Ko fight example from a pro game - 10

    Keywords: Ko
[Diagram]

Starting position

White has cut at W1

[Diagram]

Standard

Normally we capture the cutting stone but here White would save four stonesin sente and capture two in the process.

[Diagram]

Ko - resolved

In the game, W3 skillfully creates a ko up to W7. Then B8 takes the ko first, W9 is the ko threat and B10 resolves the ko immediately.

[Diagram]

Ko fight

Suppose B2 responds, then W3 recaptures. Whichever Black's threat comes next (conveniently chosen as a big point B4 here), White enlarges the ko at W5. Black can hardly fight this ko and will (eventually) cover at B6. White can then connect with W7 at black+circle in sente because below there's a liberty race going on.

Eventually White can return to Black's threat with W9 while having greatly enhanced her strength in the upper right.


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