| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. R Crooks vs F Decoster |
| 0-1 | 32 | 2012 | 35th Taminco Open | B22 Sicilian, Alapin |
| 27. F Decoster vs K Hagendijk |
| 1-0 | 43 | 2012 | 35th Taminco Open | C75 Ruy Lopez, Modern Steinitz Defense |
| 28. J Perrenet vs F Decoster |
| 0-1 | 31 | 2012 | 35th Taminco Open | A00 Uncommon Opening |
| 29. F Decoster vs Y Solodovnichenko |
| 0-1 | 61 | 2012 | 35th Taminco Open | B45 Sicilian, Taimanov |
| 30. F Decoster vs M Maddens |
| ½-½ | 42 | 2012 | 35th Taminco Open | B03 Alekhine's Defense |
| 31. S Bien vs F Decoster |
| 0-1 | 40 | 2012 | 35th Taminco Open | D02 Queen's Pawn Game |
| 32. F Decoster vs V Kurpnieks |
| ½-½ | 58 | 2012 | 35th Taminco Open | B15 Caro-Kann |
| 33. Y Blom vs F Decoster |
| ½-½ | 49 | 2012 | 35th Taminco Open | A13 English |
| 34. F Decoster vs B de Veth |
| ½-½ | 62 | 2012 | 35th Taminco Open | C96 Ruy Lopez, Closed |
| 35. F Decoster vs R Castellanos Rodriguez |
| 0-1 | 50 | 2013 | Cappelle Open | B43 Sicilian, Kan, 5.Nc3 |
| 36. F Decoster vs A Sumets |
 | 0-1 | 29 | 2013 | Cappelle Open | C10 French |
| 37. F Decoster vs J Le Roux |
| 0-1 | 64 | 2013 | Cappelle Open | B09 Pirc, Austrian Attack |
| 38. A Czyz vs F Decoster |
| 0-1 | 41 | 2013 | Cappelle Open | B53 Sicilian |
| 39. A Kobayashi vs F Decoster |
| 0-1 | 87 | 2014 | Cappelle Open | D34 Queen's Gambit Declined, Tarrasch |
| 40. F Decoster vs R Gao |
| 0-1 | 39 | 2014 | Cappelle Open | B90 Sicilian, Najdorf |
| 41. F Decoster vs F Dessenne |
| 1-0 | 49 | 2014 | Cappelle Open | B03 Alekhine's Defense |
| 42. B Kurajica vs F Decoster |
| 1-0 | 20 | 2014 | Cappelle Open | A49 King's Indian, Fianchetto without c4 |
| 43. E Barbosa vs F Decoster |
| 1-0 | 30 | 2014 | Cappelle Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 44. S Ernst vs F Decoster |
| 1-0 | 41 | 2015 | 9th BPB Limburg Open | E60 King's Indian Defense |
| 45. Y Wang vs F Decoster |
| 1-0 | 41 | 2015 | European Club Cup | B27 Sicilian |
| 46. F Decoster vs A Rosenkilde |
| ½-½ | 57 | 2015 | European Club Cup | B94 Sicilian, Najdorf |
| 47. L E Johannessen vs F Decoster |
| ½-½ | 36 | 2015 | European Club Cup | E80 King's Indian, Samisch Variation |
| 48. J Broekmeulen vs F Decoster |
| 1-0 | 30 | 2015 | European Club Cup | A01 Nimzovich-Larsen Attack |
| 49. F Decoster vs J Carstensen |
| ½-½ | 29 | 2015 | European Club Cup | B33 Sicilian |
| 50. F Decoster vs R Bates |
| ½-½ | 47 | 2015 | European Club Cup | B96 Sicilian, Najdorf |
Kibitzing
