Problem	22017
Created	2018-09-29
Name	Q31 第三十一番
Source	Original （オリジナル）
Rating

Difficulty	8 dan
Average Solve Time	209 secs
User Attempts	3 / 63
Solve Ratio Rating	5 dan
	rating history

31. Ko problem （黒先劫） Please note that two step Ko, disadvantageous for balck, is not a correct answer. （黒不利な１手ヨセ劫は不正解）. Difficulty level 1 at mimura15.jp

(;AB[al]AB[bm]AB[cn]AB[cl]AB[do]AB[eo]AB[ep]AB[fq]AB[gq]AB[hr]AB[is]AB[iq]AB[cq]AW[cp]AW[dq]AW[br]AW[bs]AP[goproblems] (;B[bq];W[bp] (;B[dr];W[dp];B[cr];W[er] (;B[ap];W[ao] (;B[ar];W[aq]C[RIGHT]) (;B[eq];W[ds]) (;B[aq];W[bo] (;B[es];W[fs] (;B[cs];W[ds]) (;B[eq];W[ds];B[fr];W[es])) (;B[eq];W[ds]) (;B[fr];W[ds])) (;B[bo];W[aq]) (;B[fr];W[ds]) (;B[es];W[ds];B[ar];W[fs];B[bo];W[cs];B[an];W[aq])) (;B[aq];W[ap] (;B[es];W[fs];B[cs];W[ds]) (;B[eq];W[ds]) (;B[fr];W[ds])) (;B[ar];W[ds];B[ap];W[bo]) (;B[eq];W[ds]) (;B[fr];W[ds]) (;B[es];W[ds])) (;B[dp];W[dr])) (;B[bp];W[bq]) (;B[cr];W[dr];B[bp];W[bq];B[dp];W[cs];B[cq];W[fr]) (;B[dr];W[cr];B[dp];W[bq];B[er];W[bo]))