[Event "Tournament"] [Site "masterchessopen.com Deventer (Netherlands)"] [Round "5"] [White "Riefel J"] [Black "Valkenburg M"] [Result "1-0"] [ECO "E38"] [Opening "Nimzo-Indian: Classical, 4...c5"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Bxc5 6.Nf3 h6 7.Bf4 Nc6 8.Rd1 a6 9.e4 Ng4 10.Bg3 Nf6 11.Bh4 Be7 12.Be2 O-O 13.O-O Re8 14.a3 Nh5 15.Bxe7 Qxe7 16.Rd2 Nf4 17.Bd1 Qf6 18.Ne2 Nh3+ 19.Kh1 Ng5 20.Ng3 Nxf3 21.Bxf3 e5 22.Nf5 Kh7 23.Nd6 Re7 24.c5 Nd4 25.Rxd4 exd4 26.e5+ {#r} 1-0