(;AB[ah]AB[bh]AB[ch]AB[ci]AB[cj]AB[dj]AB[dk]AB[dl]AB[cl]AB[bl]AB[al]AW[ag]AW[bg]AW[cg]AW[dh]AW[di]AW[eg]AW[ej]AW[ek]AW[el]AW[dm]AW[cm]AW[bm]AW[am]AW[bk]AW[bj]LB[gi:A]LB[gk:D]C[Black has no ko threat.
What is the status of the black group ?
Unconditionally alive (A), unconditionally dead (D) or Black must play to save it (please play) ?]AP[goproblems]
(;B[ak]
(;W[aj]LB[gj:T]C[Tenuki (play T) ?]
(;B[bi]C[Seki, well done !RIGHT])
(;B[gj];W[bi]C[Oh no, Black is dead now !])
(;B[ck]C[Black is dead now !])
(;B[ai]C[Black is dead !]))
(;W[bi]LB[gj:T]C[Tenuki (play T) ?]
(;B[aj]C[Seki, well done !RIGHT])
(;B[gj];W[aj])
(;B[ai]C[Black is dead now !])
(;B[ck]C[Black is dead now !]))
(;W[ai]LB[gj:T]C[Tenuki (play T) ?]
(;B[bi]C[Alive with points, well done !RIGHT])
(;B[aj]C[Alive with point, well done !RIGHT])
(;B[ck]TR[ai]C[Seki, but after White A11, Black can do much better !])
(;B[gj];W[bi]C[Oh no, Black is dead now !]))
(;W[ck]LB[gj:T]C[Tenuki (play T) ?]
(;B[bi]C[Alive with points, well done !RIGHT])
(;B[aj]C[Alive with points, well done !RIGHT])
(;B[ai]TR[ck]C[Seki, but after White C9, Black can do much better !])
(;B[gj];W[aj]TR[ck]C[Seki, but after White C9, Black can do much better !])))
(;B[bi];W[ak]
(;B[aj];W[ai]C[Oh no, a (huge) ko...])
(;B[ai]C[Black is dead !])
(;B[ck];W[ai]C[Ooops !!]))
(;B[ai];W[aj]C[Black is dead !];B[ak])
(;B[ck];W[aj]C[Black is dead !])
(;B[aj];W[ak]
(;B[bi])
(;B[ai]C[Black is dead !])
(;B[ck];W[ai]C[Black is dead !]))
(;B[gi];W[bi]C[Are you sure ? Save it now (you can tenuki at T) !]LB[gk:T]
(;B[gk];W[ai]C[Tenuki (play T) ?]LB[gm:T]
(;B[ak];W[aj];B[ck];W[bj]C[Black is dead !])
(;B[ck];W[ak]C[Ooops !!])
(;B[aj];W[ak]C[Black is dead !])
(;B[gm];W[ak]C[Black is dead !]))
(;B[ai];W[aj]C[Black is dead !])
(;B[ak];W[aj]C[Black is dead !])
(;B[ck]C[Black is dead !])
(;B[aj];W[ai]C[Tenuki (play T) ?]LB[gk:T]
(;B[ak];W[ck]C[Ooops !!])
(;B[gk])))
(;B[gk]C[Nope, you can save it !!]))