(;
AB[no][oo][po][qo][lp][lq][lr][ls][mp][rp][rq][rr][qr][qs]
AW[np][op][pp][qp][mq][mr][ms][qq][pr][ps]
C[Black plays.]
(;
B[oq]
C[Throwing in here doesn't work.];
W[or]
C[White easily makes eye shape to live.]
)
    (;
    B[nq]
    C[Cutting here doesn't work either.];
    W[nr];B[oq];W[pq]
    C[White lives.]
    )
    (;
    B[or]
    C[Another obvious move.]
    (;
    W[os]
    C[Best defense.]
    (;
    B[nq]
    C[Nice move!  With a liberty shortage, White has no response.

Later, if removing White's stones is necessary, Black can throw in at A or B for a snapback.]
    LB[ns:A][pq:B]
    )
        (;
        B[oq]
        C[Mistake.];
        W[nr]
        C[White lives with territory.]
        )
    )
        (;
        W[oq]
        C[A vital point, but makes Black's job easy.];
        B[os]
        C[White collapses.]
        )
    )
)

