That was Rbyka's first (and immediate) choice and the only thing she saw that gave Black an edge in the position (-.21 initially) The longer she looked at the move the more she liked it.
18: ...Ne5!
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Sorry...just imitating my hero, Larry Kaufman 
He always refers to Rybka in the feminine.
Looks like Black lost his advantage after 30 ...f6 (allowing the Knight sac and the perpetual) ?
Could have been a win for Black?
How about Kamsky's move against Nakamura?!