| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. A H Williams vs E Ermenkov |
| 0-1 | 30 | 1969 | World Junior Championship Final-B | B18 Caro-Kann, Classical |
| 27. K Payrhuber vs A H Williams |
| 0-1 | 25 | 1969 | World Junior Championship Final-B | A07 King's Indian Attack |
| 28. A H Williams vs G Ligterink |
| ½-½ | 20 | 1969 | World Junior Championship Final-B | C92 Ruy Lopez, Closed |
| 29. N Craske vs A H Williams |
| 0-1 | 57 | 1969 | World Junior Championship Final-B | A36 English |
| 30. J Green-Krotki vs A H Williams |
| ½-½ | 20 | 1969 | World Junior Championship Final-B | A00 Uncommon Opening |
| 31. A H Williams vs E Torre |
| 0-1 | 23 | 1969 | World Junior Championship Final-B | B02 Alekhine's Defense |
| 32. K Rogoff vs A H Williams |
 | ½-½ | 106 | 1969 | World Junior Championship Final-B | A56 Benoni Defense |
| 33. A H Williams vs S Bouaziz |
| ½-½ | 19 | 1969 | World Junior Championship Final-B | A07 King's Indian Attack |
| 34. M Corden vs A H Williams |
| 0-1 | 28 | 1970 | Varsity Cambridge-Oxford | B02 Alekhine's Defense |
| 35. A H Williams vs M Macdonald-Ross |
| 1-0 | 54 | 1970 | British Championship | B48 Sicilian, Taimanov Variation |
| 36. R Lemon vs A H Williams |
| 0-1 | 50 | 1970 | British Championship | E24 Nimzo-Indian, Samisch |
| 37. A H Williams vs R Eales |
| ½-½ | 15 | 1970 | British Championship | B13 Caro-Kann, Exchange |
| 38. W Hartston vs A H Williams |
| ½-½ | 17 | 1970 | British Championship | A17 English |
| 39. A H Williams vs G Botterill |
| 0-1 | 41 | 1970 | British Championship | B08 Pirc, Classical |
| 40. D J Sherman vs A H Williams |
| 1-0 | 38 | 1970 | British Championship | E16 Queen's Indian |
| 41. A H Williams vs P H Clarke |
| ½-½ | 21 | 1970 | British Championship | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 42. B Green vs A H Williams |
| 0-1 | 58 | 1970 | British Championship | B02 Alekhine's Defense |
| 43. A H Williams vs J Penrose |
| ½-½ | 19 | 1970 | British Championship | B22 Sicilian, Alapin |
| 44. A H Williams vs D Anderton |
| 1-0 | 40 | 1970 | British Championship | C19 French, Winawer, Advance |
| 45. R G Wade vs A H Williams |
| ½-½ | 24 | 1970 | British Championship | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 46. A H Williams vs Keene |
| 0-1 | 27 | 1970 | Cuppers Final | A53 Old Indian |
| 47. Keene vs A H Williams |
| 1-0 | 36 | 1970 | Cambridge University College Championship | D76 Neo-Grunfeld, 6.cd Nxd5, 7.O-O Nb6 |
| 48. B Cafferty vs A H Williams |
| ½-½ | 31 | 1971 | Cambridge B | A28 English |
| 49. R Eales vs A H Williams |
| ½-½ | 22 | 1971 | Cambridge B | B89 Sicilian |
| 50. A H Williams vs R Bellin |
| 1-0 | 39 | 1971 | Cambridge B | A96 Dutch, Classical Variation |
Kibitzing
