invalid problem set
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life and death
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+3
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Problem | 16402 |
Created | 2012-08-22 |
Source | Problem 3893 & 13730 |
Rating | |
Difficulty | 0.4 kyu |
Average Solve Time | 43 secs |
User Attempts |
303 / 984 |
Solve Ratio Rating | 4 kyu |
| rating history |
In problem 3893 a situation may arise where White needs to ignore N19.
(;AW[pa]AW[ob]AW[nb]AW[pc]AW[qc]AW[rc]AW[rd]AB[re]AB[qf]AB[qd]AB[pd]AB[oc]AB[mb]AB[ma]AB[na]MA[ma]AB[mc]AB[nc]C[White did ignore N19. So, now what? Play at N14 (Tenuki) if you think White can not be killed.FORCE]LB[mf:Tenuki]AP[goproblems]
(;B[pb]
(;W[qb]
(;B[ra];W[rb]
(;B[sd];W[oa])
(;B[oa];W[sd]
(;B[sb]C[Dead by bent 4 in the corner.RIGHT])
(;B[pb];W[qa]
(;B[sb];W[sa]C[Ko])
(;B[ob];W[sb])))
(;B[sb];W[oa])
(;B[sc];W[oa]))
(;B[oa];W[ra]
(;B[pb];W[ob])
(;B[sb];W[pb])
(;B[sd];W[sb]))
(;B[sb];W[ra];B[oa];W[pb])
(;B[sd];W[ra]
(;B[oa];W[sb])
(;B[sb];W[sc]))
(;B[sc];W[ra]))
(;W[ra]
(;B[qb];W[rb]
(;B[oa]C[White S19 may look a bit weird but R18 is the only correct answer to that. You can explore the Tenuki option to see other possible lines of defense for White.RIGHT])
(;B[sd];W[qa]))
(;B[oa];W[qb]
(;B[sb];W[ob])
(;B[ob];W[sb])
(;B[sd];W[sb])
(;B[qa];W[sb]))
(;B[sd];W[qb]
(;B[oa])
(;B[sb];W[sc]))
(;B[sb];W[qb];B[oa])
(;B[rb];W[qb])
(;B[qa];W[qb])
(;B[sc];W[qb])
(;B[sa];W[qb])))
(;B[oa];W[ra]
(;B[pb];W[qb]
(;B[sb];W[ob])
(;B[ob];W[sb])
(;B[sd];W[sb])
(;B[qa];W[sb]))
(;B[qb];W[pb])
(;B[sd];W[sb])
(;B[sb];W[qb]
(;B[pb];W[ob])
(;B[sd];W[sc];B[pb];W[ob])
(;B[rb];W[sc];B[pb];W[ob])
(;B[sc];W[sd]
(;B[se];W[pb])
(;B[pb];W[ob])))
(;B[rb];W[qb]))
(;B[qa];W[ra]
(;B[oa];W[qb]
(;B[pb];W[ob])
(;B[sb];W[pb])
(;B[sd];W[sb]))
(;B[pb];W[qb])
(;B[qb];W[rb])
(;B[rb];W[qb])
(;B[sd];W[qb]
(;B[oa])
(;B[sb];W[sc]))
(;B[sb];W[qb];B[oa]))
(;B[qb];W[qa]
(;B[oa];W[pb]
(;B[rb];W[sb]
(;B[ra];W[sd])
(;B[sd];W[ra]))
(;B[sd];W[rb])
(;B[sb];W[rb])
(;B[sc];W[sd]))
(;B[ra];W[rb])
(;B[rb];W[sb]
(;B[ra];W[sd])
(;B[sd];W[ra])
(;B[oa];W[pb]
(;B[ra];W[sd])
(;B[sd];W[ra])))
(;B[sd];W[rb])
(;B[sb];W[rb]))
(;B[ra];W[rb]
(;B[pb];W[qa]
(;B[sd];W[sa]
(;B[oa];W[sc])
(;B[sc];W[oa]))
(;B[oa];W[sa])
(;B[sa];W[sb]
(;B[sd];W[oa])
(;B[ra];W[sd])
(;B[oa];W[sd]))
(;B[sb];W[sc];B[oa];W[sa])
(;B[sc];W[sd]
(;B[oa];W[qb])
(;B[sb];W[qb])))
(;B[oa]
(;W[pb];B[qa];W[sd])
(;W[qa]
(;B[pb];W[sa])
(;B[sd];W[sa]
(;B[pb];W[sc])
(;B[sc];W[pb]))
(;B[qb];W[pb])
(;B[sb];W[sc])))
(;B[qa];W[qb]
(;B[oa];W[sa])
(;B[sd];W[sa]
(;B[sc];W[oa])
(;B[oa];W[sc]))
(;B[sa];W[sb])
(;B[sb];W[sc]))
(;B[qb];W[qa])
(;B[sd];W[qa]
(;B[pb];W[sa]
(;B[oa];W[sc])
(;B[sc];W[oa]))
(;B[oa];W[sa]
(;B[pb])
(;B[sc];W[pb]))
(;B[sb];W[sc])
(;B[sc];W[sa]))
(;B[sb];W[qa]
(;B[pb];W[sc];B[oa];W[sa])
(;B[oa];W[sc])
(;B[sd];W[sc])
(;B[qb];W[pb]))
(;B[sc];W[qa]
(;B[pb];W[sd]
(;B[oa];W[qb])
(;B[sb];W[qb]))
(;B[oa];W[pb])
(;B[sd];W[sa])))
(;B[rb];W[ra]
(;B[pb];W[qb])
(;B[oa];W[qb])
(;B[qb];W[sb])
(;B[sd];W[sb])
(;B[sb];W[qb]
(;B[oa];W[sc];B[pb];W[ob])
(;B[sd];W[sc]
(;B[oa];W[sa];B[pb];W[ob])
(;B[se];W[oa]))
(;B[sc];W[sd]))
(;B[sc];W[sd]
(;B[sa];W[qa]
(;B[oa];W[sb])
(;B[sb];W[qb]))
(;B[qb];W[sb])
(;B[oa];W[sb]
(;B[pb];W[qb])
(;B[qb];W[pb]))
(;B[sb];W[qb])))
(;B[sd];W[ra]
(;B[pb];W[qb])
(;B[oa];W[sb])
(;B[qb];W[rb])
(;B[sc];W[sb])
(;B[sb];W[sc]
(;B[oa];W[qb];B[pb];W[ob])
(;B[rb];W[qb]
(;B[oa];W[sa];B[pb];W[ob])
(;B[se];W[oa]))
(;B[qb];W[rb]))
(;B[rb];W[sb]))
(;B[sc];W[sb]
(;B[rb];W[sd]
(;B[qb];W[ra])
(;B[ra];W[qb];B[oa];W[qa])
(;B[qa];W[qb])
(;B[oa];W[ra]
(;B[pb];W[qb])
(;B[qb];W[pb]))
(;B[pb];W[qb]))
(;B[qb];W[pb]
(;B[rb];W[sd])
(;B[sd];W[se]
(;B[sd];W[ra])
(;B[ra];W[sd])))
(;B[oa];W[qb]
(;B[ra];W[sd])
(;B[pb];W[ob]))
(;B[pb];W[qb])
(;B[ra];W[sd]
(;B[oa];W[qb])
(;B[pb];W[qb])
(;B[rb];W[qb];B[oa];W[qa])
(;B[qb];W[rb])
(;B[qa];W[rb]))
(;B[qa];W[ra])
(;B[sd];W[ra]))
(;B[sb];W[ra]
(;B[pb];W[qb])
(;B[oa];W[qb]
(;B[pb])
(;B[sd];W[sc];B[pb];W[ob])
(;B[rb];W[sc];B[pb];W[ob])
(;B[sc];W[sd]
(;B[se];W[pb])
(;B[pb];W[ob])))
(;B[qb];W[rb])
(;B[sd];W[sc]
(;B[oa];W[qb])
(;B[rb];W[qb])
(;B[qb];W[rb]))
(;B[rb];W[qb]
(;B[oa])
(;B[sd];W[sc]
(;B[oa];W[sa];B[pb];W[ob])
(;B[se];W[oa]))
(;B[sc];W[sd]))
(;B[sc];W[sd]))
(;B[mf]AW[ma]AW[na]AW[mb]AW[mc]AW[nc]AW[oc]AW[pd]AW[qd]AW[re]AW[qf]AW[mf]AB[pa]AB[ob]AB[nb]AB[pc]AB[qc]AB[rc]AB[rd];W[pb]C[Okay, so if we swap sides and White plays Q18 how do you live?]
(;B[qb];W[ra]
(;B[sb];W[sd]
(;B[qa];W[oa])
(;B[oa];W[qa]))
(;B[oa];W[qa])
(;B[qa];W[oa])
(;B[sd];W[sb]
(;B[oa];W[qa]
(;B[pb];W[rb])
(;B[rb];W[pb])
(;B[sc];W[pb]))
(;B[rb];W[oa]C[Dead by bent 4 in the corner.]))
(;B[rb];W[oa]
(;B[sd];W[sb])
(;B[sa];W[sb]
(;B[sd]C[Dead by bent 4 in the corner])
(;B[sc];W[sa])
(;B[qa];W[sa])
(;B[pb];W[sd]))))
(;B[ra];W[qb]
(;B[qa];W[oa])
(;B[rb];W[oa])
(;B[sb];W[oa])
(;B[sd];W[rb])
(;B[oa];W[qa]
(;B[ob];W[oa])
(;B[rb];W[ob])
(;B[sd];W[rb])))
(;B[sb];W[qb]
(;B[rb];W[oa])
(;B[ra];W[oa])
(;B[oa];W[qa])
(;B[qa];W[oa])
(;B[sd];W[rb]
(;B[ra];W[oa])
(;B[oa];W[se])
(;B[qa];W[oa])))
(;B[sd];W[qb]
(;B[rb];W[oa])
(;B[ra];W[rb])
(;B[oa];W[rb])
(;B[qa];W[rb]))
(;B[rb];W[oa]
(;B[qa];W[sd])
(;B[sd];W[qa]))
(;B[qa];W[oa]
(;B[rb];W[sd])
(;B[sd];W[qb])
(;B[sb];W[qb])
(;B[qb];W[sb]))
(;B[oa];W[qa]
(;B[qb];W[sb])
(;B[ra];W[sb])
(;B[sb];W[qb]))
(;B[sc];W[qb])))
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