On: Chess Investigation Finds U.S. Grandmaster ‘Likely...

[javajosh]

>never seemed like the guy to get petty and up and throw a fit

More than that, Magnus is a very fierce competitor and he doesn't withdraw from tournaments. He's 31 and this is his first withdrawal AFAIK.

[manimino → javajosh]

Magnus cares deeply about the image of chess as a sport. He has done a great deal to popularize chess. Cheating threatens the legitimacy of chess itself.

It makes sense that Magnus would take a stand on it, even if he risks losing face by doing so.