Grando
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Kostya obviously knew about this beforehand, as they discussed it privately.
Then why wasn't there a disqualification from the judge? Why wasn't the player who was deliberately ruining the games disqualified?
Dark's style is known (almost) to everyone who has played against him. There was no need to debate – a disqualification should have been issued immediately. And a ban should have been applied after the first instance.
Kostya, what is the point of your behavior and decision?