Problem 9467 goproblems.com


Author	tossy	Created	2006-11-21
Difficulty	3 dan (history)	Source	original
AVG solve time	61 sec	Stars	4.5 (2 votes)
User attempts	235 / 1282	Collections	Corner based
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2006-11-21
Source	original
Stars	4.5 (2 votes)
Collections	Corner based
Your attempts	N/A

(;AW[qc]AW[rc]AW[rd]AW[pc]AW[ob]AW[oa]AB[nb]AB[oc]AB[mc]AB[od]AB[pd]AB[qd]AB[re]AB[qf]AB[rb]C[Black to kill. Ko is failure]AP[goproblems] (;B[qa] (;W[qb]C[CHOICE] (;B[ra];W[sb] (;B[na];W[pb];B[sd]C[RIGHT]) (;B[sd];W[pa]) (;B[pb];W[pa]) (;B[sc];W[pa]) (;B[pa];W[pb])) (;B[pb];W[pa]) (;B[na];W[ra] (;B[pb];W[pa]) (;B[sd];W[sb]) (;B[sb];W[pa]) (;B[pa];W[pb]) (;B[sa];W[sd] (;B[pb];W[sb]C[You could avoid Ko]) (;B[sc];W[sb]C[You could avoid Ko]) (;B[se];W[pb] (;B[sb]C[You could avoid Seki]) (;B[sc];W[sb]C[You could avoid Ko])) (;B[sb];W[sc] (;B[ra];W[pa]) (;B[pa];W[ra] (;B[sb];W[pb]) (;B[pb];W[sb])) (;B[pb];W[ra] (;B[sb];W[pa]) (;B[pa];W[sb]))) (;B[ra];W[sb]C[You could avoid Ko]) (;B[pa];W[sb]C[You could avoid Ko]))) (;B[sd];W[sb]) (;B[sc];W[sd] (;B[sb];W[ra]) (;B[ra];W[pb]) (;B[pb];W[sb] (;B[ra];W[pa]) (;B[na];W[ra])) (;B[na];W[sb] (;B[pb];W[ra]) (;B[ra];W[pb]C[Seki])) (;B[pa];W[sb]) (;B[se];W[sb])) (;B[sb];W[sc] (;B[na];W[ra]) (;B[ra];W[pa]) (;B[pb];W[pa]) (;B[pa];W[ra])) (;B[pa];W[sb] (;B[sd];W[ra]) (;B[ra];W[sd]) (;B[na];W[ra]))) (;W[sb]C[CHOICE] (;B[ra];W[sd];B[pb]C[RIGHT]) (;B[sd];W[qb]) (;B[qb];W[pb] (;B[sd];W[ra]C[You could avoid Ko]) (;B[ra];W[sd]) (;B[sa];W[sd]C[You could avoid Ko])) (;B[pb];W[qb]) (;B[pa];W[qb] (;B[sd];W[ra]) (;B[ra];W[sd]) (;B[na];W[ra])) (;B[na];W[ra]C[You could avoid Ko]) (;B[sa];W[ra]C[You could avoid Ko]) (;B[sc];W[sd] (;B[na];W[qb] (;B[pb];W[ra]) (;B[ra];W[pb]C[Seki])) (;B[qb];W[pb];B[sa];W[ra]C[You could avoid Ko]) (;B[sa];W[ra]C[You could avoid Ko]) (;B[pb];W[qb] (;B[ra];W[pa]) (;B[na];W[ra])))) (;W[ra] (;B[sb] (;W[qb] (;B[sd]C[RIGHT]) (;B[pa];W[sc]) (;B[na];W[pa])) (;W[sc] (;B[pb]C[RIGHT]) (;B[qb];W[pb] (;B[na]C[RIGHT]) (;B[se];W[pa]) (;B[sa];W[pa]))) (;W[pb] (;B[sd];W[sc] (;B[sa]C[RIGHT]) (;B[qb];W[se] (;B[sf];W[pa]) (;B[rf];W[pa]) (;B[sa];W[pa]) (;B[na];W[rf]C[White may escape...])) (;B[se];W[qb]) (;B[na];W[se] (;B[sf];W[qb]) (;B[qb];W[rf]C[White may escape...]) (;B[rf];W[qb]))) (;B[na];W[sc] (;B[se];W[qb]) (;B[qb]C[RIGHT]))) (;W[pa] (;B[sd];W[sc] (;B[qb];W[se] (;B[na];W[rf]C[White may escape...]) (;B[sf];W[pb])) (;B[na];W[qb]) (;B[se];W[qb])) (;B[qb] (;W[pb];B[sd]C[RIGHT]) (;W[sc] (;B[se];W[pb]) (;B[na]C[RIGHT])) (;W[sd];B[na]C[RIGHT])) (;B[na];W[qb]) (;B[sa];W[qb]C[You could avoid Ko]) (;B[sc];W[sd] (;B[na];W[qb]) (;B[qb];W[pb]) (;B[se];W[qb])))) (;B[qb];W[sb]C[You could avoid Ko]) (;B[pb];W[qb]) (;B[pa];W[sb]C[You could avoid Ko]) (;B[sa];W[qb];B[na];W[sd] (;B[sb];W[pb]C[Seki]) (;B[pb];W[sb]C[You could avoid Ko]) (;B[pa];W[pb] (;B[ra];W[sb]) (;B[se];W[ra];B[qa]C[You could avoid Ko and Seki]))) (;B[sd];W[sb]C[You could avoid Ko]) (;B[sc];W[sd] (;B[pb];W[sb];B[sa];W[qb];B[sc];W[pa];B[na];W[ra]C[White lives with double Ko]) (;B[qb];W[sb]C[You could avoid Ko]) (;B[na];W[qb];B[sa];W[sb]C[You could avoid Ko])))) (;B[pb];W[qb] (;B[qa];W[pa]) (;B[na];W[pa]) (;B[sd];W[sb]) (;B[sb];W[qa]) (;B[ra];W[qa]) (;B[pa];W[qa])) (;B[pa];W[pb]) (;B[qb];W[pb] (;B[sd];W[sb] (;B[ra];W[qa]C[You could avoid Ko]) (;B[qa];W[ra]C[You could avoid Ko])) (;B[qa];W[sb] (;B[ra];W[sd]) (;B[sd];W[ra]C[You could avoid Ko])) (;B[sb];W[qa] (;B[sd];W[sc] (;B[se];W[ra]) (;B[na];W[se])) (;B[sc];W[sd])) (;B[sc];W[sd] (;B[qa];W[sb];B[sa];W[ra]C[You could avoid Ko]) (;B[ra];W[sb]) (;B[sb];W[qa]) (;B[sa];W[qa])) (;B[ra];W[sb] (;B[sd];W[qa]C[You could avoid Ko]) (;B[qa];W[sd]))) (;B[ra];W[qa] (;B[qb];W[pb] (;B[sc];W[sb];B[pa];W[sd]C[You could avoid Ko]) (;B[sb];W[sc]C[You could avoid Ko]) (;B[sd];W[sb]C[You could avoid Ko]) (;B[na];W[sb]C[You could avoid Ko]) (;B[pa]C[];W[sb]C[You could avoid Ko])) (;B[sd];W[sb] (;B[qb];W[pb]C[You could avoid Ko]) (;B[pb];W[qb]) (;B[se];W[qb]) (;B[na];W[qb])) (;B[sc];W[sd] (;B[sb];W[qb]) (;B[qb];W[pb]C[You could avoid Ko])) (;B[sb];W[qb]) (;B[pb];W[qb]) (;B[na];W[qb])) (;B[sb];W[qb] (;B[sd];W[sc] (;B[qa];W[se] (;B[na];W[ra]) (;B[sf];W[ra]) (;B[pb];W[pa]) (;B[pa];W[ra]) (;B[ra];W[pa])) (;B[se];W[qa])) (;B[sc];W[sd]) (;B[qa];W[sc] (;B[pb];W[pa]) (;B[pa];W[ra]) (;B[na];W[ra]) (;B[ra];W[pa])) (;B[ra];W[qa]) (;B[na];W[qa]) (;B[pb];W[qa]) (;B[pa];W[qa])) (;B[sc];W[sd] (;B[qa];W[qb] (;B[na];W[pb]) (;B[ra];W[sb]) (;B[sb];W[ra]) (;B[se];W[sb])) (;B[qb];W[pb] (;B[qa];W[sb];B[sa];W[ra]C[You could avoid Ko]) (;B[sb];W[qa]) (;B[se];W[sb]) (;B[ra];W[sb])) (;B[pb];W[qb]) (;B[ra];W[qb]) (;B[sb];W[qb])) (;B[sd];W[sb] (;B[qb];W[pb] (;B[ra];W[qa]C[You could avoid Ko]) (;B[qa];W[ra]C[You could avoid Ko])) (;B[ra];W[qb] (;B[na];W[qa]) (;B[qa];W[pa]) (;B[pb];W[pa])) (;B[qa];W[qb]) (;B[pb];W[qb]) (;B[pa];W[qa])) (;B[na];W[qb];B[qa];W[ra];B[sa];W[sd] (;B[pb];W[sb]C[You could avoid Ko]) (;B[ra];W[pb] (;B[sb]C[Seki]) (;B[se]C[You could avoid Ko(T17) and Seki(T18)]) (;B[sc];W[sb]C[You could avoid Ko])) (;B[pa];W[pb];B[se];W[ra];B[qa]C[You could avoid Ko and Seki]) (;B[sb];W[sc] (;B[ra];W[pa]) (;B[pb];W[ra] (;B[pa];W[sb]) (;B[sb];W[pa])) (;B[se];W[ra]) (;B[pa];W[ra] (;B[sb];W[pb]) (;B[pb];W[sb])))) (;B[se];W[qb]) (;B[sa];W[qb];B[qa];W[sc] (;B[na];W[sb]) (;B[ra];W[pa]) (;B[pb];W[pa];B[na];W[sb])))