(;
AB[oo][kp][pp][qp][rp][sp][mq][nq][oq][kr][lr][pr][ps][qr]
AW[pq][qq][rq][mr][nr][or][rr][rs]
C[Black plays.]
(;
B[sq]
C[The 1st move that might come to mind is to squeeze from this side.]
(;
W[sr]
C[If White blocks, ...];
B[ms]
C[... White dies from an embarrassing lack of liberties.]
)
    (;
    W[os]
    C[But White can simply capture the 3 stones.];
    B[ms];W[qs];B[sr];W[pr]
    C[White lives.]
    )
)
    (;
    B[ms]
    C[Correct.];
    W[qs];B[os]
    C[Black creates the classic zig-zag shape.];
    W[ns];B[pr];W[ls];B[ps]
    C[But instead of an "under the stones" capture, Black has this eye-destroying descent.]
    (;
    W[sq];B[sr]
    C[Now White cannot approach the 2 stones from either side.  White dies from a false seki.]
    )
        (;
        W[qr];B[sq];W[os];B[sr]
        )
    )
    (;
    B[os]
    C[Transposes to the previous variation.];
    W[qs];B[ms]
    )
)

