(;
AB[jc][od][qd][qj]
AW[ql][gc][dd]
C[White plays to reduce the upper side.

Source:
    American Go Journal, 1985, Vol. 19, No. 1, pp. 28-31
    Keshi and Uchikomi, Kaoru Iwamoto 9 dan
    
The given lines are just a small sampling of lines of play to obtain a feel for the possibilities in this formation.]
(;
W[ld]
C[Questionable.];
B[lc];W[mc];B[md]
C[If White tries to separate Black, Black cuts.  White is going to be  at a disadvantage in this fight.]
)
    (;
    W[mc]
    C[Playable];
    B[oc];W[le];B[je]
    LB[ge:A]
    C[This line of play is not disadvantageous for Black, who has the corner for a base and can aim at A.]
    )
    (;
    W[md]
    C[Bad];
    B[je]
    C[White's stone lacks a base, in addition to not having an effect against Black's corner.  This approach is not worthy of consideration for White.]
    )
    (;
    W[lc]
    C[Also playable];
    B[kd]
    C[One of many possible Black approaches.];
    W[me]
    C[Best.  White's play is flexible and generally acceptable.];
    B[nc]
    C[Black ropes off the corner and threatens to cut White.];
    W[ld];B[kf];W[mg]
    C[And White runs out.]
    )
)

