(;AB[ce][cj][eq][cd][ed][ee][fe][gd][gg][if][qj][jq][hq][gq][dq][dr][cr][cn][cm][dm][fl][dj][ci][ch][eg][hi][qd][oc]AW[dc][kd][hc][he][fd][ec][fc][cc][bc][af][bg][cg][df][dh][dg][di][fi][qo][pq][mq][br][cq][cp][dp][ep][en][dn][gp]C[Black plays.

Source:
    Blueprint 361, Miyamoto Naoki 9p
    Go World #8, Jul-Aug 1978, p. 52]SZ[19]
;C[Hint:  A, B, or C?]LB[bs:a][qn:b][md:c]
(;B[bs]C[Trying to take away White's base is usually a good idea, but the idea fails in this position.];W[io]C[White ignores the corner move to jump out toward the center.];B[ho];W[hn];B[hp];W[gn]TR[bs]C[Black's attack runs out of momentum as White escapes to the center.  Black's marked first move has turned out to be a waste.])
(;B[qn]LB[qm:a][qh:b]C[This attachment is correct, but somewhat complicated.

Note that Black A is too soft, because White will simply invade at B.]
(;W[pn];B[qm];W[ro]C[If White plays to protect corner territory, ...];B[pg]C[... Black grabs the last big point on the board.])
(;W[po]C[White can also try to stand up here.];B[qq]C[But Black has this corner tesuji.]
(;W[rn]C[If White counterattacks, ...];B[pr];W[oq];B[rr]C[... Black lives easily in the corner.  White's gain on the right side doesn't make up for the loss in the corner.])
(;W[pr]C[If White responds to the corner invasion here, ...];B[ro];W[rp];B[rn];W[pn];B[pm];W[om];B[pl]LB[rq:a]C[... Black finishes a natural sequence up to here.  But Black has a large follow up move at A, so Black has a promising game.])))
(;B[md]C[A Black extension here is not an efficient way to make a moyo in the upper right.];W[ql]C[A White extension here is too large for Black to allow.];B[oj]C[If Black tries to continue with the moyo here, ...];W[oh];B[qh]C[... White can significantly reduce the moyo.]))