(;
AB[qn][ro][so][op][pp][qp][nq][nr][qq][lr]
AW[rp][rq][oq][or][os][pq][qr]
C[Black plays.]
(;
B[rs]
C[This 2-1 point is often the vital point of the shape, but not here.];
W[rr]
C[White does need to be careful, but connecting here eliminates all the aji.  White is alive.]
)
    (;
    B[rr]
    C[Correct.];
    W[sr];B[rs];W[sq]
    (;
    B[sp]
    C[Careless.];
    W[qs];B[ss];W[rq]
    C[With this "under the stones" capture, White makes a 2nd eye in the corner.]
    )
        (;
        B[ps]
        C[Correct.];
        W[pr];B[ns]
        C[With a liberty shortage, White dies.]
        )
        (;
        B[pr]
        C[Also works.];
        W[ps];B[ns]
        C[And White cannot approach from either side, so White dies.]
        )
    )
)

