| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Lapiken vs A Kaufman |
| 1-0 | 55 | 1954 | 2nd Pan-American Chess Congress | B90 Sicilian, Najdorf |
| 2. P Lapiken vs R Jacobs |
| 1-0 | 51 | 1954 | 2nd Pan-American Chess Congress | B00 Uncommon King's Pawn Opening |
| 3. V Pafnutieff vs P Lapiken |
| ½-½ | 18 | 1954 | 2nd Pan-American Chess Congress | C01 French, Exchange |
| 4. W E Kaiser vs P Lapiken |
| 0-1 | 40 | 1954 | 2nd Pan-American Chess Congress | C86 Ruy Lopez, Worrall Attack |
| 5. P Lapiken vs E McCormick |
| 1-0 | 46 | 1954 | 2nd Pan-American Chess Congress | B01 Scandinavian |
| 6. P Meyer vs P Lapiken |
| 0-1 | 17 | 1954 | 2nd Pan-American Chess Congress | E20 Nimzo-Indian |
| 7. B Madrid vs P Lapiken |
| 0-1 | 22 | 1954 | 2nd Pan-American Chess Congress | E20 Nimzo-Indian |
| 8. P Lapiken vs K Grover |
| 1-0 | 46 | 1954 | 2nd Pan-American Chess Congress | A13 English |
| 9. I Rivise vs P Lapiken |
| 1-0 | 37 | 1954 | 2nd Pan-American Chess Congress | C86 Ruy Lopez, Worrall Attack |
| 10. J Piatigorsky vs P Lapiken |
| 0-1 | 47 | 1955 | 56th US Open | C47 Four Knights |
| 11. P Lapiken vs G E Hartleb |
| 1-0 | 40 | 1955 | 56th US Open | A22 English |
| 12. R J Gross vs P Lapiken |
| 0-1 | 24 | 1955 | 56th US Open | E70 King's Indian |
| 13. P Lapiken vs Reshevsky |
 | ½-½ | 49 | 1955 | 56th US Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 14. I Rivise vs P Lapiken |
| ½-½ | 45 | 1955 | 56th US Open | C86 Ruy Lopez, Worrall Attack |
| 15. P Lapiken vs Rossolimo |
| ½-½ | 49 | 1955 | 56th US Open | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 16. E Hearst vs P Lapiken |
| 0-1 | 37 | 1955 | 56th US Open | A16 English |
| 17. P Lapiken vs J Sherwin |
| 0-1 | 55 | 1955 | 56th US Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 18. I Romanenko vs P Lapiken |
| 1-0 | 49 | 1955 | 56th US Open | C61 Ruy Lopez, Bird's Defense |
| 19. P Lapiken vs C Wallace |
| 0-1 | 55 | 1955 | 56th US Open | C45 Scotch Game |
| 20. Fischer vs P Lapiken |
 | 1-0 | 19 | 1956 | 57th US Open | A04 Reti Opening |
| 21. P Lapiken vs E Van Sweden |
| 1-0 | 27 | 1956 | 57th US Open | C02 French, Advance |
| 22. J A Nowak vs P Lapiken |
| 0-1 | 43 | 1956 | 57th US Open | D09 Queen's Gambit Declined, Albin Counter Gambit, 5.g3 |
| 23. P Lapiken vs I Romanenko |
| 1-0 | 50 | 1956 | 57th US Open | C86 Ruy Lopez, Worrall Attack |
| 24. D Fischheimer vs P Lapiken |
| ½-½ | 44 | 1956 | 57th US Open | B07 Pirc |
| 25. P Lapiken vs E Mednis |
| 0-1 | 40 | 1956 | 57th US Open | E63 King's Indian, Fianchetto, Panno Variation |
Kibitzing
