(;
AB[dd][ed][ec][ee][df][gd][ge][he][hc][id][ib][jc][pd][qc][qb][od][oc][nb][qh][pl][pn][pq][op][mq][lq][cq][bq][dp][ep][fq][kq]
AW[db][dc][cd][ce][de][ef][ff][dg][cj][cp][co][do][iq][kp][jq][lp][mp][qo][qf][re][qd][rc][rb][pc][pb][ob][jd][hb][gc]
LB[hg:A][dk:B][np:C][qn:D]
C[Should Black play at A, B, C, or D?

Source
    Go World #14, p. 59
    "How Would You Play Here?", Miyamoto Naoki 9P]
(;
B[dk]
C[Correct.  The right move at the right time.];
W[ck]
C[Necessary.  White cannot allow Black to take this point.];
B[dl]
LB[nc:A][jp:B]
C[Black's forcing moves have connections with two other parts of the board.  Black's moves are a ladder breaker for:
    1.  White's cut at A.
    2.  Black's cut at B.];
W[cl]
C[Again forced, but ...];
B[jp]
C[... now Black has this severe cut.

Saving both halves of the split group is unreasonable for White, so ...];
W[io]
C[... perhaps the best that White can do is to run out.];
B[jo];W[jn];B[ko];W[ip];B[kn]
C[But after Black turns here, Black can expect a fairly large territory in the lower right center.

And because Black's lower left is solid, White's new lower center thickness has no great effect.]
)
    (;
    W[fn]
    C[Note that if White could play first, White would extend here, which defends the bottom stones and expands the left side territory.];
    B[dk]
    C[Now if Black tries to force here, ...];
    W[fk]
    LB[jp:A]
    C[... White has enough strength to counterattack here.  And Black has little chance of cutting at A.]
    )
    (;
    B[hg]
    C[A fairly good move, but not at good as the correct main line.];
    W[fn]
    LB[jp:A][nc:B]
    C[White will jump here to strengthen the left side and prevent the cut at A.

Also White still threatens the cut at B.]
    )
    (;
    B[qn]
    LB[np:C]
    C[A good move locally (as is C).  But the given move is only profit-oriented, so ...];
    W[fn]
    C[... again, White plays here and Black will have to work hard to win.];
    W[nq]
    C[As an aside, note that White's move here is not a serious threat.  Do you see why?];
    B[nr]
    LB[np:A]
    C[The reason is that Black can safely defend here, instead of cutting at A.]
    )
)

