(;AP[goproblems]AB[rr]AB[rs]AB[pr]AB[qq]AB[pp]AB[op]AB[oq]AB[qp]AB[or]AW[rq]AW[rp]AW[sr]AW[qo]AW[po]AW[oo]AW[no]AW[np]AW[nq]AW[nr]AW[ns]AW[qr]C[White to kill](;W[ps]LB[os:A];B[qs](;W[os]C[RIGHT])(;W[sq];B[os])(;W[ro];B[os])(;W[so];B[os])(;W[ss];B[sq]))(;W[qs];B[ps])(;W[os];B[ps])(;W[sq];B[os])(;W[ro];B[os])(;W[so];B[os])(;W[sp];B[os]))