This is an interesting semeai.
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[go]$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X O . . . |
$$ | . . . O . . . . . . . X . . X O . . . |
$$ | . . . , . . . . . , . . . . X , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . X . . . . . . |
$$ | . . . . . . . . . . X X . . . O . . . |
$$ | . . . . . . . . . . X O X X X O . . . |
$$ | . . . , . . . . O O X O X O X , O . . |
$$ | . . . . . . . . O X O O O O X X X . . |
$$ | . . . . . . . . . X X X O O O . . . . |
$$ | . . . . . . . O O X . X X O . X X . . |
$$ | . . . . . . . . O X O X X O O . . . . |
$$ | . . . . . . . . O O . O X X O . X . . |
$$ | . . . X . O O . . , O O X . O X X . . |
$$ | . . . . X X O . . . . O X . O X . . . |
$$ | . . . . . . . . . . . O X X O X . . . |
$$ | . . . . . . . . . . . O O X O X . . . |
$$ ---------------------------------------[/go]
There are 2 shared liberties, White has 4 outside liberties, and Black has, errh . . . , some outside liberties.
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[go]$$B Black plays first
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X O . . . |
$$ | . . . O . . . . . . . X . . X O . . . |
$$ | . . . , . . . . . , . . . . X , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . X . . . . . . |
$$ | . . . . . . . . . . X X . . . O . . . |
$$ | . . . . . . . . . . X O X X X O . . . |
$$ | . . . , . . . . O O X O X O X , O . . |
$$ | . . . . . . . . O X O O O O X X X . . |
$$ | . . . . . . . . 2 X X X O O O 1 . . . |
$$ | . . . . . . . O O X 6 X X O 7 X X . . |
$$ | . . . . . . . . O X O X X O O 3 . . . |
$$ | . . . . . . . . O O 4 O X X O 5 X . . |
$$ | . . . X . O O . . , O O X . O X X . . |
$$ | . . . . X X O . . . . O X . O X . . . |
$$ | . . . . . . . . . . . O X X O X . . . |
$$ | . . . . . . . . . . . O O X O X . . . |
$$ ---------------------------------------[/go]
Black fills White's 4 outside liberties while White fills Black's 3 outside liberties, for seki.
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[go]$$W White plays first
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X O . . . |
$$ | . . . O . . . . . . . X . . X O . . . |
$$ | . . . , . . . . . , . . . . X , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . X . . . . . . |
$$ | . . . . . . . . . . X X . . . O . . . |
$$ | . . . . . . . . . . X O X X X O . . . |
$$ | . . . , . . . . O O X O X O X , O . . |
$$ | . . . . . . . . O X O O O O X X X . . |
$$ | . . . . . . . . 1 X X X O O O 2 . . . |
$$ | . . . . . . . O O X 5 X X O 8 X X . . |
$$ | . . . . . . . . O X O X X O O 4 . . . |
$$ | . . . . . . . . O O 3 O X X O 6 X . . |
$$ | . . . X . O O . . , O O X 7 O X X . . |
$$ | . . . . X X O . . . . O X 9 O X . . . |
$$ | . . . . . . . . . . . O X X O X . . . |
$$ | . . . . . . . . . . . O O X O X . . . |
$$ ---------------------------------------[/go]
White fill 3 outside liberties for Black plus the 2 shared liberties while Black fill White's 4 outside liberties. White wins the semeai.
But wait! There's more!
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[go]$$W White plays correctly
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X O . . . |
$$ | . . . O . . . . . . . X . . X O . . . |
$$ | . . . , . . . . . , . . . . X , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . X . . . . . . |
$$ | . . . . . . . . . . X X . . . O . . . |
$$ | . . . . . . . . . . X O X X X O . . . |
$$ | . . . , . . . . O O X O X O X , O . . |
$$ | . . . . . . . . O X O O O O X X X . . |
$$ | . . . . . . . . 1 X X X O O O 2 . . . |
$$ | . . . . . . . O O X 7 X X O . X X . . |
$$ | . . . . . . . . O X O X X O O 4 . . . |
$$ | . . . . . . . . O O . O X X O 6 X . . |
$$ | . . . X . O O . . , O O X 3 O X X . . |
$$ | . . . . X X O . . . . O X 5 O X . . . |
$$ | . . . . . . . . . . . O X X O X . . . |
$$ | . . . . . . . . . . . O O X O X . . . |
$$ ---------------------------------------[/go]
White fills 2 shared liberties plus 2 of Black's outside liberties while Black fills 3 of White's outside liberties. White wins the semeai, and makes 1 more point of territory than in the previous diagram. Verrrry interesting.
When Black plays first
not only reduces White's liberties by 1, it also increases Black's liberties by 1.