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It's interesting to note that in The Biggest Game in Town, Stu Ungar makes a dreadful call with KK when Perry Green bets twice the pot with an ace on board, and spikes a third king on the turn. There's no doubting that Ungar was a great player, but I think the myths about him are perpetuated by people who believe that 'Rounders' style hand reading is possible.
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That account of the action is wrong.
HERE is a link that explains play as it went down.
There are also several accounts of Ungar being able to read gin hands perfectly, and this being true, I have little doubts of his abilities at hold'em.
An excellent display of his playing can be seen in the video footage of the 1997 WSOP final table.