[Event "Regionalliga NordN"] [Site "masterchessopen.com – Germany"] [Round "0"] [White "Martin Sommerfeldt L"] [Black "Bohnsack Ralf (GER)"] [Result "1-0"] [BlackElo "2153"] [ECO "A43"] [Opening "Old Benoni: 2.c3"] 1.d4 c5 2.c3 cxd4 3.cxd4 d5 4.Nf3 Nc6 5.Nc3 Nf6 6.Bf4 Bf5 7.e3 e6 8.Be2 Be7 9.O-O O-O 10.Nh4 Bg6 11.Nxg6 hxg6 12.Rc1 Rc8 13.Qa4 Nd7 14.Qb5 Nb6 15.Na4 Nxa4 16.Qxa4 a6 17.Rc3 Qb6 18.Rb1 Bf6 19.Qc2 Be7 20.a3 g5 21.Bg3 f6 22.Rc1 Rcd8 23.Rb3 Qa7 24.Qg6 Qa8 25.Bd3 {#r} 1-0