(;
AB[ds][es][dr][fr][bq][dq][fq][gq][hq][dp][eo][en][fn][gm][hm][il][dk][cj][kl][ip][kq][ml]
AW[cr][er][cq][eq][cp][ep][fp][gp][bo][do][go][dn][gn][hn][in][fl][gk][jn][ln]
C[White plays.];
W[fm]
C[Of course, White has to cut here, but how does White follow up?];
B[em]
(;
W[el]
C[Pushing from behind here is too slow.];
B[dm];W[dl];B[cm];W[cl];B[bn]
(;
W[co];B[bl]
C[Black connects out up the left side.]
)
    (;
    W[bm]
    C[Even worse.];
    B[co]
    C[Black captures 2 stones to save the center left group.]
    )
)
    (;
    W[dl]
    C[The correct tesuji to stay ahead of Black's 4 stones.];
    B[dm];W[cl];B[cm];W[bl]
    C[Now White has time to run ahead to block Black's escape.];
    B[el];W[ek];B[ej];W[fk]
    (;
    B[bm];W[am];B[an];W[al];B[bn];W[ao];B[co]
    C[Black can catch the 2 stones in a snapback, but ...];
    W[fo];B[cn];W[do]
    C[... White captures the entire cutting group in a snapback.]
    )
        (;
        B[bn]
        C[Now this snapback threat doesn't work.];
        W[co]
        C[Black's stones can no longer connect out.]
        )
    )
)

