(;
AB[qm][qn][qo][rm][sm][pp][pq][nq][or]
AW[rn][ro][qp][qq][qr][pr]
C[Black plays.]
(;
B[rp]
C[The killing move.];
W[rq]
(;
B[sr]
C[The vital point.]
(;
W[sp];B[sn];W[ps];B[rs];W[rr];B[so]
C[Black can create a bent-four in the corner at any time, so White is dead.]
)
    (;
    W[sq];B[so];W[sp];B[sn]
    C[White has only one eye.]
    )
)
    (;
    B[sn]
    C[Bad timing.]
    (;
    W[sr]
    C[White takes the vital point.];
    B[rs];W[sp]
    TR[sq]
    C[Now White has a 2nd eye at the marked point.]
    )
        (;
        W[sp]
        C[Mistake.];
        B[sr]
        C[Black transposes into the killing line.]
        )
    )
    (;
    B[rs]
    C[Fails.];
    W[sp]
    (;
    B[sn];W[so];B[sr];W[rr]
    )
        (;
        B[sr];W[sn]
        (;
        B[sq];W[ps]
        )
            (;
            B[ps];W[qs];B[sq];W[os]
            )
        )
    )
)
    (;
    B[sn]
    C[Too slow.];
    W[rp];B[rr];W[rs];B[sr];W[sq];B[so];W[ps];B[sp];W[rq]
    C[White lives.]
    )
    (;
    B[sr]
    C[Fails.];
    W[rp];B[rr];W[rs];B[ps];W[sq]
    C[White lives.]
    )
    (;
    B[so]
    C[Fails.];
    W[rp];B[sn];W[sr]
    )
)

