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| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Leonhardt vs Tarrasch |
| 1-0 | 44 |
1905 |
Ostend | B23 Sicilian, Closed |
| 2. Leonhardt vs Schlechter |
| ½-½ | 30 |
1905 |
Ostend | B43 Sicilian, Kan, 5.Nc3 |
| 3. Leonhardt vs O Bernstein |
| 1-0 | 56 |
1905 |
Barmen Masters A, GER | B25 Sicilian, Closed |
| 4. Leonhardt vs B Leussen |
| 1-0 | 32 |
1905 |
Scheveningen | B24 Sicilian, Closed |
| 5. Leonhardt vs Janowski |
| 1-0 | 21 |
1906 |
Ostend | B45 Sicilian, Taimanov |
| 6. Leonhardt vs Tartakower |
 | 1-0 | 41 |
1907 |
Carlsbad it, CZE | B21 Sicilian, 2.f4 and 2.d4 |
| 7. Leonhardt vs Mieses |
| 0-1 | 50 |
1907 |
Ostende-B | B40 Sicilian |
| 8. Leonhardt vs C Jaffe |
| 0-1 | 62 |
1911 |
Karlsbad | B40 Sicilian |
| 9. Leonhardt vs Tarrasch |
| ½-½ | 49 |
1911 |
San Sebastian | B45 Sicilian, Taimanov |
| 10. Leonhardt vs Tarrasch |
| 0-1 | 46 |
1912 |
San Sebastian | B43 Sicilian, Kan, 5.Nc3 |
| 11. Leonhardt vs Reti |
 | 1-0 | 65 |
1920 |
Berlin | B34 Sicilian, Accelerated Fianchetto |
| 12. Leonhardt vs Gilg |
| 1-0 | 28 |
1926 |
DSV Kongress | B44 Sicilian |
| 13. Leonhardt vs Hilse |
| ½-½ | 46 |
1927 |
25. DSB Kongress | B85 Sicilian, Scheveningen, Classical |
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Secrets of Opening Surprises
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