GokyoShumyoSection5Problem12/Solution

Second-line throw-in first  

a and b are miai. Black string is saved. This is the original solution. But...

Refuted  

...White wins by this block instead of above (unless outside complications at a work).

Variation 1  

connect is wrong.

Variation 2  

block is easily refuted by .

Wrong order of play  

is a weak order of play. secures an eye and prevents oiotoshi more easily (compare with Variation 2 above).