(;
AB[bq][cq][mq][dp][pp][do]
AW[dq][fq][bp][cp][qn]
C[White plays.

Source:
    Tesuji Dictionary, Vol. 1, Hasami-tsuke #29]
(;
W[br]
C[A beautiful attachment that works surprisingly well here.  No matter what Black does, White's stones will all work together.]
(;
B[eq]
C[Black's atari from the outside here immediately gives White the corner.];
W[dr];B[bo];W[cr];B[co]
C[In compensation for the corner, Black forms outside thickness.];
W[aq];B[fp];W[er];B[gp];W[ep];B[eo]
C[In the end, Black forms an even stronger wall facing up the left side, but White has taken nice corner territory in sente.]
)
    (;
    B[dr]
    C[Black can atari from the inside here to keep the corner.];
    W[eq];B[cr];W[cn]
    C[But now both of White's groups now have running room down the left and bottom sides.];
    B[bs]
    C[Black has no choice but to make life in the corner.];
    W[dn];B[fo];W[iq]
    C[Up to here, Black has made a tiny life in the corner, but White's groups have become stronger while pressuring the weak left center group.]
    )
)
    (;
    W[cr]
    C[A mistake.];
    B[br]
    C[Black takes the key point.  White is now going to lose either the 2 left stones or 2 of the bottom stones.]
    )
)

