(;AB[br]AB[cr]AB[cq]AB[dp]AB[ep]AB[co]AB[cn]AW[cp]AW[bp]AW[bq]AW[bo]AW[dr]AW[dq]AW[eq]AW[fq]AW[hq]AB[en]AB[dm]TR[bo]TR[bp]TR[bq]TR[cp]C[Black to capture the marked stones !!!]AP[goproblems]
(;B[ar];W[cs]
(;B[bn];W[bs]
(;B[ao];W[ds]
(;B[ap];W[as];B[aq]C[Good Job !!! (This kind of Tesuji is called 'Sagari Tesuji' because of the extension to A2 so black can win the Semeai) RIGHT])
(;B[aq];W[as];B[ap]C[RIGHT]))
(;B[ap]C[];W[ao]
(;B[an];W[aq];B[ap]C[RIGHT])
(;B[ds];W[aq];B[as];W[cs]))
(;B[aq];W[ds]
(;B[ao];W[as];B[ap]C[RIGHT])
(;B[ap];W[as];B[ao]C[RIGHT]))
(;B[ds];W[aq];B[as];W[cs]))
(;B[aq];W[bn]
(;B[bm];W[bs]
(;B[an];W[ds]
(;B[ao]C[RIGHT])
(;B[ap]C[RIGHT]))
(;B[ao];W[an];B[am];W[ap];B[ao]C[RIGHT])
(;B[ap];W[ds]
(;B[an]C[RIGHT])
(;B[ao]C[RIGHT]))
(;B[ds];W[ap];B[as];W[cs];B[bs];W[cs]))
(;B[ap];W[bm]))
(;B[ap];W[ao]
(;B[bn];W[bs];B[an]C[RIGHT];W[aq];B[ap]C[RIGHT])
(;B[aq];W[bs]))
(;B[ao];W[bn]
(;B[bm];W[an]
(;B[am];W[ap]
(;B[aq]C[RIGHT])
(;B[bs];W[ds]C[seki]))
(;B[aq];W[bs];B[am]C[RIGHT];W[ap];B[ao]C[RIGHT])
(;B[ap];W[aq];B[am];W[bs])
(;B[bs];W[ds]
(;B[am];W[ap]C[seki])
(;B[aq];W[ap])))
(;B[an];W[bm])
(;B[aq];W[bm]))
(;B[an];W[bs]
(;B[bn];W[aq])
(;B[aq];W[ap])
(;B[ao];W[aq])
(;B[ap];W[aq])))
(;B[aq];W[ar]
(;B[as];W[ap];B[bn];W[ar]C[ko])
(;B[bn];W[ap]
(;B[an];W[cs])
(;B[bs];W[ds]))
(;B[bs];W[ap];B[bn];W[ds]))
(;B[bn];W[ar]
(;B[ao];W[bs])
(;B[bs];W[ds]))
(;B[ao];W[ar];B[bn];W[bs])
(;B[ap];W[ar];B[ao];W[bs];B[bn];W[cs])
(;B[an];W[ar])
(;B[as];W[aq]
(;B[bn];W[cs];B[ao];W[ds];B[an];W[bs])
(;B[cs];W[ds];B[bn];W[ar]))
(;B[ds];W[ar]
(;B[bs];W[aq];B[bn];W[as])
(;B[cs];W[es])
(;B[bn];W[bs])))