(;
AB[hn][in][jn][kn][lo][mp][mq][mr][go][fp][eq][er][lr][js]
AW[gq][hq][iq][jq][kq][lq][io][jo][hp]
C[White plays]
(;
W[is]
C[The tesuji to create an eye on the edge.]
(;
B[hs];W[gs]
C[White makes two consecutive 1st line moves.];
B[ir];W[ks]
C[Not many tesuji sequences require three consecutive 1st line moves!];
B[kr];W[jr]
C[White catches the stones in a liberty shortage.]
(;
B[ls];W[hr]
)
    (;
    B[gr];W[hr]
    )
)
    (;
    B[ks]
    C[Another common tesuji that can often destroy an eye on the edge, but doesn't work here.];
    W[hs]
    (;
    B[gs];W[fs]
    (;
    B[fr];W[gr]
    )
        (;
        B[ir];W[hr];B[jr];W[fr]
        )
    )
        (;
        B[jr];W[fr];B[ir];W[hr];B[fs];W[gs]
        )
    )
)
    (;
    W[hs]
    C[A nice try, but fails.];
    B[gr]
    (;
    W[fr];B[fs];W[fq];B[gs];W[hr];B[es];W[jr];B[is];W[ks];B[kr]
    C[White cannot make an eye on the bottom.]
    )
        (;
        W[is];B[fr];W[ks];B[hr]
        )
    )
    (;
    W[gs]
    C[Fails];
    B[is];W[hs];B[fr]
    )
)

