(;
AB[pd][pq][qo][cd][bd][ce][bf][bg][cg][ch][fi][fj][fk][ek][dl][cl][cm][cn][dn][do][em][ao][bp][cp][br][bq][bs][cq][ep][eq][er][es][fq][gp][hp][ip][jo][ko][jm][jl]
AW[cc][ec][be][cf][de][df][dg][ej][dj][dk][ck][bl][bm][bn][bo][co][dp][dq][dr][cr][ap][aq][eo][en][go][io][in][im][hk][jd][nc][nq][lp][jq][jp][gq][hq][hr][gs][fr]
C[Black's SIMPLEST decisive response to the marked play?

Source:
    American Go Journal, Fall 1990, Vol. 24, No. 4, pp. 18-19
    "Jim's Journal", James Kerwin 1p
    The game is from the 6th US Go Congress.]
TR[hk]
(;
B[ij]
C[A natural way to surround White's center group.];
W[hj];B[hi];W[ik];B[jk];W[ii];B[jj];W[gi];B[hh];W[gh];B[gj]
C[Black can cut off the center group.  Black need not be worried about White capturing Black 3 and 9, or a semeai with Black's left center group.  However, this entire fight may be scary.  One possible follow up sequence appears below.

Does Black have an easier way?];
W[gg];B[ih];W[fm];B[ei];W[di];B[dh];W[eh];B[fh];W[eg];B[ci];W[bj];B[cj];W[bk];B[fg]
)
    (;
    B[ei]
    C[Simpler.  Black can turn here in sente to strengthen Black's left center group, as well as cut off White's left side group.];
    W[bi]
    C[White must drop everything to make eyes on the left.];
    B[ci];W[cj];B[ij]
    C[With a stronger left wall, Black can launch a similar, but even stronger, attack against the center group.  One possible follow up sequence appears below.

But does Black have an even simpler attacking sequence?!];
    W[ik];B[jk];W[hj];B[hi];W[ii];B[jj];W[gi];B[hh];W[gh];B[gj];W[gg];B[hg];W[di];B[dh];W[eh];B[eg];W[fh];B[gf]
    C[Again Black can kill White.  But does Black have an even easier win?!]
    )
    (;
    B[gh]
    C[Simplest!  A beautiful double threat move that makes the win easy!]
    (;
    W[ij]
    C[If White escapes with the center group, ...];
    B[ci];W[bj];B[bi]
    C[... White's left side group does not have 2 eyes.]
    )
        (;
        W[bi]
        C[If White lives on the left side, ...];
        B[ij]
        C[... then Black kills the center group without having to worry about White creating a semeai.]
        )
    )
)

