(;
AB[pq][qp][qo][pj][pd][pe][pc][oc][ob][kd][dd][de][cf][bf][ef][ec][cc][cb][jp][co][do][cm][cl][bk][lc][mc][nd][lb][jd][jc][jb][fe][eg][eh][ei][ej][dj][dk][el][fl][em][cn][eo][pn]
AW[cp][dq][ep][po][qn][qf][qd][qb][qc][pb][nc][dc][bc][cd][ce][be][df][dg][cg][bg][dm][dl][ck][kc][ld][mb][md][ke][je][ie][hd][hg][fh][fi][fj][fk][ek][gl][cj][ci][bo][bn][fp][pk]
C[Black's response to the marked stone?

Source:
    "Go World", #31, Spring 1983, p. 25
    Kobayashi Koichi  vs.  Hane Yasumasa, 7th Kisei Stage 2 Final
    Iwata Tatsuaki commentary.]
TR[pk]
(;
B[oj]
C[Too solid.  White settles his group
nicely in this sequence from the game.];
W[ok];
B[nj];
W[on];
B[pm];
W[om];
B[oo];
W[no];
B[pp];
W[mn];
B[mq];
W[qm];
B[lj];
W[pl]
)
    (;
    B[ok]C[Correct.]
    (;
    W[pl]C[If White reinforces against the right side...];
    B[on];
    W[qj];
    B[ol];
    W[qi];
    B[jm]
    C[Black expands his bottom area.]
    )
        (;
        W[ol]C[If White tries to maintain center presence...];
        B[on];
        W[ql];
        B[oj];
        W[ml];
        B[mj];
        W[mn];
        B[mp]
        C[... Black attacks the whole group.]
        )
    )
)
