(;
AB[nb][nc][mc][oc][pd][qd][sd][se][oe][re][qf]
AW[oa][ob][rb][rc][rd][pc][qc][od]
C[Black plays.

Source:
Go World #28, pp. 53-54 Summer 1982
"One Page Lesson:  Endgame Technique"
Miwa Yoshiro 8P]
(;
B[sc]
C[Pushing in sente looks reasonable.];
W[sb];B[na]
C[Also sente, but ...];
W[pb]
C[... White has 5 points in the corner.  Black's moves are unimaginative.]
)
    (;
    B[qa]
    C[This placement is often a vital point for this shape.];
    W[qb];B[sb]
    C[A follow-up tesuji.]
    (;
    W[sc]
    C[If White carelessly blocks, ...];
    B[ra]
    C[... Black can start a ko for the corner.]
    )
        (;
        W[ra]
        C[Instead, White will correctly defend here.];
        B[sc];W[pa]
        C[White lives, but with only 3 points.

But Black has an even better attacking sequence!]
        )
    )
    (;
    B[sb]
    C[Attaching here immediately is even better.]
    (;
    W[sc]
    C[If White greedily blocks, ...];
    B[qa]
    C[... Black's placement is severe.]
    (;
    W[ra]
    C[White cannot block.];
    B[pb]
    C[Black kills the corner.]
    )
        (;
        W[pb]
        C[Connecting is better, but ...];
        B[ra]
        C[... Black has a ko.]
        )
    )
        (;
        W[qa]
        C[So White must tamely answer here.];
        B[sc];W[pb]
        C[White's territory reduces to a miserable 2 points, which is the best result for both sides.

A bit of care can make a big difference in your endgame.]
        )
    )
)

