(;
AB[eb][ec][dd][jd][pd][df][pf][bg][bh][cg][dj][fj][jj][pj][ck][cl][dp][ep][fp][jp][pp][cq][cr][nq][br]
AW[fc][fd][nc][jf][mf][ch][ci][dh][fh][bi][dl][dm][qn][co][cp][do][bq]
TR[fh]
C[Black's response to White's marked jump?

Source:
    "9-Stone Teaching Game"
    James Kerwin 1P
    American Go Journal, 2003 yearbook, pp. 13-14]
(;
B[ff]
C[In the game, Black incorrectly jumped out from this direction.];
W[gf]
C[For reference and a later follow-up move, the game line follows.];
B[fg];W[gg];B[gh];W[eg];B[fi];W[ef];B[eh];W[dg];B[de];W[fe]
C[The fighting does not go well for Black.  White no longer has any problems with the upper left side group.]
(;
B[ql]
C[Again, Black chooses the wrong direction of play.]
)
    (;
    B[gm]
    C[Instead, Black should block White's exit to the center here.  White must now defend his lower left side group in gote.  And Black's center stones are now completely secure.]
    )
)
    (;
    B[hj]
    C[Instead, Black should link up here.  This move might look slow, but ...]
    (;
    W[ff]
    C[... if White defends the stones above, ...];
    B[fm]
    C[... Black has this attractive attack against the lower left group.]
    )
        (;
        W[gn]
        C[... if White defends the stones above, ...];
        B[ie]
        C[... Black has this attractive attacking sequence.];
        W[ff];B[if]
        C[Compare this result with the game line.]
        )
    )
)

