(;
AB[nb][ob][pb][pc][rc][rd][re][rf][qd]
AW[mb][mc][qb][qc][rb][nc][oc][pd][qe][qf][qg][rg]
C[Black plays.]
(;
B[sb]
C[You might think that this liberty-reducing hane trivially captures the 3 stones, but ...];
W[sc]
C[... this throw-in tesuji ruins everything.]
(;
B[ra]
C[A ko is not what Black wants.]
)
    (;
    B[sd]
    C[Trying to avoid the ko isn't good either.];
    W[ra];B[pa];W[na];B[sc];W[sf]
    C[Black collapses.]
    )
)
    (;
    B[ra]
    C[This 2-1 point tesuji sometimes works, but ...];
    W[qa]
    (;
    B[sc];W[na]
    C[... Black still has a liberty problem.];
    B[sb]
    C[Ko.]
    )
        (;
        B[sb]
        C[Ko.]
        )
    )
    (;
    B[pa]
    C[The only move is to fall behind on the liberty count!]
    (;
    W[na];B[ra]
    C[Now White has to make an approach move, so Black captures the 3 stones.];
    W[sb];B[qa]
    )
        (;
        W[ra]
        C[A tricky defense.];
        B[sc]
        C[But Black can descend here - 3 goofy-looking descents in a row!];
        W[sf];B[sb]
        C[Now Black can atari from either side, depending on what White does.]
        )
        (;
        W[sb];B[qa];W[sf];B[ra]
        C[Again, Black lives.]
        )
    )
)

