(;AW[ip]AW[iq]AW[ir]AW[is]AW[fp]AW[ep]AW[eq]AW[er]AW[en]AW[fn]AB[gp]AB[fq]AB[hq]AB[fr]AB[gn]AB[hn]AB[hl]AB[fl]AB[jo]AB[kp]AB[kq]AB[kr]AB[ks]AB[kn]MA[ip]MA[iq]MA[ir]MA[is]C[White to save the marked stones unconditionally]AW[cn]AP[goproblems]
(;W[gr]
(;B[gs]C[CHOICE]
(;W[hs];B[fs]
(;W[go];B[ho]
(;W[hp];B[fo];W[gq];B[hr];W[gq];B[gr];W[es]C[RIGHT])
(;W[gq];B[hr];W[hp];B[fo]))
(;W[gq];B[hr];W[go];B[ho];W[hp];B[fo];W[gq];B[gr];W[es]C[RIGHT]))
(;W[gq];B[hr])
(;W[hr];B[gq])
(;W[go];B[ho];W[hp];B[fo]))
(;B[gq]C[for explanation purposes]
(;W[go];B[ho];W[hp];B[fo];W[fs];B[hr];W[gs]C[RIGHT])
(;W[fs];B[hr];W[gs];B[hs];W[go];B[es];W[ho]C[RIGHT])))
(;W[go];B[ho]
(;W[hp];B[fo]
(;W[gr];B[gs]
(;W[hs];B[fs];W[gq];B[hr];W[gq];B[gr];W[es]C[RIGHT])
(;W[gq];B[hr]))
(;W[fs];B[gs];W[gr];B[es];W[hs];B[gq];W[fs]C[Ko])
(;W[hr];B[gq])
(;W[gs];B[fs]))
(;W[gr];B[gs]
(;W[hp];B[fo]
(;W[hs];B[fs];W[gq];B[hr];W[gq];B[gr];W[es]C[RIGHT])
(;W[gq];B[hr]))
(;W[hs];B[fs]
(;W[hp];B[fo];W[gq];B[hr];W[gq];B[gr];W[es]C[RIGHT])
(;W[gq];B[hr]))
(;W[gq];B[hr])))
(;W[fs];B[gs];W[gr];B[es];W[hs];B[gq];W[fs]C[Ko])
(;W[gs];B[fs])
(;W[hs];B[fs])
(;W[hr];B[gq])
(;W[hp];B[go]
(;W[gr];B[gs];W[hs];B[fs];W[gq];B[hr];W[gq];B[gr];W[es];B[gq])
(;W[hr];B[gq])
(;W[fs];B[gs];W[gr];B[es];W[hs];B[fs];W[gq];B[hr];W[gq];B[gr];W[ds];B[gq])
(;W[gs];B[fs]))
(;W[gq];B[gr])
(;W[ho];B[go]))