(;
AB[cj][dl][em][en][cn][dn][eq][cr]
AW[bi][ci][di][fj][bl][el][fl][cm][dm][cp]
C[Black plays.

Source:
    Go World #20, p. 58
    Sakai Masanori 4p and James Davies]
(;
B[bm]
C[The standard tesuji is to atari here to protect the corner.  Play out the following sequence to see what usually happens.

If you would have played this move, you're in good company - James Davies also played this move.

The only problem is that Black has an even better move, as the variation shows!];
W[cl]
C[After White protects, Black can tenuki, because ...]
PL[W];
W[bn]
C[... when White captures the stone, ...];
B[bo];W[an];B[bp]
C[... Black can protect the corner.

Now go back to see the variation to Black's 1st move.]
)
    (;
    B[bn]
    C[Descending here is the best play.]
    PL[W]
    (;
    B[cl]
    C[White cannot tenuki, because this atari is very big.];
    W[bm];B[bk]
    C[Black not only protects the corner, but also changes White's left side territory into Black's.]
    )
        (;
        W[cl]
        C[White can defend with this move from the main line, but Black is clearly better than the main line.]
        )
        (;
        W[bm]
        C[White can do a bit better by defending here, but Black is still clearly better than the main line.]
        )
    )
)

