(;AW[js]AW[ks]AW[kr]AW[kq]AB[jr]AB[jq]AB[jp]AB[kp]AW[lp]AW[mp]AW[np]AW[op]AB[lq]AB[lr]AB[mq]AB[nq]AB[oq]AB[or]AB[ns]AB[pr]AW[pq]AW[qr]AW[pp]AW[rq]AW[ir]AW[iq]AW[ip]AB[lo]AB[kn]AB[jn]C[Can White kill the black group?FORCE]LB[nn:Yes]LB[pn:No]AP[goproblems] (;W[pn]C[]AB[ir]AB[iq]AB[ip]AW[jr]AW[jq]AW[jp]AW[kp]AB[kq]AB[kr]AB[ks]AB[js]AW[lq]AW[lr]AW[mq]AW[nq]AW[oq]AW[or]AW[pr]AW[ns]AB[lp]AB[mp]AB[np]AB[op]AB[pp]AB[pq]AB[qr]AB[rq]AW[lo]AW[jn]AW[kn];B[ps]C[Okay, now the colors of the stones are swithed. Please proof why the white group can't be killed] (;W[ls] (;B[mr];W[is]C[RIGHT]) (;B[is];W[mr]C[RIGHT])) (;W[mr];B[ls])) (;W[nn];B[on]C[Okay, please kill the black group.];W[ps];B[ls] (;W[is];B[mr]) (;W[mr];B[is])))