(;
AB[qd][qe][qf][rg][rh][ri]
AW[qc][pc][oc][pe][rf][pf][qg][qh][qi][qj][ql]
PL[W]
C[White plays.

An ancient classic theme.]
(;
W[rd]
C[Fails.];
B[re];W[se];B[sf];W[sc]
C[Black has a ko, and local ko threats.]
)
    (;
    W[se]
    C[The start of the ancient tesuji sequence.];
    B[re]
    (;
    W[sc]
    C[Looks like the tesuji follow-up, but fails here.];
    B[rc];W[rb];B[sf];W[rd]
    C[Again, White has to settle for just a ko.]
    )
        (;
        W[sd]
        C[A beautiful move!];
        B[rc];W[rb]
        (;
        B[sb]
        (;
        W[sf]
        C[Another hard to spot tesuji!];
        B[qb];W[ra];B[qa];W[rd]
        C[Finally Black collapses.]
        )
            (;
            W[sc]
            C[A big mistake.];
            B[sf];W[sa];B[rd]
            C[Black lives easily.]
            )
        )
            (;
            B[sf]
            (;
            W[sb]
            LB[rf:A]
            C[White connects out without a liberty shortage, so A is a false eye.  Black dies.]
            )
                (;
                W[sc]
                C[A big mistake.];
                B[sb];W[sa];B[rd];W[sb];B[qb]
                )
            )
        )
    )
)

