26th Open Tournament, by OPAX-Mindgames
13 players participated in this 6-round tournament, held from 07 Nov 2025 to 19 Dec 2025 in Athens, Greece. Top 10 Elo average was 1410, and top seed was Stylianos Giannopoulos (🇬🇷 GRE, 1770).
Ioannis Sgouros Niarchos (🇬🇷 GRE, 1547) won with 5.0/6, ahead of Stylianos Giannopoulos (5.0) and Vasilios N Oikonomou (3.5). Sgouros Niarchos shared the lead from round 1, winning on tie-break.
The biggest upset came in round 1: Konstantinos Megagiannis (1464) beat Dimitrios Th Theodoropoulos (1698), a +234-point gap.
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How it unfolded
Top 6 · 6 roundsTight race until R6; 2 players tied at 5.0/6, decided on Buchholz.
2 players finish on 5.0/6. Sgouros Niarchos takes the title on Buchholz Cut1 (17.0).
Stylianos Giannopoulos lost to Ioannis Sgouros Niarchos (Black).
Stylianos Giannopoulos 4 wins (R3–R6)Ioannis Sgouros Niarchos 3 wins (R1–R3)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Stylianos Giannopoulos | * | 0 | 1 | — |
| 2Ioannis Sgouros Niarchos | 1 | * | ½ | 1 |
| 3Vasilios N Oikonomou | 0 | ½ | * | — |
| 4Alexandros Rentzos | — | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Sgouros Niarchos, Ioannis | 1547 | GRE | +12N | +2B | +5N | =6B | +4N | =3B | 5.0 | 17.0 | 17.5 | 14.50 | 1853 | +38.4 |
| 2 | Giannopoulos, Stylianos | 1770 | GRE | +11B | −1N | +7N | +3B | +6N | +4B | 5.0 | 16.5 | 17.5 | 12.50 | 1785 | +2.2 |
| 3 | Oikonomou, Vasilios N | 1466 | GRE | F | +8N | +9B | −2N | +10B | =1N | 3.5 | 16.0 | 16.0 | 8.50 | 1673 | +21.0 |
| 4 | Theodoropoulos, Dimitrios Th | 1698 | GRE | −10N | +12B | +11N | +8B | −1B | −2N | 3.0 | 15.0 | 15.5 | 4.00 | 1374 | -66.8 |
| 5 | Rentzos, Alexandros | 1607 | GRE | +7B | =10N | −1B | +11N | =9N | −6B | 3.0 | 13.5 | 14.5 | 5.25 | 1439 | -46.0 |
| 6 | Oikonomou, Nikolaos NA | 1525 | GRE | F | F | +10B | =1N | −2B | +5N | 2.5 | 14.5 | 14.5 | 7.00 | 1691 | +17.2 |
| 7 | Papaioannou, Konstantinos I | 0 | GRE | −5N | F | −2B | =12N | +11B | +10N | 2.5 | 11.0 | 11.0 | 2.75 | 1582 | 0.0 |
| 8 | Karydis, Filippos | 0 | GRE | =9N | −3B | +13B | −4N | +12B | F | 2.5 | 9.0 | 9.0 | 1.50 | 1293 | 0.0 |
| 9 | Liatsis, Theodoros | 1534 | GRE | =8B | +13N | −3N | F | =5B | F | 2.0 | 9.5 | 9.5 | 2.75 | 1343 | -9.8 |
| 10 | Megagiannis, Konstantinos | 1464 | GRE | +4B | =5B | −6N | F | −3N | −7B | 1.5 | 14.5 | 14.5 | 4.50 | 1487 | +4.0 |
| 11 | Vassalos, Panagiotis | 1489 | GRE | −2N | F | −4B | −5B | −7N | +13N | 1.0 | 13.5 | 13.5 | 0.00 | 892 | -14.6 |
| 12 | Stavridis, Grigoris | 0 | GRE | −1B | −4N | F | =7B | −8N | F | 0.5 | 15.0 | 15.0 | 1.25 | 823 | 0.0 |
| 13 | Kalonomos, Konstantinos | 0 | GRE | F | −9B | −8N | F | F | −11B | 0.0 | 5.5 | 5.5 | 0.00 | 712 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Sgouros Niarchos, IoannisGRE+38.45.0 pts · #2
- 2Oikonomou, Vasilios NGRE+21.03.5 pts · #4
- 3Oikonomou, Nikolaos NAGRE+17.22.5 pts · #3
- 1Theodoropoulos, Dimitrios ThGRE-66.83.0 pts · #8
- 2Rentzos, AlexandrosGRE-46.03.0 pts · #5
- 3Vassalos, PanagiotisGRE-14.61.0 pts · #11
- R1+234 Elo gap
- R2+223 Elo gap
- R5+151 Elo gap