(;
AB[nm][mn][pn][qn][ro][rp][rq][rr][np][nq][lq][oq]
AW[oo][po][qo][op][qp][qq][qr][pq][or][rs]
C[Black plays.]
(;
B[nr]
C[Looks natural, but slack.];
W[os]
(;
B[ns]
C[Black can block here, but ends in gote.]
PL[B];
B[ps]
C[For example, if White tenukis and Black throws in here, ...];
W[pr]
C[... White can make a 2nd eye.]
)
    (;
    B[ps]
    C[Throwing in immediately doesn't help.];
    W[pr]
    C[White can connect here.  Now, closing off the bottom is gote for Black.]
    TR[ns]
    )
)
    (;
    B[ps]
    C[Good timing.];
    W[qs]
    C[White must connect on this side.];
    B[nr];W[os];B[ns]
    C[Now Black can atari to close off the bottom edge in sente.];
    W[pr]
    )
)

