Gokyo Shumyo, Section 1, Problem 1 / Solution

Main line  

This problem is an illustration of the proverb: "In a symmetrical position, play the symmetric point".

White must play in order to live. Any other move fails.

and only go to show that White makes eyes at the marked points. and should be held in reserve as ko threats. Please note that they are loss making threats.

Var 1  

fails.

After , White needs both a and b. White can't play two moves in a row, so her group is dead.

White starting a also fails; it is the mirror image of .

Var 2  

and make a bent four in the corner shape, killing White. We assume that White can't escape at a.