invalid problem set
Problem | 12402 |
Created | 2009-02-17 |
Source | Showed by YinKuo 3p on KGS |
Rating | |
Difficulty | 8 dan |
Average Solve Time | 57 secs |
User Attempts |
23 / 184 |
Solve Ratio Rating | 2 dan |
| rating history |
An interesting problem. In many of blacks wrong variations, the correct killing sequence for white is often elusive.
Enjoy.
(;AB[pb]AB[pd]AB[qd]AB[rd]AW[re]AW[qe]AW[pe]AW[od]AW[ob]AW[ne]AW[nb]C[black first. Do the best you can!]AP[goproblems]
(;B[rb];W[pa]
(;B[ra]
(;W[qb]C[CHOICE]
(;B[pc];W[sd];B[sc];W[qa]
(;B[qc];W[oa];B[se]C[RIGHT])
(;B[oa];W[na];B[qc]C[RIGHT]))
(;B[sc];W[qc])
(;B[sb];W[pc])
(;B[sd];W[pc]C[RIGHT]
(;B[qc];W[se]
(;B[sb]C[RIGHT])
(;B[sc]C[RIGHT]))
(;B[sb];W[se]
(;B[qc]C[RIGHT])
(;B[rc]C[RIGHT])))
(;B[qc]C[RIGHT]))
(;W[pc]C[CHOICE];B[qc]
(;W[qb]
(;B[sd];W[se]
(;B[sc]C[RIGHT])
(;B[sb]C[RIGHT]))
(;B[sc];W[se];B[sd]C[RIGHT]))
(;W[sc]C[CHOICE]
(;B[sb];W[sd]
(;B[oc];W[nc];B[qa]C[RIGHT])
(;B[qa]C[fail];W[qb]C[fail]))
(;B[sd];W[sb]
(;B[oc];W[nc];B[qa];W[oa];B[pc]C[RIGHT])
(;B[qa];W[qb]C[fail]))
(;B[oc]C[NOTTHIS])
(;B[qa];W[qb]C[fail]))))
(;B[qa];W[pc];B[qc];W[qb]C[ko. fail.])
(;B[pc];W[ra])
(;B[qb];W[pc];B[qc];W[sc]
(;B[sb];W[sd])
(;B[sd];W[qa]))
(;B[sc];W[ra])
(;B[qc];W[qa])
(;B[sb];W[ra])
(;B[rc];W[ra]))
(;B[qb];W[pa]
(;B[ra];W[sb];B[sc];W[pc])
(;B[qa];W[pc]
(;B[sb];W[ra])
(;B[qc];W[sd]))
(;B[pc];W[rb]
(;B[ra];W[rc];B[sb];W[sc];B[sd];W[sa])
(;B[qa];W[rc];B[sd];W[sb])
(;B[sb]
(;W[rc];B[sc];W[qa];B[ra];W[sa])
(;W[qa];B[ra];W[sa]))))
(;B[pa];W[sb]
(;B[sc];W[rc];B[sd];W[qb])
(;B[rc];W[pc]
(;B[qb];W[ra])
(;B[qc];W[rb]LB[oc:A];B[oc];W[nc]
(;B[pc];W[ra])
(;B[ra];W[sd]))
(;B[rb];W[qc];B[qb];W[ra];B[oc];W[pc]))
(;B[sd];W[rb]
(;B[pc];W[ra])
(;B[ra];W[qb]
(;B[qc];W[rc])
(;B[pc];W[qa])))
(;B[rb];W[sd]))
(;B[sd];W[pc]
(;B[rb];W[qc])
(;B[qb];W[pa]
(;B[qc];W[rb])
(;B[sb];W[ra])
(;B[ra];W[sb])
(;B[qa];W[sb]))
(;B[qc];W[pa]
(;B[qb];W[rb])
(;B[oc];W[nc]
(;B[qa];W[rb]
(;B[sb];W[ra])
(;B[oa];W[sb]))
(;B[rb];W[ra])
(;B[ra];W[rb]))))
(;B[sb];W[pa]
(;B[qb];W[ra]LB[qa:A]LB[pc:B])
(;B[ra];W[qb]
(;B[pc];W[qa];B[rb];W[sd])
(;B[rb];W[sd];B[pc];W[qa])))
(;B[qc];W[rb])
(;B[rc];W[pa];B[qb];W[pc])
(;B[pc];W[rb]C[this is a ko, w first. See Carpenter's Square for clarification.])
(;B[qa];W[sd]
(;B[sc];W[rc]
(;B[sb];W[pc])
(;B[se];W[sb]
(;B[rb];W[qc];B[pc];W[sd])
(;B[sd];W[qb])))
(;B[rc];W[rb])
(;B[rb];W[sb])
(;B[sb];W[rc]
(;B[sc];W[pc])
(;B[rb];W[pc])))
(;B[ra];W[sb]
(;B[sd];W[pc]
(;B[rb];W[qc])
(;B[qc];W[rb];B[pa];W[qb];B[oc];W[nc]
(;B[pc];W[qa])
(;B[qa];W[rc])))
(;B[sc];W[rb];B[qb];W[pc])
(;B[rc];W[pc]
(;B[qb];W[pa])
(;B[pa];W[sd])))
(;B[sc];W[qb]
(;B[qc];W[rb];B[pa];W[sb])
(;B[pa];W[rb]
(;B[ra];W[pc])
(;B[pc];W[sb]
(;B[ra];W[rc])
(;B[rc];W[ra])))))
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