| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. A Malachi vs M Yeo |
| 1-0 | 44 | 1978 | 2nd Lloyds Bank Masters Open | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 27. R Harman vs M Yeo |
| ½-½ | 54 | 1978 | 2nd Lloyds Bank Masters Open | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 28. M Yeo vs A T Erdal-Smith |
 | 1-0 | 20 | 1979 | London | B06 Robatsch |
| 29. S Hawes vs M Yeo |
| 0-1 | 46 | 1979 | 3rd Lloyds Bank Masters Open | C45 Scotch Game |
| 30. M Yeo vs M A Silva Morales |
| 0-1 | 43 | 1979 | 3rd Lloyds Bank Masters Open | C45 Scotch Game |
| 31. L Kerkhoff vs M Yeo |
| 1-0 | 34 | 1979 | 3rd Lloyds Bank Masters Open | C71 Ruy Lopez |
| 32. M Yeo vs N Davies |
| 0-1 | 39 | 1979 | 3rd Lloyds Bank Masters Open | C45 Scotch Game |
| 33. R Holmes vs M Yeo |
| 1-0 | 49 | 1979 | 3rd Lloyds Bank Masters Open | C53 Giuoco Piano |
| 34. M Yeo vs P K Wells |
| 0-1 | 32 | 1979 | 3rd Lloyds Bank Masters Open | B13 Caro-Kann, Exchange |
| 35. P Heaven vs M Yeo |
| 0-1 | 20 | 1979 | 3rd Lloyds Bank Masters Open | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 36. M Yeo vs S T Banks |
| ½-½ | 23 | 1979 | 3rd Lloyds Bank Masters Open | B96 Sicilian, Najdorf |
| 37. S Byrne vs M Yeo |
| 1-0 | 22 | 1979 | 3rd Lloyds Bank Masters Open | C27 Vienna Game |
| 38. M L Chapman vs M Yeo |
| 0-1 | 36 | 1980 | Benedictine Open | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 39. M Yeo vs L Lederman |
| 0-1 | 33 | 1980 | Benedictine Open | B97 Sicilian, Najdorf |
| 40. I Andreasson vs M Yeo |
| 1-0 | 39 | 1980 | Benedictine Open | D07 Queen's Gambit Declined, Chigorin Defense |
| 41. M Yeo vs A Ludgate |
| ½-½ | 23 | 1980 | Benedictine Open | B09 Pirc, Austrian Attack |
| 42. M Yeo vs I Wells |
| 0-1 | 40 | 1980 | Oxford Open | B80 Sicilian, Scheveningen |
| 43. M Yeo vs S T Banks |
| 1-0 | 15 | 1982 | London League | B96 Sicilian, Najdorf |
| 44. A Kosten vs M Yeo |
| ½-½ | 43 | 1984 | British Championship | C71 Ruy Lopez |
| 45. M Yeo vs C Crouch |
| 1-0 | 66 | 1984 | British Championship | B63 Sicilian, Richter-Rauzer Attack |
| 46. D King vs M Yeo |
| 1-0 | 41 | 1984 | British Championship | D07 Queen's Gambit Declined, Chigorin Defense |
| 47. M Yeo vs J Levitt |
| ½-½ | 38 | 1984 | British Championship | C15 French, Winawer |
| 48. M Yeo vs R Bellin |
| 0-1 | 61 | 1984 | British Championship | B69 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 11.Bxf6 |
| 49. A Dunnington vs M Yeo |
| 0-1 | 46 | 1984 | British Championship | D02 Queen's Pawn Game |
| 50. V Ravikumar vs M Yeo |
| 1-0 | 40 | 1984 | British Championship | D07 Queen's Gambit Declined, Chigorin Defense |
Kibitzing
