(;
AB[br][bq][cq][jq][kq][qq][dp][pp][co][do][jo][ko][jn][qn][cm][em][jm]
AW[bs][cr][er][pr][dq][fq][lq][nq][cp][lp][lo][kn][ck]
C[Black plays.

Source:
    Tesuji Dictionary, by Segoe Kensaku & Go Seigen];
B[gr]
C[Most go players should never even consider any other move.  With rock solid groups on either side, Black only needs to take the vital points to destroy White's eye-shape.]
(;
W[fo]
C[White tries to run out to find eye-space, but ...];
B[ep]
C[... Black only needs to take the vital point to ruin eye-shape.];
W[gq];B[hr];W[hn]
C[White threatens to run out into the center, but ...];
B[ho]
C[... Black threatens to push in from the left and cut the group in half.];
W[go]
C[White maintains the connection, but ...];
B[gm]
C[... Black takes another vital point that threatens to cut or seal White inside.  White's prospects are dismal.

A classic example of attacking a weak group by denying the opponent of vital points.]
)
    (;
    W[ep];B[fo]
    C[Another vital point.  White can make an eye in gote in the lower left, but White has nowhere to make a 2nd eye.]
    )
)

