Game |
| Result | Moves |
Year | Event/Locale | Opening |
26. H Porth vs H Sonntag |
| 0-1 | 27 | 1988 | Bad Woerishofen Open | D02 Queen's Pawn Game |
27. H Sonntag vs C Garcia Palermo |
| ½-½ | 64 | 1988 | Bad Woerishofen Open | A78 Benoni, Classical with ...Re8 and ...Na6 |
28. N Ristic vs H Sonntag |
| 1-0 | 38 | 1988 | Bad Woerishofen Open | C77 Ruy Lopez |
29. H Sonntag vs A Stummer |
| 1-0 | 41 | 1988 | Bad Woerishofen Open | B17 Caro-Kann, Steinitz Variation |
30. A Brustman vs H Sonntag |
| 0-1 | 44 | 1988 | Bad Woerishofen Open | C92 Ruy Lopez, Closed |
31. H Sonntag vs H Bartels |
| ½-½ | 24 | 1988 | Berlin Open | D55 Queen's Gambit Declined |
32. H Sonntag vs C Ionescu |
| ½-½ | 61 | 1988 | Berlin Open | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
33. I Radulov vs H Sonntag |
| 1-0 | 47 | 1988 | Berlin Open | C45 Scotch Game |
34. G Hertneck vs H Sonntag |
| 1-0 | 50 | 1988 | Berlin Open | D68 Queen's Gambit Declined, Orthodox Defense, Classical |
35. H Sonntag vs R Thormann |
| 0-1 | 28 | 1988 | Berlin Open | A77 Benoni, Classical, 9...Re8, 10.Nd2 |
36. H Sonntag vs U Schulze |
| ½-½ | 20 | 1988 | Badenweiler Open | A56 Benoni Defense |
37. H Sonntag vs C Herbrechtsmeier |
| 1-0 | 51 | 1988 | Badenweiler Open | B42 Sicilian, Kan |
38. M Wiedenkeller vs H Sonntag |
| 1-0 | 46 | 1988 | Badenweiler Open | D67 Queen's Gambit Declined, Orthodox Defense, Bd3 line |
39. H Sonntag vs G Kiefer |
| ½-½ | 11 | 1988 | Badenweiler Open | E46 Nimzo-Indian |
40. U Roemer vs H Sonntag |
| 0-1 | 49 | 1988 | Badenweiler Open | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
41. F Braga vs H Sonntag |
| ½-½ | 6 | 1989 | Bundesliga 1988/89 | D02 Queen's Pawn Game |
42. Hodgson vs H Sonntag |
| 1-0 | 19 | 1989 | Benidorm op | A45 Queen's Pawn Game |
43. Blatny vs H Sonntag |
| 1-0 | 51 | 1989 | Bad Woerishofen op 5th | C84 Ruy Lopez, Closed |
44. H Sonntag vs L Christiansen |
 | 0-1 | 16 | 1989 | Bundesliga 1988/89 | A41 Queen's Pawn Game (with ...d6) |
45. Nunn vs H Sonntag |
| 0-1 | 61 | 1989 | Bundesliga 1988/89 | C92 Ruy Lopez, Closed |
46. F Marchand vs H Sonntag |
| 0-1 | 27 | 1989 | Chanac op | D59 Queen's Gambit Declined, Tartakower |
47. H Sonntag vs M Auer |
 | 1-0 | 9 | 1990 | Porz 23op | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
48. H Sonntag vs G Laurain |
| 1-0 | 25 | 1990 | Toulouse Open | A53 Old Indian |
49. E Birens vs H Sonntag |
| 0-1 | 50 | 1990 | Toulouse Open | E26 Nimzo-Indian, Samisch |
50. H Sonntag vs A Kosten |
| ½-½ | 28 | 1990 | Toulouse Open | E32 Nimzo-Indian, Classical |