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| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Factor vs Reti |
 | 1-0 | 33 |
1919 |
Rotterdam | D45 Queen's Gambit Declined Semi-Slav |
| 2. Factor vs H Morton |
| ½-½ | 24 |
1936 |
USA ch | D45 Queen's Gambit Declined Semi-Slav |
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Secrets of Opening Surprises
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