(;
AB[no][np][qo][pp][pq][nr]
AW[kq][nq][oq][or]
C[Black plays.]
(;
B[pr]
C[Black can block the corner in sente, but ...];
W[mr]
C[... White captures the stone with a strong group facing to the left along the lower side.  Black can do better.]
)
    (;
    B[mq]
    C[Correct.];
    W[mr];B[lr]
    C[Black's double hane cuts off the marked outside stone.]
    TR[kq];
    W[ns];B[lq];W[pr]
    C[White can live along the lower side, but ...];
    B[qr]
    C[...Black can limit the damage to the corner.  More importantly, Black's outside strength is worth much more than the loss in the lower right.]
    )
)

