Problem 13337 goproblems.com


Author	kaf	Created	2009-12-29
Difficulty	4 dan (history)	Source	dashnet
AVG solve time	39 sec	Stars	4.37 (19 votes)
User attempts	156 / 546	Collections	N/A
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2009-12-29
Source	dashnet
Stars	4.37 (19 votes)
Collections	N/A
Your attempts	N/A

(;AB[br]AB[bq]AB[co]AB[do]AB[eo]AB[fo]AB[go]AB[ho]AB[hp]AB[hr]AB[jr]AB[fr]AW[cs]AW[cr]AW[dq]AW[dp]AW[fp]AW[gp]AW[gq]AW[gr]AW[gs]C[Black to kill (no ko)]AB[hq]AB[bs]AP[goproblems] (;B[dr] (;W[cq]C[CHOICE] (;B[eq] (;W[ep]C[CHOICE] (;B[es]C[Black built an eye and white dies. If e2 was filled, - that would have been a seki.CHOICERIGHT]) (;B[er];W[es]C[seki] (;B[cp];W[fq]C[as i said, - seki]) (;B[hs];W[fq]))) (;W[es];B[ep];W[er];B[fq]C[RIGHT])) (;B[er];W[es] (;B[ep];W[eq]C[seki]) (;B[fs];W[eq]C[]) (;B[ds];W[eq]) (;B[eq];W[ep])) (;B[es];W[eq]C[] (;B[er];W[ep]C[seki]) (;B[ep];W[er]) (;B[hs];W[er]) (;B[cp];W[er])) (;B[ep];W[eq]C[] (;B[er];W[es]C[seki]) (;B[cp];W[er]) (;B[hs];W[er]))) (;W[er];B[eq] (;W[es]C[];B[ep];W[fq];B[cq]C[RIGHT]) (;W[ds];B[ep];W[fq];B[fs];W[es];B[cq]C[RIGHT]) (;W[ep];B[es]C[RIGHT])) (;W[ep];B[es] (;W[cq]C[];B[eq]C[RIGHT]) (;W[eq];B[cq]C[RIGHT]) (;W[fq];B[er]C[RIGHT])) (;W[es];B[cq] (;W[er];B[ds]C[RIGHT]) (;W[ds];B[er]C[RIGHT]) (;W[ep];B[er]C[RIGHT]))) (;B[eq];W[ep] (;B[dr];W[es]C[] (;B[cq];W[er] (;B[ds];W[fq]) (;B[fq];W[ds])) (;B[er];W[cq]C[seki])) (;B[er];W[cq]C[] (;B[fs];W[dr]C[]LB[es:ko] (;B[es]C[seki]) (;B[ds];W[fq]) (;B[cp]C[white can either start ko with e1 or wait for black to do it (I believe, it is called 'man en ko' - 'a 10000-year ko' in Japan)]) (;B[hs]C[NOTTHIS])) (;B[es]C[seki]) (;B[dr])) (;B[es];W[dr]C[];B[er]C[seki])) (;B[er];W[es]C[] (;B[dr];W[cq]) (;B[ep];W[eq] (;B[cq];W[dr]) (;B[dr];W[cq]C[seki] (;B[hs];W[fq]) (;B[fq];W[ds]) (;B[cp];W[fq])) (;B[fs];W[dr]C[];B[ds];W[fq])) (;B[fs];W[dr]C[] (;B[ep];W[eq]) (;B[ds];W[ep] (;B[es]C[seki]) (;B[cp];W[es]C[ko]) (;B[cq]C[ko];W[es]) (;B[hs]C[ko];W[es]))) (;B[cq];W[dr] (;B[fs];W[fq];B[ds];W[eq]) (;B[ep];W[eq]))) (;B[es];W[er]C[] (;B[eq];W[ds]C[ko is not a solution] (;B[ep];W[fq]C[ko]) (;B[dr]C[koNOTTHIS]) (;B[cq];W[fs]) (;B[fq];W[ep]C[ko])) (;B[fs];W[ds]) (;B[cq];W[fs]) (;B[ep];W[eq] (;B[fs];W[ds]) (;B[cq];W[fs])) (;B[fq];W[eq])) (;B[ep];W[eq] (;B[er];W[es]) (;B[es];W[er]) (;B[dr];W[er])) (;B[cq];W[er] (;B[es]) (;B[ep];W[eq]) (;B[ds];W[dr]) (;B[fs];W[es] (;B[dr];W[ep] (;B[ds];W[fq]) (;B[fq];W[ds])) (;B[ep];W[eq]) (;B[eq];W[ep]))))