(;
AB[dd][pd][cf][qf]
AW[gc][nc][jd]
C[What does Black do about White's top framework?

Source:
    "Fundamental Matters"
    Kazunari Furuyama
    2004 American Go Yearbook, pp. 47-48]
(;
B[pb]
C[Descending is recommended rather than an immediate invasion of White's moyo.];
W[ne]
C[If White tries to expand the framework, ...];
B[lc]
C[... then Black has this invasion point.];
W[le]
C[If White blocks the jump out into the center, ...];
B[nb]
TR[pb]
C[... Black's earlier marked stone allows for an easier connection to the inside stone.]
(;
W[oc];B[ob]
)
    (;
    W[mb];B[mc];W[ob];B[nd]
    TR[nb]
    C[Black sacrifices the marked stone to connect the inside stones.]
    )
)
    (;
    B[oc]
    C[Attaching is a common mistake.];
    W[nd]
    C[Standing up here makes White's position ideal.  And Black's corner is still open.]
    )
    (;
    B[pc]
    C[Descending here makes defending the corner easier, but ...]
    (;
    W[ne];B[lc];W[le];B[nb];W[ob]
    TR[pc]
    C[... now Black's connection is not so easy, because of the position of the marked stone.]
    )
        (;
        W[ob]
        LB[qb:A]
        C[Also, White's kosumi here, aiming at the invasion at A, is more likely to be sente.]
        )
    )
)

