| 9 ago 2026 | Koustav Chatterjee 2484 | Isanzhulov, Arystan 2385 | 0-1 | E52 Defensa Nimzoindia: Normal Variation, Schlechter Defense | Finals | Tiebreaks: Koustav Chatterjee - Isanzhulov, Arystan | 32 | Ver |
| 9 ago 2026 | Koustav Chatterjee 2484 | Isanzhulov, Arystan 2385 | 0-1 | E47 Defensa Nimzoindia: Normal Variation | Finals | Game 2: Koustav Chatterjee - Isanzhulov, Arystan | 47 | Ver |
| 9 ago 2026 | Kamalidenova, Meruert 2400 | Koustav Chatterjee 2484 | 0-1 | C52 Apertura Italiana: Evans Gambit, Leonhardt Countergambit | Finals | Game 1: Kamalidenova, Meruert - Koustav Chatterjee | 55 | Ver |
| 8 ago 2026 | Gazik, Viktor 2549 | Koustav Chatterjee 2484 | ½-½ | C64 Apertura Española (Ruy López): Classical Variation | Semifinals | Game 2: Gazik, Viktor - Koustav Chatterjee | 23 | Ver |
| 8 ago 2026 | Koustav Chatterjee 2484 | Kacharava, Nikolozi 2521 | 0-1 | E05 Apertura Catalana: Open Defense, Classical Line | Semifinals | Game 1: Koustav Chatterjee - Kacharava, Nikolozi | 49 | Ver |
| 7 ago 2026 | Koustav Chatterjee 2484 | Mariano, Fabian Glen 2312 | ½-½ | D80 Defensa Grünfeld: Stockholm Variation | Quarterfinals | Game 2: Koustav Chatterjee - Mariano, Fabian Glen | 26 | Ver |
| 7 ago 2026 | Ulhaq, Zacky Dhia 2338 | Koustav Chatterjee 2484 | ½-½ | D38 Gambito de Dama rehusado: Ragozin Defense | Quarterfinals | Game 1: Ulhaq, Zacky Dhia - Koustav Chatterjee | 41 | Ver |
| 6 ago 2026 | Alimbetov, Dias 2149 | Koustav Chatterjee 2484 | 0-1 | D38 Gambito de Dama rehusado: Ragozin Defense | Round 3 | Game 1: Alimbetov, Dias - Koustav Chatterjee | 40 | Ver |
| 5 ago 2026 | Koustav Chatterjee 2484 | Tsarsitalidis, Konstantinos 2275 | 1-0 | D30 Defensa Semieslava: Quiet Variation | Round 2 | Game 2: Koustav Chatterjee - Tsarsitalidis, Konstantinos | 60 | Ver |
| 5 ago 2026 | Tsarsitalidis, Konstantinos 2275 | Koustav Chatterjee 2484 | 0-1 | C46 Apertura de los Tres Caballos: Schlechter Variation | Round 2 | Game 1: Tsarsitalidis, Konstantinos - Koustav Chatterjee | 49 | Ver |
| 16 may 2026 | Koustav Chatterjee 2484 | Young, Cohen 2070 | 1-0 | A15 Apertura Inglesa: Anglo-Indian Defense, King's Knight Variation | rated rapid game | 24 | Ver |
| 16 may 2026 | Young, Cohen 2070 | Koustav Chatterjee 2484 | 0-1 | C88 Apertura Española (Ruy López): Closed, Anti-Marshall | rated rapid game | 40 | Ver |
| 2 may 2026 | Kacharava, Nikolozi 2528 | Koustav Chatterjee 2484 | 1-0 | C88 Apertura Española (Ruy López): Closed, Anti-Marshall | rated rapid game | 62 | Ver |
| 2 may 2026 | Koustav Chatterjee 2484 | Rodrigue-Lemieux, Shawn 2533 | ½-½ | E60 Defensa India de Rey: Normal Variation, King's Knight Variation | rated rapid game | 53 | Ver |
| 2 may 2026 | Sargsyan, Anna M. 2360 | Koustav Chatterjee 2484 | 0-1 | C50 Apertura Italiana: Giuoco Pianissimo, Normal | rated rapid game | 33 | Ver |
| 2 may 2026 | Koustav Chatterjee 2484 | Orrego Palermo, Marcelo 2082 | 1-0 | A06 Apertura Zukertort | rated rapid game | 66 | Ver |
| 19 ene 2026 | Schitco, Ivan 2490 | Koustav Chatterjee 2488 | ½-½ | C88 Apertura Española (Ruy López): Closed | 2026 NY Marshall Winter Invitational | GM B | 29 | Ver |
| 19 ene 2026 | Koustav Chatterjee 2488 | Ludwig, John 2344 | ½-½ | A07 Ataque Indio de Rey: Keres Variation | 2026 NY Marshall Winter Invitational | GM B | 32 | Ver |
| 18 ene 2026 | Fus, Jakub 2422 | Koustav Chatterjee 2488 | ½-½ | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | 2026 NY Marshall Winter Invitational | GM B | 24 | Ver |
| 18 ene 2026 | Koustav Chatterjee 2488 | Hebbar, Eshaan 2233 | ½-½ | E97 Defensa India de Rey: Orthodox Variation, Bayonet Attack | 2026 NY Marshall Winter Invitational | GM B | 53 | Ver |