played seemed natural and obvious, but appears to lose by force.  What do you think?