(;GM[1]FF[4]AP[Drago:4.23]SZ[19]CA[UTF-8]C[Diagram 1 - the problem]AB[rr][pr][rp][ro][qn][pn][oo]AW[rn][rm][qm][ol][mn][po][qo][op][pq][mp][mq][mr]
(;B[pp]C[Diagram 2 - the killing move]
(;W[qp];B[qq];W[pp];B[np];W[oq];B[nq];W[or]
;B[nr]C[Diagram 3 - the solution];W[no];B[os];W[nm];B[on];W[nn];B[pm];W[pl];B[ms];W[ls];B[ns]
;W[lr];B[sn];W[sm]
;B[so]C[Diagram 4 - Solution completed])
(;W[oq];B[qq];W[no];B[on];W[om]
(;B[nn];W[nm];B[qp];W[or];B[os];W[ns];B[ps];W[pm];B[sn];W[sm]
;B[so]C[Diagram 6 - White's best response.])
(;B[or]C[Improved completion for Diagram 6];W[nr];B[ns];W[ms];B[os];W[nn];B[qp];W[pm];B[sn];W[sm];B[so])))
(;W[qq];B[rq];W[qr];B[rs];W[so];B[sp]
;W[sr]C[Diagram 5 - White moves first]))
