(;
AB[rk][qm][qn][qo][qp][rm][po][op][oq][or][mr][ps]
AW[rn][ro][rp][rq][pp][pq][pr][qr]
C[Black plays.]
(;
B[sr]
C[A vital point for eyes, but ...];
W[sq]
C[... White already has separate spaces for eyes.];
B[sn];W[so]
(;
B[qq]
(;
W[rs];B[rr]
C[Black can try to make a false eye, but ...];
W[ss];B[rr];W[sr];B[os];W[qs]
C[... White has no trouble making eyes.]
)
    (;
    W[rr]
    C[Note that White cannot make a 2nd eye here.];
    B[rs]
    C[With a liberty shortage, White only has a ko.]
    )
)
    (;
    B[rr];W[rs];B[qq];W[ss];B[rr];W[sr];B[os];W[qs]
    )
)
    (;
    B[rr]
    C[No better.];
    W[rs];B[sr];W[sq]
    C[And this sequence transposes to previous variations.]
    )
    (;
    B[rs]
    C[Good move.];
    W[qs];B[rr];W[qq];B[sn];W[so];B[sq];W[os];B[sr];W[sm];B[ss]
    C[Dead shape -- White doesn't even have a ko.]
    )
)

