I've read one suggestion that he is 1700+, but I reckon he'd be stronger. There is a YouTube clip of Cornbread playing an 8 year old named John and his Dad has put the score in a blog. Cornbread starts out with weak moves, not wanting to crush a little kid, but he soon realises that the little fellow is quite good. Both players play quickly and Cornbread is a good speed player. Carlson played some Washington Square Park players and estimated their strength at 1800.
Is this guy good?
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http://www.youtube.com/watch?v=dF_MyCpBfBU
Cornbread I mean. He talks a lot, but he won in the end because of the time. Talking a lot is, according to mensa, a sign of genius.