(;
AB[co][cp][eo][ho][gp][bq][br][hq][iq][jq][nq][dr][er][jr][es][is]
AW[cq][dq][eq][fq][gq][cr][cs][hr][ir][ds]
PL[W]
C[White's best sequence?

Source:
    Go World #21, pp. 55-6]
(;
W[fr]
C[This atari doesn't work.];
B[hs];W[fs];B[er]
C[White has only one eye.]
)
    (;
    W[hs];B[gr];W[js];B[gs];W[fr];B[is];W[fs]
    C[You may have read to here to conclude that White seems to have nothing.]
    (;
    B[er]
    C[But if Black destroys White's living shape, ...];
    W[hr]
    C[... White catches the 2 stones in a liberty shortage using the marked stone!  White lives.]
    TR[js]
    )
        (;
        B[ks]
        C[Because of the previous variation, Black has to protect the bottom edge stones.];
        W[er]
        C[But then White lives anyway.]
        )
    )
)

