Gokyo Shumyo, Section 1, Problem 63 / Solution

Main line  

is essential to prevent Black from creating a bulky five inside White's eye space.

Variation  

If black plays , from behind is important...

White falls into the trap  

is a serious mistake. captures at , recaptures at , at makes the bulky five shape. White is dead.

Another Solution?  

ProtoDeuteric: I can't see why in this diagram would not work. I think that the above statement that can now make white's eye a bulky five is short sighted...

Continuation, at "a"  

ProtoDeuteric: With this sequence (which I believe is not katteyomi), white is alive and well.

LukeNine45: What about at ?

If at ( at "a")  

ProtoDeuteric: If of the previous diagram was instead played where was, then...well...looks like...no...wait...no...I guess you are right. In this variation of what has turned out to be a failed attempt, I misread where black would have played after .

Failure  

If White thinks to solve her problems by connecting, Black forces with , next creates the bulky five. is also important. Let's go into 2 and 6.

Var at 2 in failure diagram  

Making the bulky five immediately works too but requires a tesuji at .

Mistake at 6 in failure diagram  

It would be a grave mistake to play not at a. White captures at ...

Mistake at 6 in failure diagram  

White has a and b as miai to assure life.