Is the black group dead in this game state? (From Nick Sibicky's lecture #246)
Instead of S8, White can play T7. This may not work right away because White has some bad shape, but if he lets black crawl a few times - T5, S6, T6, S7, etc - and then blocks on the edge, the group doesn't gain any liberties. 

Like this:

$$Bcm1 
$$ |...,.....,
$$ |..........
$$ |..........
$$ |.XXX......
$$ |7OOOX.....
$$ |9OXXOO....
$$ |.OXO.....,
$$ |.OXOO.....
$$ |0X1X284...
$$ |.XXX356...
$$ +----------


Or this:

$$Bcm1 
$$ |...,.....,
$$ |..........
$$ |..........
$$ |.XXX......
$$ |.OOOX.....
$$ |.OXXOO....
$$ |.OXO.....,
$$ |.OXOO.....
$$ |.X1X246.8.
$$ |.XXX35790.
$$ +----------