[Event "It (open)"] [Site "masterchessopen.com Aachen (Germany)"] [Round "4"] [White "Hagenstein F"] [Black "Mueller Michael (GER)"] [Result "1-0"] [BlackElo "2291"] [ECO "E38"] [Opening "Nimzo-Indian: Classical, 4...c5"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O 6.Nf3 Na6 7.g3 Nxc5 8.Bg2 Nfe4 9.O-O Bxc3 10.bxc3 Qa5 11.Ng5 Nxg5 12.Bxg5 f6 13.Bf4 Qa6 14.Rfd1 e5 15.Be3 Ne6 16.c5 Qa5 17.Rd5 Qc7 18.Rad1 Rb8 19.Qa4 b6 20.cxb6 axb6 21.Qb4 b5 22.Bc1 Qc4 23.Qd6 Qc7 24.Ba3 Rf7 25.Qxe6 {#r} 1-0