(;AB[kj]AB[ki]AB[li]AB[jk]AW[kk]AW[kl]AW[km]AB[jl]AB[jm]AW[lj]AW[mk]AW[mi]AW[jn]AW[in]AB[kn]AB[ln]AB[mn]AB[ml]AB[mm]AB[nk]AW[nl]AW[nm]AW[nj]TR[nj]MA[kk]MA[kl]MA[km]C[White just played the triangle move, black to play to kill the 3 white stones.]AP[goproblems] (;B[lk];W[ll]C[CHOICE];B[lm]C[];W[lk];B[mj]C[RIGHT]) (;B[ok];W[lk]C[CHOICE]))