Life In 19x19

Can someone confirm or deny for me that this is seki? The surrounding black stones can't be captured:

I am playing black and I have lost the game either way.

Nope, it's a special situation called bent four in the corner, so white is dead (or black can kill by ko at the end of the game).

http://senseis.xmp.net/?BentFourInTheCorner
http://senseis.xmp.net/?BentFourInTheCornerIsDead

The white stones are dead in a bent four. Look it up in SL - there is lots of information about it.

Ugh, this one still catches me out. Good job I wasn't the first one to see this thread.

OK. I see that there are good instructions for follow-through in the second link.

Thanks for the replies!