(;AB[bq]AB[bp]AB[cp]AB[dp]AB[ep]AB[fp]AB[dq]AB[dr]AB[gq]AB[hq]AB[br]AW[cq]AW[cr]AW[bs]AW[ds]AW[er]AW[eq]AW[fq]AW[gp]AW[hp]AW[ip]AW[iq]AW[hr]AW[fo]AW[eo]AW[cn]AW[bn]C[Black to play and live]AP[goproblems]
(;B[fs]
(;W[fr]C[];B[ar];W[es];B[as]C[RIGHT])
(;W[gs]C[CHOICE];B[ar];W[gr];B[as]C[Correct !
White can use E1 as a big ko threat while Black has no real threatsRIGHT]))
(;B[fr];W[gr];B[cs];W[cr])
(;B[cs];W[cr];B[fr];W[gr])
(;B[ar]
(;W[es];B[as];W[cs];B[gr];W[gs])))