(;
AB[qk][oo][po][qo][op][nq][nr][or]
AW[np][pp][pq][iq][mq][mr][oq][qq]
C[Black plays.];
B[mp];W[no]
(;
B[lr]
C[Tesuji!  An ingenious way to make Black's next move sente.];
W[lq];B[lp]
C[Sente.];
W[kq]
C[After White protects the lower side, ...];
B[mn]
C[... now Black has time to attack the 2 stones.]
(;
W[nn]
C[If White tries to run, ...];
B[nm];W[on];B[om];W[pn];B[qn];W[pm];B[pl];W[qm];B[rm]
C[... White runs out of liberties.]
)
    (;
    W[pr]
    C[White can connect on the lower side, but ...];
    B[nn]
    C[... Black can still seal off the center.];
    W[os]
    )
)
    (;
    B[lp]
    C[Extending without the contact play is a mistake.];
    W[pr];B[nn]
    C[Black needs a good ladder situation.]
    )
    (;
    B[lq]
    C[Also inferior.];
    W[lr];B[kr]
    C[If Black tries to avoid needing a ladder, ...];
    W[lp]
    C[... the reader can work out the details.]
    )
)

