| 21 jun 2026 | Bartczak, Korneliusz 2130 | Kostic, Milutin B 2064 | ½-½ | B17 Defensa Caro-Kann: Karpov Variation, Modern Main Line | 38th International Chess Tournament Open Pula 2026 | 33 | Ver |
| 3 jun 2026 | Larkin, Vladyslav 2500 | Kostic, Milutin B 2064 | 1-0 | B17 Defensa Caro-Kann: Karpov Variation, Modern Main Line | 38th International Chess Tournament Open Pula 2026 | 41 | Ver |
| 24 may 2026 | Kopasz, Robert 2257 | Kostic, Milutin B 2042 | 0-1 | B17 Defensa Caro-Kann: Karpov Variation | 12th Serbian Cup \"Svetozar Gligorić\" | Open | 35 | Ver |
| 13 may 2026 | Radisavljevic, Dalibor 2265 | Kostic, Milutin B 2042 | 1-0 | B12 Defensa Caro-Kann: Advance Variation, Tal Variation | Serbian Individual Championship | Semifinals | Open | 51 | Ver |
| 12 may 2026 | Radovic, Luka 2280 | Kostic, Milutin B 2042 | 1-0 | A11 Apertura Réti: Anglo-Slav Variation, with g3 | Serbian Individual Championship | Semifinals | Open | 50 | Ver |
| 10 may 2026 | Kostic, Milutin B 2042 | Jocev, Milan 2255 | ½-½ | D14 Defensa Eslava: Exchange Variation, Symmetrical Line | NIKOLA KARAKLAJIĆ CUP 2026 | 16 | Ver |
| 27 mar 2026 | Kostic, Milutin B 2041 | Rihterovic, Milan 2053 | ½-½ | E68 Defensa India de Rey: Fianchetto Variation, Classical Variation | PRVENSTVO SRBIJE ZA VETERANE 2026 65+ | 21 | Ver |
| 27 mar 2026 | Rajkovic, Dusan 2233 | Kostic, Milutin B 2041 | ½-½ | A12 Apertura Réti: Anglo-Slav Variation, Capablanca Variation | PRVENSTVO SRBIJE ZA VETERANE 2026 65+ | 24 | Ver |
| 24 mar 2026 | Kostic, Milutin B 2041 | Todorovic, Goran N 2265 | ½-½ | A47 Pseudo Queen's Indian Defense | PRVENSTVO SRBIJE ZA VETERANE 2026 65+ | 25 | Ver |