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[go]$$B Corner
$$ ------------------
$$ | T X X . . . . . .
$$ | X O . . . . . . .
$$ | O . . . . . . . .
$$ | . . . , . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]

Can white place on the triangle and capture one black stone even though the other two blacks have liberties? I assume it can because the capture leaves a liberty for the white stone making the capture. Ko prevents black from capturing right away, and white can then fill it.

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"Hell if you understand everything I said, you’d be me." ~ Miles Davis ~

You are correct in your reasoning.

Yes white may place on the triangle and capture one black stone.
And yes the Ko prevents black from capturing right away.

The only circumstance under which white could not capture the black stone is if...

Click Here To Show Diagram Code

[go]$$B ...the black stone has just captured a white one in the corner...
$$ ------------------
$$ | T X X . . . . . .
$$ | 1 O . . . . . . .
$$ | O . . . . . . . .
$$ | . . . , . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]

...in which case White can't immediately recapture because of ko.

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Poka King of the south east.