| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Lechtynsky vs S Semkov |
| ½-½ | 53 | 1987 | Vrnjacka Banja | D45 Queen's Gambit Declined Semi-Slav |
| 27. S Semkov vs Dzindzichashvili |
| 1-0 | 46 | 1988 | Saint John op-2 | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 28. Gipslis vs S Semkov |
| ½-½ | 33 | 1988 | Saint John op-2 | B40 Sicilian |
| 29. S Semkov vs B Perenyi |
| 0-1 | 59 | 1988 | Saint John op-1 | A68 Benoni, Four Pawns Attack |
| 30. Lputian vs S Semkov |
| 1-0 | 42 | 1988 | Saint John op-2 | D21 Queen's Gambit Accepted |
| 31. S Semkov vs Geller |
| 1-0 | 53 | 1988 | cat. 10 | D31 Queen's Gambit Declined |
| 32. J Gabriel vs S Semkov |
| 0-1 | 25 | 1988 | Berlin op | A29 English, Four Knights, Kingside Fianchetto |
| 33. Vaganian vs S Semkov |
 | 1-0 | 25 | 1988 | Saint John op-2 | A06 Reti Opening |
| 34. S Semkov vs Romanishin |
| 0-1 | 40 | 1988 | Yerevan | E43 Nimzo-Indian, Fischer Variation |
| 35. S Semkov vs Psakhis |
| 0-1 | 27 | 1988 | Yerevan | E41 Nimzo-Indian |
| 36. Smagin vs S Semkov |
| 1-0 | 31 | 1988 | Yerevan | B40 Sicilian |
| 37. F Braga vs S Semkov |
| 1-0 | 38 | 1988 | Forli Open | B22 Sicilian, Alapin |
| 38. S Semkov vs V Kovacevic |
| 1-0 | 61 | 1988 | Chess Olympiad | A88 Dutch, Leningrad, Main Variation with c6 |
| 39. S Semkov vs Hebden |
| ½-½ | 53 | 1989 | Villeneuve | E76 King's Indian, Four Pawns Attack |
| 40. G Andruet vs S Semkov |
| 0-1 | 40 | 1990 | BUL-FRA | D20 Queen's Gambit Accepted |
| 41. S Semkov vs G Andruet |
 | 1-0 | 24 | 1990 | BUL-FRA | A57 Benko Gambit |
| 42. Smyslov vs S Semkov |
| 1-0 | 34 | 1990 | Rome Open | D20 Queen's Gambit Accepted |
| 43. S Semkov vs Blatny |
| 0-1 | 48 | 1991 | Nimes op | D35 Queen's Gambit Declined |
| 44. Topalov vs S Semkov |
| 1-0 | 41 | 1992 | Bankia | D44 Queen's Gambit Declined Semi-Slav |
| 45. S Semkov vs Suba |
| ½-½ | 70 | 1992 | Sitges op | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 46. L Spassov vs S Semkov |
| 1-0 | 29 | 1992 | Sitges open | A06 Reti Opening |
| 47. G Arias Boo vs S Semkov |
| ½-½ | 54 | 1993 | Sitges op | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 48. Suba vs S Semkov |
| ½-½ | 27 | 1993 | Badalona | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 49. S Semkov vs I Tsvetkov |
| ½-½ | 36 | 2003 | Grigorov mem | D45 Queen's Gambit Declined Semi-Slav |
| 50. N Cheparinov vs S Semkov |
| 0-1 | 32 | 2003 | Grigorov mem | D27 Queen's Gambit Accepted, Classical |
Kibitzing
