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| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G Forintos vs DeFirmian |
| 1-0 | 28 |
1978 |
London (England) | E38 Nimzo-Indian, Classical, 4...c5 |
| 2. K Karlsson vs DeFirmian |
| ½-½ | 12 |
1981 |
Nis (Yugoslavia) | E38 Nimzo-Indian, Classical, 4...c5 |
| 3. Hort vs DeFirmian |
| 1-0 | 58 |
1990 |
It (open) | E38 Nimzo-Indian, Classical, 4...c5 |
| 4. Iwantschuk vs DeFirmian |
| 1-0 | 39 |
1990 |
Manila | E38 Nimzo-Indian, Classical, 4...c5 |
| 5. Miles vs DeFirmian |
 | 0-1 | 37 |
1990 |
Manila (Philippines) | E38 Nimzo-Indian, Classical, 4...c5 |
| 6. Ivanchuk vs DeFirmian |
| 1-0 | 39 |
1990 |
Cup World (select) | E38 Nimzo-Indian, Classical, 4...c5 |
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Secrets of Opening Surprises
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