[Event "St Petersburg International Preliminary"] [Site "St Petersburg"] [Date "1914.04.21"] [Round "1"] [White "Gunsberg, Isidor"] [Black "Alekhine, Alexander"] [Result "0-1"] [ECO "C53"] [Annotator "Tactical Analysis 4.1 (180s)"] [PlyCount "60"] [EventDate "1914.04.21"] [EventType "tourn"] [EventRounds "11"] [EventCountry "RUS"] [SourceTitle "Tournaments"] [Source "ChessBase"] [SourceDate "2004.03.11"] [SourceVersion "1"] [SourceVersionDate "2004.03.11"] [SourceQuality "1"] {[%evp 13,60,89,87,0,0,-89,-87,-95,-91,-107,-105,-77,-75,-275,-263,-268,-262, -253,-262,-293,-297,-335,-312,-391,-331,-622,-626,-632,-610,-623,-606,-782, -787,-932,-925,-873,-861,-994,-984,-1109,-1105,-2450,-2434,-6444,-7280,-3417, -3155,-29983,-29984]} {Análisis de Fat Fritz 2.0.} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. O-O d6 6. d4 Bb6 7. a4 a6 8. a5 {C53: Giuoco Piano sidelines.} (8. Re1 $16) 8... Nxa5 $146 ({Predecessor:} 8... Ba7 9. b4 Nf6 10. b5 axb5 11. Bxb5 O-O 12. Bxc6 bxc6 13. dxe5 Nxe4 14. Nd4 dxe5 15. Nxc6 Bxf2+ 16. Kh1 Qh4 17. g3 Nxg3+ 18. Kg2 Bh3+ 19. Kxf2 Nxf1+ 20. Kg1 Qe4 21. Ne7+ Kh8 22. Qd5 Qe1 { 0-1 (22) Mortimer,J-Cohn,E Ostend 1907}) 9. Rxa5 Bxa5 $17 10. Qa4+ {Black is better.} b5 {[%mdl 64] Double Attack} 11. Qxa5 {Black must now prevent Bxb5+!} bxc4 12. dxe5 dxe5 13. b3 $2 {[#]} (13. Na3 $17 {was worth a try.}) 13... f6 $1 $19 ({Not} 13... cxb3 14. Ba3 $15) 14. Rd1 Be6 ({Don't play} 14... cxb3 15. Ba3 $17) 15. Ba3 {[#]} Rd8 $1 {[%mdl 512]} 16. Nbd2 (16. Rd5 Qf7) 16... Qd7 17. Re1 Ne7 18. Qb4 a5 19. Qc5 (19. Qxa5 cxb3 20. Nxb3) 19... cxb3 20. Nf1 {intending Rd1!} Qd6 21. Qxa5 Qb6 22. Qa4+ Kf7 23. Bxe7 Kxe7 24. Qa3+ c5 25. c4 Ra8 26. Qc1 b2 27. Qc2 Ra1 28. N1d2 Rxe1+ 29. Nxe1 Rd8 {( -> ...Rxd2!)} 30. Nd3 Qd6 { White did not feel at home in the position after the opening. Weighted Error Value: White=0.86/Black=0.04} 0-1