[Event "It"] [Site "masterchessopen.com San Remo (Italy)"] [Round "0"] [White "Bogoljubow Efim D (UKR)"] [Black "Nimzowitsch Aaron"] [Result "0-1"] [ECO "E22"] [Opening "Nimzo-Indian: Spielmann, 4...c5"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5 8.Qc2 f5 9.e3 O-O 10.Be2 b6 11.O-O-O a5 { ! } 12.a3 a4 { !! } 13.Nb5 ( 13.axb4 Nxb4 14.Qb1 Nb3# ) 13...Bxd2+ 14.Nxd2 Na5 15.Bf3 d5 { ! } 16.cxd5 Ba6 { ! } 17.Nc4 ( 17.Nc3 Bd3 { ??+ } ) ( 17.Nd4 Rc8 18.Nc6 Bd3 19.Nxd8 Ncb3+ { ??+ } ) 17...Bxb5 18.dxe6 Qc7 ( 18...Bxc4 19.Rxd8 Raxd8 20.Rd1 ( 20.e7 Nab3+ { ? } ) ( 20.Be2 Nab3+ 21.Kb1 Nd2+ 22.Ka1 Ncb3+ 23.Ka2 Nc1+ 24.Ka1 Ndb3+ 25.Kb1 Bxe2 { ??+ } ) 20...Bxe6 ( 20...Rxd1+ 21.Qxd1 Bxe6 22.Kb1 Rc8 23.Qd6 Kh8 { ! } 24.Bd5 Ncb3 25.Ka2 Bg8 { ! } 26.Bxg8 Rc1 27.Bxb3 axb3# ) 21.Rxd8 { ? } ) ( 18...Nxc4 19.Rxd8 Raxd8 20.e7 Nb3+ 21.Kb1 Ncd2+ 22.Ka2 Bc4 { ? } ) 19.Bxa8 Bxc4 20.Bd5 Bxd5 21.Rxd5 Qc6 { ! } 22.e7 ( { ? } 22.Rhd1 ) 22...Qxd5 23.exf8=Q+ Kxf8 24.Rd1 Qe5 { ! } 25.h3 h5 26.g4 ( 26.Kb1 h4 27.Rd4 Nab3 28.Rxh4 Qd5 { ? } ) ( 26.h4 { ! ? } ) 26...hxg4 27.hxg4 Nab3+ { ! } ( 27...fxg4 { ?! } 28.Qg6 Nab3+ 29.Kc2 { ! } 29...Qe4+ 30.Qxe4 Nxe4 31.Rg1 Nxf2 32.Rg2 { = } ) 28.Kb1 fxg4 29.Rg1 ( 29.Qg6 Qe4+ 30.Qxe4 Nxe4 { ? } ) 29...Qd5 30.Rd1 Qe4 31.Rg1 Nd2+ 32.Kc1 Qd5 33.Qh7 ( 33.b4 Ncb3+ 34.Kb2 Nc4+ 35.Ka2 Nd4 36.Qxa4 b5 { ! } 37.Qa7 Na5+ 38.Ka1 Ndb3+ 39.Kb1 Qd3+ 40.Kb2 Nc4+ 41.Ka2 Qc2# ) 33...Nde4 34.Qh8+ Kf7 35.Kb1 Qd3+ 0-1