Problem | 7058 |
Created | 2005-08-10 |
Source | |
Rating | |
Difficulty | 7 dan |
Average Solve Time | 72 secs |
User Attempts |
119 / 1367 |
Solve Ratio Rating | 4 dan |
| rating history |
(;AW[ao]AW[bo]AW[cp]AW[bq]AW[aq]AW[dq]AW[dr]AB[es]AB[er]AB[eq]AB[ep]AB[dp]AB[do]AB[co]AB[cn]AB[bn]AB[an]C[Black to kill the corner (with ko).]AP[goproblems]
(;B[ds];W[cr])
(;B[cs];W[cr]
(;B[ds];W[bs])
(;B[bs];W[br])
(;B[br];W[bs];B[as];W[ar]))
(;B[bs];W[br]
(;B[ds];W[cr])
(;B[cr];W[ds])
(;B[cs];W[cr]))
(;B[as];W[br])
(;B[ar];W[br])
(;B[br];W[cr]
(;B[bs];W[ds])
(;B[cs];W[bs];B[as];W[ar]))
(;B[cr];W[br]
(;B[ds];W[bs]
(;B[cq];W[bp])
(;B[bp];W[cq]
(;B[ap];W[cs])
(;B[cs];W[ap]))
(;B[cs];W[cq]))
(;B[bp];W[cq]
(;B[ap];W[cs])
(;B[cs];W[ds]))
(;B[cs];W[bs]
(;B[bp];W[cq]
(;B[ds];W[ap])
(;B[ap];W[ds]))
(;B[ds];W[cq]))
(;B[bs];W[ds]))
(;B[cq];W[cr])
(;B[ap];W[bp])
(;B[bp]
(;W[cr]
(;B[ap];W[bs])
(;B[bs];W[ap])
(;B[ds];W[ap])
(;B[cq]MA[cp];W[bs]
(;B[ar];W[ds])
(;B[ap];W[ds])
(;B[cp];W[ds])
(;B[ds];W[cp]MA[cq]LB[fm:K]C[(play K for ko threat)]
(;B[cq]C[NOTTHIS])
(;B[ap];W[ar])
(;B[fm];W[fn];B[cq];W[ar]
(;B[ap];W[cs])
(;B[cs];W[cp]C[(play K for ko threat)]MA[cq]LB[gm:K]
(;B[cq]C[NOTTHIS])
(;B[gm];W[gn];B[cq]MA[cp]C[Good work! :)RIGHT])
(;B[ap];W[cq]))
(;B[cp];W[cs])))))
(;W[ap]C[This is a mistake.];B[cr];W[br];B[ds];W[cq];B[bs];W[cs]MA[cr]C[Now black only needs 1 ko threat instead of 2.])))
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