Problem	23416
Created	2021-05-27
Name	Q56 第五十六番
Source	Original （オリジナル）
Rating

Difficulty	8 dan
User Attempts	0 / 43
Solve Ratio Rating	6 dan
	rating history

Two step Ko, advantageous for white
（黒不利な１手ヨセ劫）.

Difficulty level 4 at mimura15.jp

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