Construction Problem 2

    Keywords: Problem

ferdi: I saw this problem in "Deutsche Gozeitung", contributed by Tobias Berben, I think.

[Diagram]



On a 9x9 board, what is the smallest (= fewest stones) living group when you have to construct it only with diagonal moves?

[Diagram]


a diagonal move

Tas: Note: It has to be unconditionally alive, alive even if black passes for the rest of the game.

Solution


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