Rectangular Eight In The Corner
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is the strongest attack. is the point to avoid ko. is necessary or White plays there (or to the right of it) to capture the corner. at or will also make a seki, but white would get an extra ko threat.
Nikok34 (KGS) : Can't in this position white can make a bent four in the corner with 1-1?
Nikok34 : Now I see why... thanks
at the 2-2 point invites an approach ko.
The Count: This isn't necessarily a mistake, is it? If White has one big ko threat and no others then White can't win the approach ko above, but can win the throw-in ko, and so Black will play and White will make seki which is better than nothing.
Conclusion for the endgame