(;
AB[po][op][oq]
AW[pp][qp][oo][lp]
C[Black plays.

The correct tesuji in this common corner situation also appears in numerous other contexts, which is probably why pros voted this tesuji one of the top 10 tesujis to know.

Source:
    "Top Tesuji" poll from pros in the "Go Weekly" newspaper.]
(;
B[no]
C[Vulgar.];
W[on]
C[Black forces White into a stronger shape on the right.];
B[mp];W[lo]
C[After standing up here, White's left stones are also stronger.];
B[nn]
C[Black escapes, but White's overall shape is too strong.]
)
    (;
    B[mp]
    C[Correct start.];
    W[lo]
    C[White becomes stronger on the left, but ...];
    B[on]
    C[... now Black sets up the classic "driving tesuji".];
    W[no];B[mo]
    C[Black drives White's stones into a wall.];
    W[nn];B[mn]
    C[More of the driving tesuji.  Black's escapes to the center in sente.];
    W[nm]
    C[White ];
    B[lq]
    C[Now Black's hane makes good shape below and weakens the 2 stones to the left.];
    W[pn]
    C[White repairs the bad aji on the right, but ...];
    B[kq]
    C[... Black can further strengthen the bottom, e.g., by extending here.

This overall result is clearly superior to that in the other variation.]
    )
)

