(;FF[4]GM[1]CA[UTF-8]AP[goproblems:0.1.0]SZ[19]ST[0]AB[ar][bq][cq][cr][as][dr][er][es][eq][ep][is][ir][iq][ip][jr][kr][kq][lq][mr][ms]AW[aq][ap][bp][cp][do][cn][eo][fo][gp][gr][gq][gs][ho][io][jo][kn][kp][lp][mp][mq][nq][nr][ns]C[Only one of the two identical-looking groups can be killed. Kill it, and don't waste ko threats on the other one.](;W[ks](;B[js]C[CHOICE](;W[ls];B[lr];W[jp]C[RIGHT])(;W[jp];B[ls]))(;B[jp];W[lr];B[ls];W[lr])(;B[lr];W[jp]))(;W[ls];B[lr](;W[ks];B[jp])(;W[jp];B[ks]))(;W[jp];B[ks])(;W[cs];B[ds](;W[bs];B[dp];W[br];B[ar];W[as];B[ar])(;W[dp];B[bs]))(;W[bs];B[br](;W[cs];B[dp])(;W[dp];B[cs]))(;W[dp];B[cs]))