| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. A Lein vs Antoshin |
| ½-½ | 43 |
1955 |
URS-ch sf | E52 Nimzo-Indian, 4.e3, Main line with ...b6 |
| 2. A Lein vs J Kozma |
| 1-0 | 46 |
1965 |
DSV-Turnier 02nd | E46 Nimzo-Indian |
| 3. A Lein vs Platonov |
| 1-0 | 45 |
1968 |
Ch URS | E49 Nimzo-Indian, 4.e3, Botvinnik System |
| 4. A Lein vs Tseshkovsky |
| 1-0 | 38 |
1968 |
Ch URS, Alma-Ata | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 5. A Lein vs Browne |
| 1-0 | 66 |
1982 |
It ( cat. 12 ) | E41 Nimzo-Indian |
| 6. A Lein vs Christiansen |
| ½-½ | 41 |
1983 |
Ch USA | E41 Nimzo-Indian |
| 7. A Lein vs DeFirmian |
| ½-½ | 50 |
1986 |
USA-ch | E43 Nimzo-Indian, Fischer Variation |
| 8. A Lein vs Suba |
| ½-½ | 45 |
1987 |
New York op | E32 Nimzo-Indian, Classical |
| 9. A Lein vs Gipslis |
| ½-½ | 18 |
1988 |
Saint John | E38 Nimzo-Indian, Classical, 4...c5 |
| 10. A Lein vs Suba |
| 0-1 | 39 |
1988 |
New York op | E46 Nimzo-Indian |
| 11. A Lein vs Dzindzichashvili |
| 0-1 | 41 |
1989 |
It (matches) | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 12. A Lein vs A Rea |
| 1-0 | 53 |
1999 |
U.S. Open | E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3 |
| 13. A Lein vs Browne |
| ½-½ | 10 |
2003 |
US Championships 2003 | E41 Nimzo-Indian |
| 14. A Lein vs I Ibragimov |
| 0-1 | 52 |
2004 |
Chessmaster US Championships 2005 | E32 Nimzo-Indian, Classical |