(;
AB[rc][qc][pc][oc][nb][pd][qe][re][sd][jd][dc][de][ce][ec][cj][eq][dq][cp][cn][dl][fm][rq][qo][qn][rm][rl][rk][ql][en][dm][ck][di][ei][fh][gh][gf][ff]
AW[rf][qf][pe][od][nc][mc][oe][qk][rj][pj][pl][pm][qm][pn][op][pq][jp][jm][fq][fp][ep][ej][eg][cg][db][ie][hg][hh][fi][gi][eh][dk][el][em][fn]
C[Black plays.

Clearly Black has a lot of territory, but Black must still reduce White's moyo somewhat to win.  How?

Source:
    American Go Journal, Summer 1990, Vol. 24, No. 3, p. 25
    "Jim's Journal", James Kerwin 1p
    The game is from 2-dan players at a US Go Congress.]
(;
B[fl]
C[Correct.];
W[ek]
C[If White tries to prevent Black from breaking through the left side wall, ...];
B[fj]
C[... Black only needs to make simple forcing moves.];
W[fk];B[gj];W[gk];B[hi];W[hk];B[ji]
C[White collapses after Black breaches White's left wall.]
)
    (;
    B[fj]
    C[Slack.  This play is from the game line.];
    W[fl]
    C[White strengthens the moyo's left wall.  White still has weaknesses, but Black missed an easy path to a win.]
    )
)

