Problem	14928
Created	2011-06-21
Source	inspired by problem 14924(sandboxed)
Rating

Difficulty	9 dan
Average Solve Time	80 secs
User Attempts	7 / 99
Solve Ratio Rating	4 dan
	rating history

both players don't have any external ko threats.

(;AB[bq]AB[dq]AB[eq]AB[er]AB[fr]AW[bo]AW[co]AW[cp]AB[bn]AB[cn]AB[am]AB[bl]AB[dn]AW[eo]AW[ep]AW[gr]AW[hr]AW[fs]AW[gq]AB[fq]AB[fp]AW[fo]AW[gp]AW[go]TR[dq]TR[eq]TR[er]TR[fr]TR[fq]TR[fp]C[the target is marked.]AP[goproblems] (;W[cq];B[cr] (;W[bs];B[br];W[es];B[aq]LB[ap:A]C[FORCE];W[ap];B[as];W[ar];B[cs]) (;W[es];B[ds] (;W[bs];B[gs];W[br];B[cs];W[aq];B[fs]) (;W[gs];B[bs])) (;W[br];B[bs]) (;W[ds];B[es];W[br];B[bs])) (;W[es];B[ds] (;W[cq];B[cr] (;W[bs];B[gs];W[br];B[cs];W[aq];B[fs]) (;W[gs];B[bs])) (;W[gs];B[bs] (;W[cq];B[cr]) (;W[ar];B[aq];W[cr];B[cq];W[br];B[ao]) (;W[cr];B[cq];W[ar];B[aq];W[br];B[ao]))) (;W[bs];B[cq] (;W[es];B[ds];W[gs];B[cr];W[cs];B[br];W[dr];B[ao];W[ap];B[bp];W[an];B[ds]C[double ko]) (;W[aq];B[ap];W[bp];B[ar];W[ao];B[cr]) (;W[cr];B[aq];W[ap];B[br]) (;W[ds];B[es] (;W[cr];B[aq];W[ap];B[br]) (;W[aq];B[ap];W[bp];B[ar];W[ao];B[cr])) (;W[ap];B[cr];W[ds];B[es];W[ar];B[aq];W[cs];B[br];W[dp];B[gs];W[bp];B[as]C[double ko])) (;W[ap];B[cr] (;W[aq];B[ar];W[bs];B[br]) (;W[bs];B[cq];W[ds];B[es];W[ar];B[aq];W[cs];B[br];W[dp];B[gs];W[bp];B[as]C[double ko])) (;W[br];B[cr] (;W[ar];B[bs]) (;W[aq];B[bs]) (;W[cq];B[bs])) (;W[ar];B[aq];W[cq];B[cr];W[ap];B[br]) (;W[bp];B[cr] (;W[cq];B[br];W[es];B[ds];W[gs];B[bs]) (;W[bs];B[ds];W[br];B[cq];W[aq];B[ar])) (;W[cs];B[cr] (;W[es];B[ds];W[dr];B[bs]) (;W[bs];B[ds];W[gs];B[es];W[cq];B[br]) (;W[ds];B[es];W[bs];B[br])) (;W[cr];B[cq] (;W[br];B[ao];W[ap];B[bp];W[an];B[do];W[dp];B[ao]) (;W[bs];B[aq];W[ap];B[br]) (;W[aq];B[ap] (;W[bp];B[ar];W[ao];B[bs]) (;W[ao];B[ar] (;W[bs];B[ds]) (;W[ds];B[bs];W[es];B[dr];W[cs];B[bp])))) (;W[aq];B[ar]C[] (;W[cr];B[cq];W[ap];B[br] (;W[ds];B[bs]) (;W[bs];B[ds])) (;W[ap];B[cr];W[bs];B[br]) (;W[br];B[cr];W[as];B[ap] (;W[ao];B[ar]C[]) (;W[cq];B[ar])) (;W[ds];B[ao];W[br];B[cq];W[as];B[bp])) (;W[ds] (;B[es]C[CHOICE] (;W[br];B[cr]) (;W[cr];B[cq] (;W[br];B[aq];W[ap];B[bs]) (;W[bs];B[aq];W[ap];B[br]) (;W[aq];B[ap] (;W[ao];B[br];W[bp];B[bs];W[ar];B[cs]) (;W[bp];B[ar];W[ao];B[bs]))) (;W[cq];B[cr];W[br];B[bs]) (;W[bs];B[cr];W[cs];B[br]) (;W[aq] (;B[ap]C[CHOICE] (;W[cq];B[cr];W[br];B[ar];W[bs] (;B[dr]C[CHOICE] (;W[bp]C[];B[cs];W[aq]C[RIGHT]) (;W[ao];B[cs];W[bp];B[as];W[br];B[bs];W[aq]C[];B[do];W[dp];B[ap]) (;W[dp]C[NOTTHIS])) (;B[ao];W[cs]C[RIGHT])) (;W[ar];B[br];W[bp];B[as];W[aq];B[cs];W[cr];B[cq];W[bs];B[ar];W[ao];B[dr]) (;W[ao];B[cr];W[bp];B[ar])) (;B[ar] (;W[cr];B[cq];W[ap] (;B[bs];W[br];B[dr];W[as]C[];B[do];W[dp]C[RIGHT]) (;B[dr];W[br];B[bs];W[as]C[];B[do];W[dp]C[RIGHT])) (;W[br] (;B[cr];W[as];B[ap];W[cq];B[ar];W[dp];B[gs];W[aq]C[RIGHT]) (;B[ap];W[cq];B[cr];W[bs] (;B[dr]C[CHOICE] (;W[bp]C[];B[cs];W[aq]C[RIGHT]) (;W[ao];B[cs];W[bp];B[as];W[br];B[bs];W[aq]C[];B[do];W[dp];B[ap]) (;W[dp]C[NOTTHIS])) (;B[ao];W[cs]C[RIGHT])))) (;B[cr];W[ar];B[bp];W[ap];B[ao];W[an];B[do];W[dp];B[ao];W[br];B[cq];W[an]C[RIGHT]) (;B[cq];W[ap];B[ar];W[br];B[bs];W[as] (;B[bp];W[ar];B[ao];W[an];B[do];W[dp];B[ao];W[cr]C[RIGHT]) (;B[do];W[dp];B[ar];W[cr]C[RIGHT])))) (;B[cq];W[ap];B[es];W[aq];B[ar];W[br];B[bs];W[as] (;B[bp];W[ar];B[ao];W[an];B[do];W[dp];B[ao];W[cr]C[RIGHT]) (;B[do];W[dp];B[ar];W[cr]C[RIGHT])) (;B[ap];W[cq];B[cr];W[br];B[bs];W[ar];B[aq];W[ao];B[as];W[es]C[RIGHT]) (;B[dr];W[cq];B[cr];W[ap];B[cs];W[ar]C[RIGHT]) (;B[cs];W[cq];B[cr];W[ap];B[es];W[ar]C[RIGHT]) (;B[cr];W[es];B[ao];W[ap];B[bp];W[an];B[do];W[dp];B[ao];W[cq]C[RIGHT])))