| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. Factor vs I A Horowitz |
 | 1-0 | 26 |
1928 |
Bradley Beach (USA) | A50 Queen's Pawn Game |
| 27. Factor vs Gilg |
 | 1-0 | 25 |
1928 |
Olympiad | D68 Queen's Gambit Declined, Orthodox Defense, Classical |
| 28. W Schelfhout vs Factor |
| ½-½ | 39 |
1928 |
Olympiad | A46 Queen's Pawn Game |
| 29. T Regedzinski vs Factor |
| 1-0 | 23 |
1928 |
Olympiad | A13 English |
| 30. Dake vs Factor |
| 1-0 | 58 |
1932 |
Pasadena, CA USA | A13 English |
| 31. Factor vs Kashdan |
| 0-1 | 33 |
1932 |
Pasadena | D46 Queen's Gambit Declined Semi-Slav |
| 32. Fine vs Factor |
| 1-0 | 54 |
1932 |
Minnepolis | E00 Queen's Pawn Game |
| 33. Factor vs H Borochow |
| 1-0 | 51 |
1932 |
Pasadena | E11 Bogo-Indian Defense |
| 34. Factor vs Alekhine |
 | ½-½ | 48 |
1932 |
Pasadena (06) | B02 Alekhine's Defense |
| 35. Kupchik vs Factor |
| 1-0 | 77 |
1936 |
USA ch | E91 King's Indian |
| 36. Factor vs Dake |
| 0-1 | 49 |
1936 |
USA ch | B84 Sicilian, Scheveningen |
| 37. I A Horowitz vs Factor |
| 1-0 | 69 |
1936 |
USA ch | C42 Petrov Defense |
| 38. Factor vs Kevitz |
| 1-0 | 46 |
1936 |
USA ch | E60 King's Indian Defense |
| 39. Reshevsky vs Factor |
| 1-0 | 46 |
1936 |
USA ch | D95 Grunfeld |
| 40. Factor vs S Bernstein |
| 0-1 | 52 |
1936 |
USA ch | E34 Nimzo-Indian, Classical, Noa Variation |
| 41. W Adams vs Factor |
| 0-1 | 30 |
1936 |
USA ch | C15 French, Winawer |
| 42. Factor vs Fine |
| ½-½ | 32 |
1936 |
New York USA ch, USA | B90 Sicilian, Najdorf |
| 43. Factor vs Kashdan |
| 0-1 | 66 |
1936 |
USA ch | B29 Sicilian, Nimzovich-Rubinstein |
| 44. A Simonson vs Factor |
 | 0-1 | 60 |
1936 |
USA ch | A27 English, Three Knights System |
| 45. Factor vs G Treysman |
 | 0-1 | 24 |
1936 |
USA ch | D04 Queen's Pawn Game |
| 46. M L Hanauer vs Factor |
| 0-1 | 56 |
1936 |
USA ch | A27 English, Three Knights System |
| 47. Factor vs H Morton |
| ½-½ | 24 |
1936 |
USA ch | D45 Queen's Gambit Declined Semi-Slav |
| 48. H Steiner vs Factor |
 | 0-1 | 40 |
1936 |
USA ch | A48 King's Indian |
| 49. Factor vs Denker |
| ½-½ | 41 |
1936 |
USA ch | D51 Queen's Gambit Declined |
| 50. Factor vs S Gordon |
 | 1-0 | 43 |
1937 |
Illinois Championship | A12 English with b3 |