(;
AB[bn][cn][co][bp][bq][cr][dr]
AW[bo][do][cp][cq][dq][eq][br][er]
C[Black plays.

Source:
    From the endgame volume of Gokyo Seimyo, a nearly 200 year old problem set.]
(;
B[ar]
C[The wrong direction.];
W[bs]
C[White captures the 2 stones in gote, but Black has another sequence that is several points better with respect to this net corner territory result.]
)
    (;
    B[bs]
    C[Correct, but some of Black's corner stones still seem to be in trouble.];
    W[ar];B[cs]
    C[The key follow-up tesuji.];
    W[es];B[ao];W[ds];B[aq];W[as];B[cr]
    C[This under-the-stone play gives Black the corner.]
    )
)

