Tsumego From Games 23 / Solution

unkx80: Since this is a relative easy problem, and a picture speaks a thousand words, there is probably no need to provide any descriptions to the diagrams. More discussion can be found in Tsumego From Games 23 / Attempts.

Solution 1.  

Solution 2.  

hnishy: Solution 2 is more correct, because the cutting point at 'a' remains even after two White moves in a row (resulting from a ko fight).

Failure 1.  

Failure 2.  

Failure 3.