(;
AB[pd][ei][fi][fh][fg][de][cd][cc][be][cf][ca][bb][bc][ad][dd][fk][ek][dl][cl][bm][bn][bo][cp][cq][cr][dr][gj][hi][ii][ji][ij][mo][pq][qp][po][no][lo][ln][qr][rq][or][nq][mq][mr][lp][ql][kl][jl][jk][kh][lh][mh][nh][ng][ni][hf][ie][id][ic][ib][jb][pc][nc][ka][lb][kb][kc][kd][ke]
AW[dp][ci][eh][eg][dg][cg][bh][bf][ag][ff][fe][dc][cb][eb][db][fc][ee][df][ae][he][if][jf][je][jd][jc][kf][ig][ih][hh][le][ld][lc][mf][hj][gk][ik][il][hl][fl][el][dm][cm][jm][jj][kj][li][mi][nj][oj][oi][qj][qc][rd][qe][qg][mp][np][oq][pr][lq][kq][jp][jn][lm][mm][mn][cn][co][dq][er][fq]
C[Why does Black resign after the marked play?

Source:
American Go Journal, Vol. 31, No. 4, pp. 15-16
Commentary:  Michael Redmond 8P
Black:  Gin-hua Peng 5P
White:  Michael Redmond 8P
1997-02-23, IGS game]
TR[dm];
B[pe]
LB[gg:A][dk:B]
C[Black's move here seems to make miai of pushing through into the top right and capturing White's center top group with A.

Note:  A quick count shows that White already has enough territory to win.  So Black doesn't have time for normal moves, e.g., protecting the cut at B.];
W[of]
C[But White's nice move here both protects the center group, and counterattacks Black's center group!]
(;
B[qd];W[pf];B[re];W[qf];B[rc]
C[The top right changes hands, but ...];
W[dk]
C[... White's cut here captures the center group.]
)
    (;
    B[pf]
    C[Continuing to push through is no better.];
    W[og];B[pg];W[oh];B[qf]
    C[Creating bigger damage to the top right is still not enough, because ...];
    W[dk]
    C[... cutting and capturing the center group is bigger.]
    )
)

