(;
AB[kc][dd][od][qd][dj][cn][no][oo][po][jp][mp][op][nq][pq]
AW[pg][pj][qm][qo][qp][dp][pp][gq][lq][oq][or][pr]
PL[W]
C[Black has just jumped to the marked point, which is not a proper move.

But how should White respond?

Source:
    American Go Yearbook 2004, p. 10
    Game between 1 dan and 1 kyu.
    Commentary:  Yilun Yang 7P]
TR[jp]
(;
W[kp]
C[In the game, mistakenly played this kosumi.];
B[ko]
C[Black's hane effectively blocks White.];
W[jq];B[jo]
C[Connecting here is a good defense.  Black has closed off White's access to the center, and White has a low position on the bottom.]
)
    (;
    W[lp]
    C[Pushing up is the correct response.];
    B[lo];W[ko];B[kp]
    C[Black can try to cut off White, but ...];
    W[ln];B[mo];W[mr]
    C[White separates Black's stones, and both of Black's groups are weak now.]
    )
)

