(;
AB[el][hl][dm][fm][gn][in][co][go][io][cp][fq][gq][iq][cr]
AW[im][fn][jn][do][fo][jo][ep][ip][jp][eq][jq][er][jr]
C[White plays.

Source:  Gokyo Shumyo, a 200 year old collection of classic tsumego and tesuji problems.]
(;
W[hs]
C[Correct.  Black cannot avoid a liberty shortage while trying to stop White's connection.]
(;
B[hr]
C[The toughest defense.]
(;
W[ir]
C[A slow-looking but fantastic move!];
B[gr];W[gp]
LB[gs:A]
C[Or A.  White sets up a liberty shortage on Black.];
B[hp];W[gs];B[fs];W[is];B[fr];W[fp];B[hq];W[es];B[ho];W[gm]
C[White captures!]
)
    (;
    W[gs]
    C[Looks good, but ...];
    B[is]
    C[... Black can easily keep the White stones disconnected.]
    (;
    W[ir];B[fs];W[js];B[fr];W[gp];B[hp]
    C[White doesn't even have a ko.]
    )
        (;
        W[fr];B[ir]
        )
    )
)
    (;
    B[gr];W[gs]
    C[Now White has a simple sequence of forcing moves to connect.];
    B[fs];W[fr];B[is];W[hr];B[ir];W[hp]
    LB[gp:A][hq:B]
    C[A and B are miai for White.]
    )
    (;
    B[gs];W[gr]
    C[Again, White has a straightforward connection sequence.];
    B[fr];W[fs];B[hr];W[gs];B[is];W[es];B[ir];W[hp]
    LB[gp:A][hq:B]
    C[A and B are miai for White.]
    )
)
    (;
    W[fs]
    C[A common connection tesuji, but fails here.];
    B[hr];W[hs];B[is];W[gs];B[ir];W[gp];B[hp]
    C[White cannot catch Black in a liberty shortage.]
    )
)

