(;AB[cr]AB[dr]AB[br]AW[ar]AW[aq]AW[bq]AW[cq]AW[dq]AW[eq]AW[fq]AW[gq]AW[hq]AB[hr]AB[ir]AB[iq]AB[ip]AB[io]AW[hp]AW[ho]LB[br:S]LB[cr:O]LB[dr:S]C[Linking the black groups^^]AB[ko]AP[goproblems]
(;B[fr];W[er];B[es];W[gr];B[gs];W[fs]C[Ko is not good enough])
(;B[er];W[fr];B[fs];W[gs])
(;B[fs];W[gs];B[gr];W[es];B[fr];W[er])
(;B[gs];W[fs];B[fr];W[er];B[es]C[RIGHT])
(;B[es];W[fs];B[fr];W[gr];B[gs]C[];W[er];B[fs];W[ds];B[cs];W[bs];B[as]C[This would be a problem but just focus on the technique.RIGHT]))