3rd Open SO Petralonon
31 players participated in this 7-round tournament, held from 30 Sept 2025 to 11 Nov 2025 in Petralona, Greece. 2 titled players from 3 federations. Top 10 Elo average was 1990, and top seed was Michail Vassis (🇬🇷 GRE, FM, 2313).
Artiom Antoniadis (🇬🇷 GRE, 1827) won with 5.5/7, ahead of Ioannis Panopoulos (5.0) and Andreas Kofidis (5.0). Antoniadis shared the lead from round 6 and broke clear in the final round.
The biggest upset came in round 3: Ioannis Panopoulos (2001) beat Andreas Kofidis (IM, 2235), a +234-point gap.
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How it unfolded
Top 6 · 7 roundsArtiom Antoniadis led from R7; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R7.
Artiom Antoniadis takes the sole lead (5.5/7).
Artiom Antoniadis drew with IM Andreas Kofidis (Black).
Artiom Antoniadis 4 wins (R3–R6)Ioannis Panopoulos 5 wins (R1–R5)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Artiom Antoniadis | * | ½ | 1 | 0 |
| 2IMAndreas Kofidis | ½ | * | 0 | — |
| 3Ioannis Panopoulos | 0 | 1 | * | 0 |
| 4FMMichail Vassis | 1 | — | 1 | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Antoniadis, Artiom | 1827 | GRE | +28N | −6B | +18N | +11B | +7N | +2B | =3N | 5.5 | 26.0 | 27.0 | 19.50 | 2087 | +43.2 |
| 2 | Panopoulos, Ioannis | 2001 | GRE | +31B | +20N | +3B | +8N | +5B | −1N | −6B | 5.0 | 27.0 | 27.5 | 17.00 | 2130 | +25.4 |
| 3 | Kofidis, AndreasIM | 2235 | GRE | +18N | +21B | −2N | +9B | +13N | =4B | =1B | 5.0 | 26.0 | 28.5 | 18.25 | 2044 | -11.6 |
| 4 | Tsamtsouris, Efthymios | 2028 | GRE | +11N | =13B | −7N | +26B | +9N | =3N | +8B | 5.0 | 24.5 | 26.5 | 17.75 | 1984 | -4.8 |
| 5 | Stratigos, Spiros | 2144 | GRE | +19B | +10N | +16B | −6B | −2N | +17N | +12B | 5.0 | 23.5 | 26.5 | 16.50 | 2021 | -12.0 |
| 6 | Vassis, MichailFM | 2313 | GRE | +12B | +1N | +8B | +5N | F | F | +2N | 5.0 | 23.0 | 23.0 | 23.00 | 2777 | +13.2 |
| 7 | Samartzis, Mihail | 1839 | GRE | +23B | −16N | +4B | +14N | −1B | =12N | +20B | 4.5 | 23.0 | 25.0 | 14.75 | 1929 | +15.4 |
| 8 | Tsalamagkakis, Ilias | 1894 | GRE | +30N | +9B | −6N | −2B | +18N | +11B | −4N | 4.0 | 25.5 | 26.0 | 11.00 | 1886 | +0.4 |
| 9 | dos Ramos, Geryen | 1767 | SUR | +24B | −8N | +22B | −3N | −4B | +25N | +16B | 4.0 | 21.5 | 23.5 | 9.50 | 1690 | -9.2 |
| 10 | Masa, Alexandros | 1804 | GRE | +22N | −5B | F | +25N | +17B | F | +13N | 4.0 | 16.0 | 16.0 | 11.00 | 1980 | +18.2 |
| 11 | Bartzos, Iasonas | 1599 | GRE | −4B | +15N | +20B | −1N | +14B | −8N | =17B | 3.5 | 24.5 | 27.0 | 11.00 | 1763 | +54.8 |
| 12 | Karantoniou, Stylianos | 1682 | GRE | −6N | +28B | +21N | −13B | +15N | =7B | −5N | 3.5 | 24.0 | 25.0 | 9.25 | 1787 | +31.6 |
| 13 | Raptakis, Solon | 1793 | GRE | +25B | =4N | =17B | +12N | −3B | =20N | −10B | 3.5 | 23.0 | 25.0 | 10.75 | 1821 | +1.2 |
| 14 | Kalogeropoulos, Konstantinos | 1686 | GRE | −16N | +29B | +24N | −7B | −11N | +27B | =21N | 3.5 | 16.5 | 17.5 | 5.25 | 1623 | -1.2 |
| 15 | Vamvoukou, Maria Ines | 1446 | GRE | −21N | −11B | =23B | +31N | −12B | +19N | +28B | 3.5 | 15.5 | 16.0 | 5.50 | 1591 | +50.0 |
| 16 | Tarnaris, Ioannis | 0 | GRE | +14B | +7B | −5N | −17N | F | +18B | −9N | 3.0 | 23.0 | 25.5 | 11.00 | 1798 | 0.0 |
| 17 | Kazakos, Panteleimon | 1769 | GRE | F | +26B | =13N | +16B | −10N | −5B | =11N | 3.0 | 21.0 | 21.0 | 8.50 | 1715 | -9.4 |
| 18 | Dristellas, Nikolaos | 1655 | GRE | −3B | +23N | −1B | +27N | −8B | −16N | +30B | 3.0 | 20.5 | 21.0 | 3.50 | 1680 | +0.4 |
| 19 | Lampiris, Nikolaos | 1604 | GRE | −5N | −22B | +30N | −21B | +24N | −15B | +27N | 3.0 | 16.5 | 17.0 | 3.50 | 1400 | -50.0 |
| 20 | Chatzipavlou, Odysseas | 1789 | GRE | +27N | −2B | −11N | +24B | F | =13B | −7N | 2.5 | 21.5 | 22.5 | 4.75 | 1485 | -56.4 |
| 21 | Megagiannis, Maximos | 1816 | GRE | +15B | −3N | −12B | +19N | F | F | =14B | 2.5 | 18.5 | 18.5 | 8.25 | 1709 | -27.4 |
| 22 | Rekatsinas, Spyridon | 1443 | GRE | −10B | +19N | −9N | −29B | =25B | +23N | −24B | 2.5 | 17.0 | 18.0 | 6.00 | 1571 | +27.6 |
| 23 | Kampili, Konstantina | 1474 | GRE | −7N | −18B | =15N | +30B | −26N | −22B | =31N | 2.0 | 16.0 | 16.5 | 2.50 | 1417 | -12.8 |
| 24 | Mantzikos, Christos | 0 | GRE | −9N | F | −14B | −20N | −19B | +31B | +22N | 2.0 | 16.0 | 16.0 | 3.00 | 1497 | 0.0 |
| 25 | Lazos, Vasilios | 0 | GRE | −13N | =30B | +29N | −10B | =22N | −9B | F | 2.0 | 15.5 | 15.5 | 2.50 | 1526 | 0.0 |
| 26 | Gkogka, Klevis | 1597 | GRE | F | −17N | +27B | −4N | +23B | F | F | 2.0 | 11.0 | 11.0 | 3.00 | 1622 | -0.4 |
| 27 | Markus, Avshalom | 0 | ISR | −20B | +31N | −26N | −18B | F | −14N | −19B | 1.0 | 14.5 | 15.0 | 0.50 | 1356 | 0.0 |
| 28 | Lempesis, Andreas | 1451 | GRE | −1B | −12N | +31B | F | F | F | −15N | 1.0 | 14.0 | 14.0 | 0.50 | 1430 | -4.0 |
| 29 | Gkogka, Elvis | 1582 | GRE | F | −14N | −25B | +22N | F | F | F | 1.0 | 9.0 | 9.0 | 2.50 | 1530 | -3.0 |
| 30 | Koukoulis, Georgios | 1512 | GRE | −8B | =25N | −19B | −23N | F | F | −18N | 0.5 | 15.0 | 15.0 | 1.00 | 851 | -54.0 |
| 31 | Gerardou, Eleni | 1534 | GRE | −2N | −27B | −28N | −15B | F | −24N | =23B | 0.5 | 14.5 | 14.5 | 1.00 | 1254 | -55.6 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Bartzos, IasonasGRE+54.83.5 pts · #10
- 2Vamvoukou, Maria InesGRE+50.03.5 pts · #11
- 3Antoniadis, ArtiomGRE+43.25.5 pts · #1
- 1Chatzipavlou, OdysseasGRE-56.42.5 pts · #29
- 2Gerardou, EleniGRE-55.60.5 pts · #30
- 3Koukoulis, GeorgiosGRE-54.00.5 pts · #31
- R3+234 Elo gap
- R3+190 Elo gap
- R3+189 Elo gap