(;
AB[rc][qc][qb][pc][oc][nc][mc][mb][ma]
AW[la][lb][lc][ld][me][oe][ne][pd][qd][rd][sc][sb][rb][qa][pb][na]
C[Black plays.

Source:  British Go Journal #126]
(;
B[ob]
C[At first glance, Black seems to have at least a ko.];
W[pa]
C[White avoids the ko, but ...];
B[ra]
C[... White seems to be in a liberty shortage.];
W[oa]
C[But White dodges here to force a dead shape!];
B[nb];W[pa]
C[The throw-in keeps Black to only 1 eye.];
B[oa];W[qa]
C[Black dies.]
)
    (;
    B[ra]
    C[The only move that works.];
    W[oa]
    (;
    B[pa]
    C[This ko for life is the best that Black has.]
    )
        (;
        B[ob]
        C[Trying to avoid the ko is too greedy.];
        W[pa];B[nb];W[pa];B[oa];W[qa]
        C[Black dies.]
        )
    )
    (;
    B[pa]
    C[Bad timing.];
    W[oa];B[ra]
    C[Now the throw-in is too late.];
    W[pa]
    C[White again forces this dead shape.];
    B[ob]
    C[If Black plays on the inside, White doesn't even need to respond.];
    B[nb];W[pa]
    C[White plays the throw-in to kill.];
    B[oa];W[qa]
    )
)

