(;
AB[ec][lc][gd][md][nd][qd][pe][nj][qj][cn][bo][bp][bq][cp][gp][qp][rp][dq][dr][ds][eq][fq][hq][nq][oq][pq][fr]
AW[qb][cc][nc][oc][rc][de][ch][co][go][qo][ro][dp][ep][fp][mp][np][op][cq][cr][gq][gr][iq][mq][br][hr][es]
PL[W]
C[White's response to Black's moyo-building marked play?  Should White invade or reduce?

Source:
    American Go Journal, v. 34, no 2., p. 14
    (originally from "Go Review VIII", #10)
    "Invading a Moyo", Magari Reiki 8p.]
TR[nj]
(;
W[id]
C[White can try to invade, for example here, but ...];
B[hf]
C[... Black can put severe pressure on the invading stone.];
W[if];B[ig];W[jf];B[jg]
C[Even if White manages to live or escape, Black will be able to build up outside thickness that can more than compensate for White's invasion.]
)
    (;
    W[he]
    C[Reducing with this shoulder hit is more flexible.]
    (;
    B[ge]
    C[Black can try to split White by pushing up, but ...];
    W[hf];B[gf];W[hg]
    C[... White can run ahead into the center.];
    B[hd];W[je]
    LB[id:A]
    C[Now White can extend into Black sphere of influence, while threatening to create eye-shape and split Black with A.];
    B[id]
    C[Black must defend.];
    W[lj]
    C[Next, White's cap again reduces Black's moyo, while building a center framework himself.

The game sequence follows.]
    (;
    B[lk];W[kj];B[mk];W[mh];B[kk];W[jk];B[jl];W[ik];B[nh];W[ng];B[oh];W[le]
    C[The game is still far from over.]
    )
        (;
        B[li]
        C[If Black attaches on the other side, ...];
        W[ki];B[lh];W[mj];B[ni];W[ml]
        C[... White flexibly changes direction to create a large lower center framework.

Note also that White still has the jump at A to put a serious dent into Black's right side territory.]
        LB[re:A]
        )
    )
        (;
        B[hd]
        C[Blocking here is another option.];
        W[ie];B[ge];W[hg];B[gf];W[jg];B[gg];W[hh]
        C[This result is similar to the previous variation.]
        )
        (;
        B[dg]
        C[Yet another option for Black is this leaning attack.];
        W[cg];B[df];W[cf];B[ee];W[hh]
        C[But White can flexibly and lightly jump out into the center.]
        )
    )
)

