Problem	22028
Created	2018-12-16
Name	Q42 第四十二番
Source	Original （オリジナル）
Rating

Difficulty	8 dan
Average Solve Time	62 secs
User Attempts	17 / 122
Solve Ratio Rating	2 dan
	rating history

42. Ko problem （黒先劫） Difficulty level 3 at mimura15.jp

(;AB[ap]AB[dp]AB[ds]AW[an]AW[bn]AW[cn]AW[dn]AW[en]AW[fn]AW[fo]AW[fp]AW[fq]AW[gq]AW[gr]AW[gs]AP[goproblems] (;B[cq];W[ar] (;B[br];W[bp] (;B[bq];W[dr];B[er] (;W[eq];B[dq];W[es] (;B[fs];W[fr] (;B[cr];W[es]C[RIGHT]) (;B[cs];W[es] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[bo];B[as];W[bs]C[RIGHT]) (;B[bo];W[co] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[ao];B[as];W[bs]C[RIGHT]))) (;B[as];W[es];B[cs];W[bs]C[RIGHT]) (;B[cp];W[es];B[cs];W[bo];B[as];W[bs]C[RIGHT]) (;B[bo];W[es];B[cs];W[co] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[ao];B[as];W[bs]C[RIGHT]))) (;B[cs];W[fr] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[bo];B[as];W[bs]C[RIGHT]) (;B[bo];W[co] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[ao];B[as];W[bs]C[RIGHT]))) (;B[cr];W[fr]C[RIGHT])) (;W[es] (;B[fs];W[eq] (;B[dq];W[fr] (;B[cr];W[es]C[RIGHT]) (;B[cs];W[es] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[bo];B[as];W[bs]C[RIGHT]) (;B[bo];W[co] (;B[as];W[bs]C[RIGHT]) (;B[cp];W[ao];B[as];W[bs]C[RIGHT]))) (;B[as];W[es];B[cs]) (;B[cp];W[es];B[cs]) (;B[bo];W[es];B[cs])) (;B[cp]C[NOTTHISRIGHT]) (;B[bo]C[NOTTHISRIGHT]) (;B[co]C[NOTTHISRIGHT])) (;B[cs];W[eq] (;B[as];W[bs]C[RIGHT]) (;B[dq];W[fr]) (;B[cp]C[NOTTHISRIGHT]) (;B[bo]C[NOTTHISRIGHT])))) (;B[aq];W[bq];B[as];W[cp]) (;B[er];W[bq])) (;B[bq];W[br] (;B[cr];W[eq]) (;B[bs];W[dr];B[er];W[eq]) (;B[dr];W[bs];B[eq];W[er];B[ep];W[cr];B[aq];W[es]) (;B[er];W[eq];B[dq];W[cr];B[dr];W[bs]) (;B[eq];W[er];B[dr];W[bs];B[ep];W[cr];B[aq];W[es])) (;B[bp];W[br] (;B[bs];W[dr];B[er];W[eq]) (;B[cr];W[er];B[dr];W[bs];B[co];W[bo];B[do];W[bq];B[cs];W[ao]) (;B[dr];W[bs] (;B[co];W[eq];B[dq];W[bo];B[do];W[bq]) (;B[eq];W[co];B[cp];W[er];B[ep];W[cr])) (;B[er];W[eq];B[dq];W[cr];B[dr];W[bs];B[co];W[bo];B[do];W[bq]) (;B[eq];W[er];B[dr];W[bs] (;B[ep];W[co];B[cp];W[cr]) (;B[co];W[bo] (;B[do];W[bq];B[ep];W[cr]) (;B[ep];W[cr];B[do];W[bq])))) (;B[bo];W[bq] (;B[co];W[cr]) (;B[br];W[cr] (;B[bs];W[cp];B[dq];W[co]) (;B[bp];W[bs];B[dr];W[co])) (;B[bp];W[cr];B[dr];W[co]))) (;B[bq];W[cr]) (;B[cr];W[bq]) (;B[bp];W[cq]) (;B[dr];W[cq]) (;B[cp];W[dq];B[cq];W[dr];B[cr];W[bo]) (;B[dq];W[cp];B[cq];W[bp];B[bq];W[er]) (;B[br];W[cq]))