Porin turnaus Group B
Open SwissStandard
16 players participated in this 4-round tournament, held from 18 Oct 2025 to 19 Oct 2025 in Pori, Finland. Top 10 Elo average was 1703, and top seed was Anssi Halmesvirta (🇫🇮 FIN, 1846).
Jaakko Kauko (🇫🇮 FIN, 0) won with 3.5/4, ahead of Paul Marjanen (3.0) and Mikko Seilonen (3.0). Kauko broke clear in the final round.
The biggest upset came in round 4: Konstantinos Gatzios (1694) beat Anssi Halmesvirta (1846), a +152-point gap.
Location
🇫🇮Pori, Finland
Dates
18 Oct 2025 → 19 Oct 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 4 rounds
Federations · 1 represented
🇫🇮Finland×16
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 4 roundsJaakko Kauko led from R4; +0.5-point edge over the runner-up.
Co-leaders
8
2
4
1
R4–R4 · LEAD HELD
Jaakko Kauko held the sole lead from R4 through R4 without losing it.
R2–R4 · WIN STREAK
Aaron Ahtola won 3 in a row (R2–R4).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Jaakko Kauko | * | — | — | ½ |
| 2Aaron Ahtola | — | * | — | — |
| 3Mikko Seilonen | — | — | * | ½ |
| 4Paul Marjanen | ½ | — | ½ | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Kauko, Jaakko | 0 | FIN | +8B | +10N | =2B | +6N | 3.5 | 7.5 | 9.5 | 8.00 | 1744 | 0.0 |
| 2 | Marjanen, Paul | 0 | FIN | +13N | +9B | =1N | =3B | 3.0 | 8.5 | 9.5 | 6.25 | 1728 | 0.0 |
| 3 | Seilonen, Mikko | 1796 | FIN | +7N | =11B | +5N | =2N | 3.0 | 8.0 | 9.5 | 7.25 | 1945 | +20.8 |
| 4 | Ahtola, Aaron | 1622 | FIN | −5N | +16B | +9N | +8B | 3.0 | 6.5 | 6.5 | 4.00 | 1856 | +48.8 |
| 5 | Eerikainen, Risto | 1770 | FIN | +4B | =6N | −3B | +11N | 2.5 | 8.5 | 10.0 | 5.75 | 1803 | +3.4 |
| 6 | Kaitila, Aleksi | 1711 | FIN | +16N | =5B | +11N | −1B | 2.5 | 7.5 | 7.5 | 2.75 | 1969 | +18.8 |
| 7 | Lehtonen, Jari | 1543 | FIN | −3B | =14B | +13N | +12N | 2.5 | 5.5 | 6.5 | 3.00 | 1754 | +31.2 |
| 8 | Sjoskog, Tommy | 1650 | FIN | −1N | +15B | +10B | −4N | 2.0 | 8.5 | 9.5 | 3.00 | 1761 | +9.2 |
| 9 | Jarvinen, Joel | 1618 | FIN | +12B | −2N | −4B | +15N | 2.0 | 7.5 | 8.5 | 2.50 | 1736 | +18.4 |
| 10 | Gatzios, Konstantinos | 1694 | FIN | +15N | −1B | −8N | +14B | 2.0 | 6.5 | 7.5 | 2.00 | 1820 | +9.8 |
| 11 | Jaakkola, Vesa | 1704 | FIN | +14N | =3N | −6B | −5B | 1.5 | 8.0 | 9.0 | 2.50 | 1694 | -1.6 |
| 12 | Jarvinen, Miika | 1620 | FIN | −9N | +13B | =14N | −7B | 1.5 | 5.5 | 6.5 | 1.50 | 1396 | -32.8 |
| 13 | Zhu, Yunqing | 0 | FIN | −2B | −12N | −7B | +16N | 1.0 | 7.0 | 7.0 | 0.00 | 1467 | 0.0 |
| 14 | Halmesvirta, Anssi | 1846 | FIN | −11B | =7N | =12B | −10N | 1.0 | 6.0 | 7.5 | 2.00 | 1447 | -40.8 |
| 15 | Vuorinen, Juha | 1591 | FIN | −10B | −8N | +16N | −9B | 1.0 | 6.0 | 6.0 | 0.00 | 1451 | -14.2 |
| 16 | Palmu, Petri | 1614 | FIN | −6B | −4N | −15B | −13B | 0.0 | 6.5 | 7.5 | 0.00 | 841 | -55.6 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Ahtola, AaronFIN+48.83.0 pts · #2
- 2Lehtonen, JariFIN+31.22.5 pts · #11
- 3Seilonen, MikkoFIN+20.83.0 pts · #5
Top rating losers
- 1Palmu, PetriFIN-55.60.0 pts · #16
- 2Halmesvirta, AnssiFIN-40.81.0 pts · #13
- 3Jarvinen, MiikaFIN-32.81.5 pts · #15
Biggest upsets
- R4+152 Elo gap
- R1+142 Elo gap