(;
AB[om][on][qm][rm][sn][qo][qp][ro][rp][op][pp][rq][or]
AW[ol][pl][ql][rl][nm][nn][no][np][nq][nr][so][sp][sq][sr][ss][qq][pr][rr]
C[Black plays.]
(;
B[oq]
C[Connecting here might be the 1st thought to cut off the lower right stones.];
W[os];B[qs]
C[Black keeps White from making an eye, but ...];
W[ps];B[qr];W[rs];B[qr];W[qs]
C[... White can still connect out.]
)
    (;
    B[ps]
    C[This hane is better than the previous variation, by preventing White from directly connecting out.];
    W[oq];B[qr]
    C[And this throw-in creates a liberty shortage for White, but ...];
    W[qs];B[pq];W[os];B[qr]
    C[... Black only has a ko to capture the corner stones.]
    )
    (;
    B[qs]
    C[Correct.]
    (;
    W[ps];B[pq]
    C[Black captures the corner.];
    W[qr];B[os]
    )
        (;
        W[qr]
        C[Connecting here creates a new problem for White.];
        B[oq];W[os];B[ps];W[rs];B[ps];W[ns];B[pq]
        )
    )
)

