[Event "It (c)"] [Site "masterchessopen.com Leiden (Netherlands)"] [Date "1946.10.26"] [Round "1"] [White "Tummers LJ"] [Black "Koomen Willem"] [Result "1-0"] [ECO "D22"] [Opening "QGA: Alekhine, 4.e3"] 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4 5.Bxc4 e6 6.Qb3 Bxf3 7.gxf3 b5 8.Be2 Nd7 9.a4 b4 10.Nd2 c5 11.dxc5 Nxc5 12.Qc2 Nf6 13.b3 Rc8 14.Nc4 Be7 15.Bb2 O-O 16.Rd1 Qc7 17.Be5 Qa7 18.Qb2 Rfd8 19.O-O Ne8 20.Qb1 Bf6 21.Rxd8 Rxd8 22.Rd1 Qe7 23.Rxd8 Qxd8 24.Qd1 Qc8 25.Nb6 Qc6 26.Bxf6 gxf6 27.a5 Nd6 28.Qd4 Nxb3 29.Qg4+ Kh8 30.Qxb4 Nc5 31.Qc3 Kg7 32.Bxa6 Nb5 33.Bxb5 Qxb5 34.Qd2 Nb7 35.Qc3 Qb1+ 36.Kg2 Qb5 37.Nc4 Qc5 38.a6 Nd6 39.a7 {#r} 1-0