Najdorf Shainswit vs Najdorf, 1951 (D46) Queen's Gambit Declined Semi-Slav, 42 moves, 0-1 from merano 1924 Gruenfeld vs Rubinstein, 1924  (D48) Queen's Gambit Declined Semi-Slav, Meran, 36 moves, 0-1 Spielmann vs Gruenfeld, 1924  (D48) Queen's Gambit Declined Semi-Slav, Meran, 44 moves, 0-1 Topalov vs Ivanchuk, 1997  (D45) Queen's Gambit Declined Semi-Slav, 43 moves, 0-1 4 games