(;
AB[lq][lr][ls][mq][nq][nr][or][pr][qr]
AW[lo][lp][no][op][oq][qp][qq][iq][kq][kr][mr][ms][rr][ns][ps][qs]
C[Black plays.]
(;
B[os]
C[This (failing) obvious move shows Black's problem.];
W[ms];B[rs];W[qs];B[rq];W[ss];B[ps];W[rp];B[rs];W[sq]
C[Note that Black doesn't even have a ko, because the 1-1 and 1-3 points are both false eyes.]
)
    (;
    B[rs]
    C[So Black has to catch White in a liberty shortage, but this throw-in doesn't work either.];
    W[ss];B[rq];W[rp];B[os];W[ms];B[rs];W[qs]
    C[Black dies with the same problem.]
    )
    (;
    B[rq]
    C[The reader can verify that this placement does work either after ...];
    W[ss]
    C[... White creates the same false eyes shape as before.]
    )
    (;
    B[sr]
    C[This clamp is the only move.];
    W[rq]
    C[Connecting is the best that White can do, but ...]
    (;
    B[rs]
    C[... Black has this ko, which is the best for both sides.]
    )
        (;
        B[os]
        C[Note that Black still cannot capture the 3 stones.];
        W[ms];B[rs];W[qs]
        C[Black has 2 false eyes again.]
        )
    )
)

