(;
AB[rq][qq][qp][pq][op][np][mq][mo][lp][lq][kq][lr][ks][hq][gr][gp][go][fp][eq][er][ho][hn][io][ip][kn][kl][cn][ck][dj][gj][gl][cc][cb][db][fc][be][jd][nd][pd][qe][re][qj][rj][pk][nk][nl][ol][pm][qm][rm][lg][jf]
AW[dr][dq][dp][cp][ep][en][fo][fm][gm][gn][hm][in][jm][jo][jp][kp][jq][jr][kr][ir][lo][ln][lm][km][no][nm][om][oo][po][pp][qo][rn][rp][ql][qi][pi][pf][qf][rf][mh][ld][bj][ch][df][dd][dc][ec][eb][fd][me][pb]
TR[pb]
C[Black's response to White's marked play?

Source:
    "Go World", #30, Winter 1982-83, pp. 34-35.
    Cho Chikun vs. Otake Hideo,
    7th Meijin Title, game 5]
(;
B[mc]
C[Bad.];
W[lc]
C[White can now build outside
influence.];
B[ne];
W[mf];
B[qc];
W[ie];
B[if];
W[hi]
C[With White's new influence, this
White shoulder hit splits Black's
top and left side groups.  One of
the two Black groups will die.]
)
    (;
    B[oc]
    C[Simple and correct.];
    W[ob];
    B[nb];
    W[mc];
    B[nc];
    W[qc];
    B[kc];
    W[rb];
    B[lc]
    C[White lives in the upper right
corner, but Black's attack against
White's right side group gives Black
satisfactory chances.]
    )
)
