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Problem 6774
Counting Points, Amateur Game, Whole Board Positions

It's endgame, and a 1 point ko at t4/t5 has been rumbling on for a while. At this stage, black has captured one more white prisoner than white has of black (japanese rules, komi 6.5). For his next ko threat, white unleashes F5 (circled). Black to Play. Defend the threat, fill the ko, or play something else?

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