you got it wrong. 13... a6 ? is not a fat error, just a mistake

edit

13...a6? 14.Nh5 Rfd8! 15.Nxf6+ Bxf6 16.Bxf6 gxf6 17.Rf3 leads to a dangerous position but not lost at all. the lost move is 14...Nxh5?? Bauer played that to avoid that previous dangerous position but didn't see 15.Bhx7!!

by the way it is subjective if a 'lost' move can be called a blunder if the forced reply is a brilliant move — Preceding unsigned comment added by Mdtr (talkcontribs) 17:16, 15 January 2011 (UTC)Reply