Calculation vs. Evaluation

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Although they go hand-in-hand, it's been my experience that in a typical OTB game, often the result is decided by somebody underestimating or overestimating a certain line.  Both sides saw the variation, but the resulting position was a little bit unclear and one side correctly determined it favoured themselves.  If that makes sense...

 

Here's the kind of position I'm talking about.  Is Bxg3 a good move? 

 

 

I'll let you guys argue about it for a few hours before I post the answer!

MapleDanish
NM Matt Nicholson

"The ability to work hard for days on end without losing focus is a talent. The ability to keep absorbing new information after many hours of study is a talent." - Garry Kasparov