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According to Zhao Baolong 2p China, see
http://home.snafu.de/jasiek/c2002com.pdf under Comments for Forbidden Repetition, in 100% of all professional Chinese tournaments, it is a tie.
This is meaningless unless you define what you mean by a tie (which also may not be what other people mean), but if you are maintaining that all Chinese pro tournaments handled triple ko in the same way, that is plain wrong. In the weekly Weiqi League Division A replays are normal, but in the B Division, which takes place as a single time-crowded event, triple ko has been counted as a half-point draw.
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Has there ever been a superko battle in a professional game? Sensei's Library says Chinese rules allow superko, is this true? Has it ever happened?
Yes. Gu Li lost a game because of the special superko rule in an Ing-rules tournament, with a triple ko.