Teire/Attempts2

Problem 2  

Where must Black play te-ire?

underlying problem  

tderz: once the liberty at is gone,
White can capture at least the 4 left stones by atari-ing at .

Having said this,
any black stone at at any of the points occupied by to ,
or those a, b, which would pt , in atari,
would defend against this threat.

defending moves  

tderz: thus, the possible defending moves are: a to g.

Of these, g looks the least attractive,
b the most dangerous (3 ko threats);
a looks quite ok, as one is relatively safe from an attack at p (rests peep c with possible false eye b).
c has one 2 threats (f, d);
f might be in danger after peep c, then jump to p (defense b, q might cost points).

My conclusion: best answer depends on surrounding & actual game situation.

Bill: Yes, but don't you think that a will usually be best? d still allows two ko threats.