(;
AB[po][qo][ro][np][nq][nr][ns][op][rp][os][rs]
AW[pp][qp][oq][or][rq][pr][ps][qr]
C[Black plays.]
(;
B[sr]
C[Bad timing.];
W[sq];B[qq];W[rr]
C[White can dodge to here.];
B[pq]
C[White is happy to give up 2 stones for this ko.]
)
    (;
    B[qq]
    C[Correct timing for the throw-in.];
    W[pq]
    C[Now White can do no better than capturing.]
    (;
    B[sr];W[sq]
    C[To have any chance, White must block here.];
    B[rr]
    C[But after Black connects, White cannot atari the 3 inside stones.  With a false eye, White dies.]
    )
        (;
        B[rr]
        C[Note that Black cannot take the 2-2 point immediately.];
        W[sr]
        C[White takes the vital point.  White lives with a seki.]
        )
        (;
        B[sq]
        C[This hane also fails.];
        W[sr];B[rr];W[sp];B[so];W[sq]
        C[Again White lives with a seki.]
        )
    )
)

