(;
AB[pn][qn][lo][oo][lq][qq]
AW[np][oq][pq]
PL[W]
C[White's response to the marked play?]
TR[qq];
W[qp]
C[Questionable.  White should probably try to live with A instead.

But now the real problem arises.  What should Black do?]
LB[qr:A];
B[rq]
C[So far so good.  Black threatens to connect out.];
W[rp]
C[White blocks, of course.  Now what should Black do?]
(;
B[pp]
C[Cutting here is a mistake.];
W[rr]
C[Tesuji.];
B[qr];W[sq]
C[White lives.]
)
    (;
    B[rr]
    C[Correct tesuji!];
    W[po]
    C[For example ...];
    B[pr]
    C[Black lives in the corner, and White is in trouble.]
    )
)

