Problem 4341 goproblems.com


Author	cusp	Created	2004-04-25
Difficulty	12 kyu (history)	Source	A game with my dad
AVG solve time	48 sec	Stars	4.24 (17 votes)
User attempts	2783 / 8288	Collections	Basic Shape, Corner based
Genre	life and death	Your attempts	N/A
Similar problems
Created	2004-04-25
Source	A game with my dad
Stars	4.24 (17 votes)
Collections	Basic Shape, Corner based
Your attempts	N/A

(;AB[aq]AB[bq]AB[cq]AB[dr]AB[er]AW[fr]AW[fq]AW[eq]AW[dq]AW[dp]AW[cp]AW[bp]AW[ap]C[White to kill. Ko is not enough. Play P if you think black can't save this group even if white plays elsewhere (tenuki).]LB[ho:P]AP[goproblems] (;W[ar];B[br] (;W[cr];B[cs]C[Black lives.]) (;W[as];B[cs]C[Black lives.]) (;W[bs];B[cr] (;W[as];B[cs]C[Black lives.]) (;W[cs];B[as]C[Ko.]) (;W[ds];B[as]C[Ko.]) (;W[es];B[as]C[Ko.]) (;W[fs];B[cs]C[Black lives.])) (;W[cs];B[bs]C[Black lives.]) (;W[ds];B[cs]C[Black lives.]) (;W[es];B[cs]C[Black lives.]) (;W[fs];B[cs]C[Black lives.])) (;W[br]C[];B[cr] (;W[ar];B[es]C[Black lives.]) (;W[as];B[ar] (;W[bs];B[cs]C[Black lives.]) (;W[cs];B[bs]C[Black lives.]) (;W[ds];B[bs]C[Black lives.]) (;W[es];B[bs]C[Black lives.]) (;W[fs];B[bs]C[Black lives.])) (;W[bs]C[] (;B[ar]C[CHOICE] (;W[as];B[cs]C[Black lives.]) (;W[cs]C[Black is dead!RIGHT]) (;W[ds];B[es]C[Black lives.]) (;W[es]C[Black is dead!RIGHT]) (;W[fs];B[es] (;W[as];B[cs]C[Black lives.]) (;W[cs]C[Black is dead!RIGHT]) (;W[ds];B[cs]C[Black lives.]))) (;B[cs]C[CHOICE] (;W[ar];B[es]C[Black lives.]) (;W[as];B[es]C[Black lives.]) (;W[ds];B[es]C[Black lives.]) (;W[es]C[Black is dead!RIGHT]) (;W[fs];B[es]C[Black lives.])) (;B[es]C[CHOICE] (;W[ar];B[cs]C[Black lives.]) (;W[as];B[cs]C[Black lives.]) (;W[cs]C[Black is dead!RIGHT]) (;W[ds];B[cs]C[Black lives.]) (;W[fs];B[cs]C[Black lives.]))) (;W[cs]C[] (;B[ar]C[CHOICE] (;W[as];B[bs]C[Black lives.]) (;W[bs]C[Black is dead!RIGHT]) (;W[ds];B[bs]C[Black lives.]) (;W[es];B[bs]C[Black lives.]) (;W[fs];B[bs]C[Black lives.])) (;B[as]C[CHOICE] (;W[ar];B[bs]C[Black lives.]) (;W[bs]C[Black is dead!RIGHT]) (;W[ds];B[es]C[Black lives.]) (;W[es]C[];B[bs] (;W[ar]C[Black is dead!RIGHT]) (;W[ds];B[fs]C[Black lives.]) (;W[fs];B[ds]C[Black lives.])) (;W[fs];B[bs] (;W[ar];B[bs] (;W[as];B[bs]C[Black lives.]) (;W[ds];B[es]C[Black lives.]) (;W[es]C[Black is dead!RIGHT])) (;W[ds];B[es]C[Black lives.]) (;W[es];B[ds]C[Black lives.]))) (;B[bs]C[CHOICE] (;W[ar];B[ds]C[Black lives.]) (;W[as];B[ar] (;W[bs]C[Black is dead!RIGHT]) (;W[ds];B[bs]C[Black lives.]) (;W[es];B[bs]C[Black lives.]) (;W[fs];B[bs]C[Black lives.])) (;W[ds];B[es]C[Black lives.]) (;W[es];B[ds]C[Black lives.]) (;W[fs];B[ar]C[Black lives.])) (;B[es]C[CHOICE] (;W[ar];B[bs] (;W[as];B[bs]C[Black lives.]) (;W[fs];B[as]C[Black lives.])) (;W[as]C[Black is dead!RIGHT]) (;W[bs]C[Black is dead!RIGHT]) (;W[ds];B[bs]C[Black lives.]) (;W[fs];B[bs]C[] (;W[ar];B[as]C[Black lives.]) (;W[as]C[Black is dead!RIGHT])))) (;W[ds];B[bs]C[Black lives.]) (;W[es];B[bs]C[] (;W[ar]C[Black is dead!RIGHT]) (;W[as];B[ar]C[Black lives.]) (;W[cs];B[ds]C[Black lives.]) (;W[ds];B[ar]C[Black lives.]) (;W[fs];B[ds]C[Black lives.])) (;W[fs];B[bs]C[Black lives.])) (;W[cr];B[br] (;W[ar];B[cs]C[Black lives.]) (;W[as];B[cs]C[Black lives.]) (;W[bs];B[cs]C[Black lives.]) (;W[cs];B[bs]C[Black lives.]) (;W[ds];B[cs]C[Black lives.]) (;W[es];B[cs]C[Black lives.]) (;W[fs];B[cs]C[Black lives.])) (;W[as];B[bs] (;W[ar];B[cr]C[Black lives.]) (;W[br];B[ar]C[Black lives.]) (;W[cr];B[cs]C[Black lives.]) (;W[cs];B[br]C[Black lives.]) (;W[ds];B[cr]C[Black lives.]) (;W[es];B[cr]C[Black lives.]) (;W[fs];B[cr]C[Black lives.])) (;W[bs];B[br] (;W[ar];B[as]MA[ar] (;W[cr];B[cs]C[Black lives.]) (;W[cs];B[cr]C[Ko.]) (;W[ds];B[cs]C[Black lives.]) (;W[es];B[cs]C[Black lives.]) (;W[fs];B[cs]C[Black lives.])) (;W[cr];B[cs]C[Black lives.]) (;W[as];B[cs]C[Black lives.]) (;W[cs];B[as]C[Ko.]) (;W[ds];B[cs]C[Ko.]) (;W[es];B[cs]C[Black lives.]) (;W[fs];B[cs]C[Black lives.])) (;W[cs];B[bs] (;W[ar];B[br]C[Black lives.]) (;W[br];B[ar]C[Ko.]) (;W[cr];B[br]C[Black lives.]) (;W[as];B[br]C[Black lives.]) (;W[ds];B[cr]C[Black lives.]) (;W[es];B[cr]C[Black lives.]) (;W[fs];B[cr]C[Black lives.])) (;W[ds];B[cs] (;W[ar];B[es]C[Black lives.]) (;W[br];B[ar] (;W[cr];B[bs]C[Black lives.]) (;W[as];B[bs]C[Black lives.]) (;W[bs];B[es]C[Black lives.]) (;W[es];B[fs]C[Black lives.]) (;W[fs];B[es]C[Black lives.])) (;W[cr];B[br]C[Black lives.]) (;W[as];B[es]C[Black lives.]) (;W[bs];B[es]C[Black lives.]) (;W[es];B[fs]C[] (;W[ar];B[br]C[Black lives.]) (;W[br];B[ar]C[Black lives.]) (;W[cr];B[br]C[Black lives.]) (;W[as];B[es]C[Black lives.]) (;W[bs];B[es]C[Black lives.]) (;W[ds];B[es]C[Black lives.]) (;W[es];B[br]C[Black lives.]) (;W[gs];B[es]C[Black lives.])) (;W[fs];B[es]C[Black lives.])) (;W[es] (;B[cr]C[CHOICE] (;W[ar]C[Black is dead!RIGHT]) (;W[br];B[bs]C[] (;W[ar]C[Black is dead!RIGHT]) (;W[as];B[ar]C[Black lives.]) (;W[cs];B[ds]C[Black lives.]) (;W[ds];B[ar]C[Black lives.]) (;W[fs];B[ds]C[Black lives.])) (;W[as];B[bs]C[Black lives.]) (;W[bs]C[Black is dead!RIGHT]) (;W[cs];B[bs]C[Black lives.]) (;W[ds]C[Black is dead!RIGHT]) (;W[fs];B[bs]C[Black lives.])) (;B[cs]C[CHOICE] (;W[ar];B[br]C[Black lives.]) (;W[br]C[Black is dead!RIGHT]) (;W[cr];B[br]C[Black lives.]) (;W[as];B[br]C[Black lives.]) (;W[bs];B[br]C[Black lives.]) (;W[ds];B[fs]C[] (;W[ar];B[br]C[Black lives.]) (;W[br]C[];B[ar]C[Black lives.]) (;W[cr];B[br]C[Black lives.]) (;W[as];B[br]C[Black lives.]) (;W[bs];B[br]C[Black lives.]) (;W[ds];B[br]C[Black lives.]) (;W[es];B[br]C[Black lives.]) (;W[gs];B[es]C[Black lives.])) (;W[fs];B[br] (;W[ar];B[as]C[Black lives.]) (;W[as];B[ds]C[Black lives.]) (;W[bs];B[as]C[Black lives.]) (;W[ds];B[as]C[Black lives.])))) (;W[fs];B[br]C[CHOICE] (;W[ar];B[cs]C[Black lives.]) (;W[cr];B[cs]C[Black lives.]) (;W[as];B[cs]C[Black lives.]) (;W[bs];B[cs]C[Black lives.]) (;W[cs];B[cr] (;W[ar];B[as]C[Black lives.]) (;W[as];B[bs]C[Black lives.]) (;W[bs];B[as]C[Ko.]) (;W[ds];B[es]C[Black lives.]) (;W[es];B[ds]C[Black lives.])) (;W[ds];B[cs] (;W[ar];B[as]C[Black lives.]) (;W[as];B[es]C[Black lives.]) (;W[bs];B[es]C[Black lives.]) (;W[es];B[as]C[Black lives.])) (;W[es];B[cs]C[Black lives.] (;W[ar];B[as]C[Black lives.]) (;W[as];B[ds]C[Black lives.]) (;W[bs];B[as]C[Black lives.]) (;W[ds];B[as]C[Black lives.]))) (;W[ho];B[bs] (;W[ar];B[cr]C[Black lives.]) (;W[br];B[cr]C[Black lives.]) (;W[cr];B[br]C[Black lives.]) (;W[as];B[br]C[Black lives.]) (;W[cs];B[cr]C[Black lives.]) (;W[ds];B[cr]C[Black lives.]) (;W[es];B[cr]C[Black lives.]) (;W[fs];B[cr]C[Black lives.])))