(;
AB[nm][om][pm][rm][ln][mn][qn][ro][rp][lp][mp][sq][sr][mr][nr][pr][rr][qs]
AW[nn][on][pn][no][qo][qp][qq][qr][op][oq][or][rq]
(;
B[pq]
C[Trying to ruin White's eye shape by pushing in immediately is a mistake.];
W[os]
C[Now Black has a liberty problem.];
B[ps];W[rs];B[ss];W[pp]
C[White easily makes eyes.]
)
    (;
    B[ps]
    C[Correct.  Connecting seems to have the same problem as the previous variation, but actually begins the building of the classic shape.]
    (;
    W[pq];B[po];W[rs]
    C[Looks hopeless for Black, but ...];
    B[os]
    C[... Black has this classic tesuji.];
    W[ns];B[ps]
    C[White cannot make an eye on the bottom edge.];
    W[qs];B[os]
    )
        (;
        W[po];B[pq]
        C[White can force Black to push in here, but now Black has an extra liberty.];
        W[rs];B[ss];W[os];B[rs]
        C[White has nothing.]
        )
    )
)

