Starting position  

What is the point of black playing at a when white can capture that stone later? Let's discuss:

More on the effect on thecorner


Let's look at three options. a, b and tenuki.


If Black at B1 here, B3 can play tenuki. W4 ends in gote. Later there is the alphabetized endgame.

(Of course, if black is komaster, black could respond to white a with black c. But in general, black has to draw back to b because white will have little to lose in the ko.)


If Black does not play tenuki, he ends in gote. We can expect White a, Black b, White c in the late endgame.

(When compared with the sente diagram above, B3 here is worth only about 9 points in gote. Before yose, this is relatively small, so tenuki is most likely a better option.)


Black gives up the possibility of tenuki and ends up in gote anyway. In the endgame we can expect Black a White b Black c.


If Black plays tenuki, W1 can be sente.

The third part may be explained elsewhere already

AddASecondStoneAndSacrificeBoth/continuation last edited by xela on February 20, 2009 - 06:38
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