| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. Bisguier vs Feuerstein |
| 1-0 | 40 | 1957 | US Championship 1957/58 | E70 King's Indian |
| 27. Feuerstein vs Berliner |
| 1-0 | 45 | 1957 | US Championship 1957/58 | E94 King's Indian, Orthodox |
| 28. J Sherwin vs Feuerstein |
 | 0-1 | 57 | 1957 | US Championship 1957/58 | B41 Sicilian, Kan |
| 29. Feuerstein vs G Kramer |
| ½-½ | 37 | 1957 | US Championship 1957/58 | A07 King's Indian Attack |
| 30. Feuerstein vs Gipslis |
| 0-1 | 53 | 1958 | World U26 Championship | A02 Bird's Opening |
| 31. Mednis vs Feuerstein |
| ½-½ | 40 | 1958 | US Championship 1957/58 | A15 English |
| 32. Feuerstein vs Lombardy |
| ½-½ | 32 | 1958 | US Championship 1957/58 | A15 English |
| 33. A Di Camillo vs Feuerstein |
| ½-½ | 36 | 1958 | US Championship 1957/58 | A49 King's Indian, Fianchetto without c4 |
| 34. Feuerstein vs Denker |
| 1-0 | 45 | 1958 | US Championship 1957/58 | E46 Nimzo-Indian |
| 35. Vukcevich vs Feuerstein |
| ½-½ | 62 | 1958 | WchT U26 fin-A 05th | B01 Scandinavian |
| 36. Tringov vs Feuerstein |
| 1-0 | 56 | 1958 | WchT U26 fin-A 05th | B00 Uncommon King's Pawn Opening |
| 37. Robert D Grande vs Feuerstein |
| 0-1 | 35 | 1960 | Thomas Emery Armed Forces Ch | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 38. Feuerstein vs R H Steinmeyer |
| ½-½ | 60 | 1963 | Manhattan Chess Club Championship | A15 English |
| 39. Feuerstein vs F Smrcka |
| 0-1 | 24 | 1965 | 5.corr ol | E83 King's Indian, Samisch |
| 40. M Boysan vs Feuerstein |
| ½-½ | 53 | 1965 | 5.corr ol | B43 Sicilian, Kan, 5.Nc3 |
| 41. C Hunter vs Feuerstein |
| 1-0 | 28 | 1965 | 5.corr ol | B42 Sicilian, Kan |
| 42. Feuerstein vs Olle Smith |
| 1-0 | 51 | 1965 | 5.corr ol | E46 Nimzo-Indian |
| 43. Feuerstein vs B Koch |
| ½-½ | 56 | 1965 | 5.corr ol | A60 Benoni Defense |
| 44. H R Engel vs Feuerstein |
| 1-0 | 37 | 1965 | 5.corr ol | A79 Benoni, Classical, 11.f3 |
| 45. Fischer vs Feuerstein |
| 1-0 | 34 | 1971 | Manhattan blitz | A07 King's Indian Attack |
| 46. Feuerstein vs Larry Evans |
| 0-1 | 33 | 1972 | US Championship | A49 King's Indian, Fianchetto without c4 |
| 47. Lombardy vs Feuerstein |
| 1-0 | 36 | 1972 | US Championship | B90 Sicilian, Najdorf |
| 48. Feuerstein vs I A Horowitz |
| 1-0 | 25 | 1972 | US Championship | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 49. Popovych vs Feuerstein |
| ½-½ | 24 | 1972 | US Championship | B43 Sicilian, Kan, 5.Nc3 |
| 50. Feuerstein vs Kavalek |
| ½-½ | 40 | 1972 | US Championship | A67 Benoni, Taimanov Variation |
Kibitzing
