(;
AB[is][ks][er][ir][or][dq][hq][iq][oq][jp][lp][np][co][jo][lo]
AW[js][gr][jr][lr][mr][nr][jq][kq][lq][fp][gp][ip][qp][eo][io][jn][im][qm]
C[Black plays.

Source:
    Tesuji Dictionary, V.2, Ch.6, #12]
TR[iq][hq][ir][is]
(;
B[gq]
C[The obvious move, but bad timing!];
W[fq]
(;
B[fr]
C[Black seems to be connected, but ...];
W[hs]
C[... when White makes the diagonal tesuji, Black has an unpleasant liberty shortage surprise.]
)
    (;
    B[fs]
    C[Black can try to connect underneath, but ...];
    W[hs]
    C[... White has the same diagonal tesuji.];
    B[gs];W[hp]
    C[In this variation, Black cannot avoid the snapback.];
    B[hr];W[hs]
    )
)
    (;
    B[fs]
    C[Correct timing.]
    (;
    W[gs]
    C[White's toughest defense.];
    B[gq];W[fq];B[fr]
    C[A very interesting position!

White can create a local seki with the 2 stones, but White's group on the right has only one eye.  Black can eliminate all the liberties of that one-eyed group,  after which Black can capture all of White's bottom stones.]
    )
        (;
        W[gq]
        C[If White blocks the high escape, ...];
        B[gs]
        C[... Black connects underneath.];
        W[hs]
        C[Note that White cannot catch Black in a liberty shortage.];
        B[hr];W[hp];B[hs]
        )
        (;
        W[hs]
        C[With Black having an extra liberty, White's diagonal tesuji no longer works.];
        B[gs]
        )
    )
)

