Capture two, recapture one / Discussion

2005 June 27

Bill: While sending two, returning one may be an instance of capture two, recapture one, it has its own peculiar flavor relating to seki and superko. So I think it deserves its own page, linked from capture two, recapture one. The same goes for sending three, returning one. In a similar vein, a two-stage ko is an instance of ko, but deserves its own page.

unkx80: Until you pointed out that there is a difference between the two, I did not realise there is one. May I ask whether the difference is that in sending two, returning one, the player whose two stones are captured must have deliberately played a self-atari move that caused the two stones to be captured?

Bill: As I understand it, yes. In the English phrase, one player sends two stones, giving them to the opponent, and then the opponent returns one stone in exchange.

[Diagram]

Sending two returning one.

W3 at WC

Like so.

OC, such play would be ridiculous here. ;-)

My sense of the Chinese phrase is that same player takes two stones and then returns one. Is that right?

unkx80: Thanks. And yes, the Chinese phrase takes the meaning of the more general capture two, recapture one phrase.

I'll fix this mess tomorrow, if not, the day after tomorrow.

Bill: OK, thanks so much. :-)

unkx80: Done.


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