(;
AB[qe][pd][nd][jc][qk][ok][pq][ng][om][rn][qo][po][op][oq]
AW[dd][dp][jq][qf][pf][qi][qm][ro][rp][qp][pp][qq][qr][oo]
TR[oo]
C[Black's response to White's marked cut?

Source:
    American Go Journal, Summer 1989, Vol. 23, No. 3, pp. 23-24
    Finish the Opening, James Kerwin 1p];
B[no]
TR[qm]
C[In the sequences that follow, White cannot break through Black's overwhelming outside wall.

This position is typical of what happens when White prematurely invades with the marked stone, as described in last week's problem.]
(;
W[on]
C[White can try to escape, but ...];
B[nn];W[pn];B[qn];W[pm];B[rm];W[ol];B[pl];W[nm];B[ql];W[om];B[mm];W[nl];B[mk]
TR[qm]
C[... Black has a net to catch White.]
)
    (;
    W[qn]
    C[The best that White can do.];
    B[pn];W[rm]
    C[White captures a stone, but is sure to lose this game.]
    )
)

