(;
AB[lq][lr][ls][mq][nq][nr][or][pr][qr]
AW[lo][lp][oo][op][oq][jp][qp][qq][kq][kr][mr][ms][rr][ns][ps][qs]
C[Black plays.]
(;
B[os]
C[Capturing is obvious and incorrect.];
W[ms];B[rs];W[qs]
(;
B[rq];W[ss];B[ps];W[rp];B[rs];W[sq];B[sr];W[rq]
C[Black doesn't even have a ko.]
)
    (;
    B[sr]
    C[No better.];
    W[rq]
    C[Black has nothing but false eyes in the corner.]
    )
)
    (;
    B[rq]
    C[Trying to put White into a liberty shortage from the outside here doesn't work either.];
    W[ss];B[os];W[ms];B[rs];W[qs]
    C[Black has the same problem as the previous variation.]
    )
    (;
    B[sr]
    C[The clamp tesuji is correct.];
    W[rq]
    C[White can only pull back to wait.];
    B[rs]
    PL[B]
    C[Now Black has this throw-in for a ko, which is the best result for both sides.];
    B[os]
    LB[ms:A][qs:B]
    C[If Black has enough ko threats, Black can capture here to live.  A and B are miai for Black.]
    )
)

