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| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Forintos vs de Firmian |
| 1-0 | 28 | 1978 | 2nd Lloyds Bank Masters Open | E38 Nimzo-Indian, Classical, 4...c5 |
| 2. L Karlsson vs de Firmian |
| ½-½ | 12 | 1981 | Nis | E38 Nimzo-Indian, Classical, 4...c5 |
| 3. Hort vs de Firmian |
 | 1-0 | 58 | 1990 | Biel | E38 Nimzo-Indian, Classical, 4...c5 |
| 4. Ivanchuk vs de Firmian |
 | 1-0 | 39 | 1990 | Manila Interzonal | E38 Nimzo-Indian, Classical, 4...c5 |
| 5. Miles vs de Firmian |
| 0-1 | 37 | 1990 | Manila Interzonal | E38 Nimzo-Indian, Classical, 4...c5 |
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Kibitzing
