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6.11 Unstable Seki: Capturing Half a Group

Dia. 6-16-1 is an example in which Black can capture one of the two strings of white stones. Let's play this out by territory rules I. Black has made the last move. After two passes to establish the preliminary end of the game, White plays 1 in Dia. 6-16-2. Black plays 2, and the exchange through White 9 follows, after which Black has to give White one more stone by the rule of equal numbers of moves. Dia. 6-16-3 shows the final result. Black has thirteen points of territory minus seven prisoners: total six. White has seventeen points of territory minus eight prisoners: total eight. White wins by two points.

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Dia. 6-16-1 Dia. 6-16-2 Dia. 6-16-3

White also wins by two points under area rules III. How this position should be resolved under traditional territory rules is a problem, but if it is played out, again White wins by two points.

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