(;
AB[dq][dp][eo][fn][em][dm]
AW[dn][en][do][fm][fl][hm][go][ep][eq]
C[Black plays

Source
    Tesuji, Ch. 5, p. 95,
    James Davies, Ishii Press]
(;
B[co]
C[The wrong direction.];
W[cn];B[bn];W[cm]
(;
B[bm];W[cl]
TR[dm][em][fn][eo]
C[Black takes the corner along with some territory.  But White's capture of the marked stones and enormous outside influence is a Black loss.]
)
    (;
    B[cl]
    C[Also unsatisfactory for Black.];
    W[bm];B[am];W[bl];B[bk];W[fo];B[al];W[gn]
    LB[bo:A][ck:B]
    C[Black cannot protect the 2 crucial cutting points at A and B.]
    )
)
    (;
    B[cn]
    C[Correct.  The loose ladder from this direction works much better.];
    W[co];B[bo];W[cp];B[cq];W[bp];B[ap];W[bq];B[br];W[fo];B[aq];W[gn];B[bm]
    C[Black doesn't make any appreciable territory, but Black connects the side and corner stones.  As a result, Black reduces White's left side influence from that in the other lines.]
    )
)

