Trick play example 5

How to defend?  

White played yose moves on the right and now Black comes with a counterattack with a marked stone. Defending at a is a natural move, it is as efficient as anything else but it looks tasteless. Defending at b is even worse. So I planned to play as in the next diagram.

Setting a trap  

White 1 actually does not give more points than a at the previous diagram and leaves a ko-threat, but it sets a trap for the opponent. I wonder how many would buy it.

White captures a stone  

And now if Black takes three stones the corner dies. We know that already.

I think that since this position may happen in any game, everybody should learn how to kill the corner. The answer is in joseki-related life-and-death example 2.