(;
SZ[13]
AB[bj][bk][bl][ck][dj][ej][ek][fl][gl][gk]
AW[al][bm][cl][dl][dk][el][dm][fk][fj][gj][hj][hk][ij]
C[Black plays.

Source:  "Tesuji", Ch. 4, pp. 54-55,
         James Davies, Ishi Press]
(;
B[ak]
C[Fails];
W[hl];
B[am];
W[gm]
)
    (;
    B[hl]
    C[Also fails.];
    W[il]
    C[White simply blocks, and wins
the capture race.]
    )
    (;
    B[fm]
    C[Not much better.];
    W[hl];
    B[hm];
    W[il];
    B[ak];
    W[im];
    B[am]
    C[White takes the bottom ko next,
and a double ko arises that Black
cannot win.]
    )
    (;
    B[gm]
    C[Better.];
    W[hl];
    B[em]
    C[Now Black has a ko, but White can
take first.]
    )
    (;
    B[em]
    C[Best.];
    W[fm];
    B[gm];
    W[hl]
    C[Now Black takes the ko first.]
    )
)
