(;
AB[mn][nn][lo][oo][po][qo][qp][mq][pq][pr][ps]
AW[kn][ln][mo][no][kp][kq][np][op][pp][nq][or][os]
C[Black plays.]
(;
B[oq]
C[Pushing in gains little.];
W[nr]
C[... White can calmly defend here.  Black has nothing.]
)
    (;
    B[mp]
    C[Looks more interesting, but ...];
    W[nr]
    C[... again, White has this defense.];
    B[lp];W[mr]
    )
    (;
    B[nr]
    C[The correct move to expose White's liberty shortage.]
    (;
    W[mr]
    C[If White tries to capture everything, ...];
    B[mp];W[ns];B[oq]
    C[... White takes a big loss.]
    )
        (;
        W[lp]
        C[Because of the previous variation, White has nothing better than connecting here to save most of the stones.];
        B[mp]
        C[But Black can still take profit.];
        W[ko];B[oq];W[lo];B[lr]
        )
    )
)

