Gokyo Shumyo, Section 1, Problem 29 / Solution

Main line  

White can make a seki in sente.

Another variation  

ChrisRyan?: can also be played as hane, threatening to escape. The outcome after is very similar to the main line. Note that if is played at a, then Black can live outright.

Wrong 1  

White plays at the vital point.

Wrong 2  

Black 1 seems pretty vital too. However, two successive hanes and a placement kill Black.

Wrong 2 variation (inferior for white)  

An immediate placement with White 2 is inferior: Black has a ko now.

Wrong 3  

The hane creates a bulky five.

Wrong 3 (variation)  

Now a and b are miai.