Chessfestival Groningen 2025 Open C
Open SwissStandard
29 players participated in this 9-round tournament, held from 21 Dec 2025 to 30 Dec 2025 in Groningen, Netherlands. 6 federations represented. Top 10 Elo average was 1753, and top seed was Simon Van Dijk (🇳🇱 NED, 1816).
Henk Pompstra (🇳🇱 NED, 1808) won with 7.5/9, ahead of Ilya Chernokol (6.5) and Stoyan Kostov (6.0). Pompstra took the lead from round 4.
The biggest upset came in round 3: Ilya Chernokol (1524) beat Julian Frieswijk (1753), a +229-point gap.
Location
🇳🇱Groningen, Netherlands
Dates
21 Dec 2025 → 30 Dec 2025
Time control
Standard: 90min/40moves+30min/end+30sec increment per move starting from move 1
System
Swiss · 9 rounds
Federations · 6 represented
🇳🇱Netherlands×21
FIDE (no federation)×2
🇮🇳India×2
🇨🇾Cyprus×1
🇫🇷France×1
🇺🇦Ukraine×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 9 roundsHenk Pompstra led from R4; +1.0-point edge over the runner-up.
Co-leaders
8
2
1
1
3
2
1
1
1
R4 · LEADER CHANGE24 Dec
Henk Pompstra takes the sole lead (3.5/4).
R7 · HEAD-TO-HEAD · WINNER VS 2ND
Henk Pompstra beat Ilya Chernokol (Black).
WIN STREAKS · 2 top finishers
Henk Pompstra 3+3 wins (R2–R4, R6–R8)Ilya Chernokol 5 wins (R2–R6)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Henk Pompstra | * | 1 | ½ | ½ |
| 2Ilya Chernokol | 0 | * | 1 | ½ |
| 3Stoyan Kostov | ½ | 0 | * | — |
| 4Jacques Renaud | ½ | ½ | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Pompstra, Henk | 1808 | NED | =3B | +7N | +27B | +5N | =4B | +9B | +2N | +18N | =6B | 7.5 | 43.5 | 46.0 | 37.25 | 1945 | +18.8 |
| 2 | Chernokol, Ilya | 1524 | UKR | −21B | +15B | +23N | +20B | +6N | +5N | −1B | +3B | =4N | 6.5 | 41.5 | 44.5 | 30.50 | 1840 | +115.6 |
| 3 | Kostov, Stoyan | 0 | NED | =1N | +10B | +11N | =9B | =5B | +19N | +6B | −2N | =15B | 6.0 | 43.0 | 46.5 | 29.00 | 1762 | 0.0 |
| 4 | Renaud, Jacques | 1743 | FRA | =8N | +29B | =22N | +7B | =1N | −10B | +24N | +9N | =2B | 6.0 | 41.0 | 41.0 | 25.00 | 1726 | -1.4 |
| 5 | Ten Hoor, Johan | 0 | NED | +17N | +23B | +18N | −1B | =3N | −2B | +8N | +10B | −7N | 5.5 | 43.0 | 46.0 | 23.50 | 1740 | 0.0 |
| 6 | Klimovich, Hanna | 1703 | FID | +14N | +16B | −9N | +22B | −2B | +11N | −3N | +19B | =1N | 5.5 | 41.0 | 44.5 | 23.25 | 1748 | +8.6 |
| 7 | Stulp, Maikel | 0 | NED | +12N | −1B | +21B | −4N | F | +25N | =15B | +11N | +5B | 5.5 | 38.5 | 38.5 | 23.00 | 1751 | 0.0 |
| 8 | Siburian, Marsudi | 0 | NED | =4B | −12N | +17N | −19B | +28B | +13N | −5B | +16N | +9B | 5.5 | 37.0 | 39.0 | 22.50 | 1732 | 0.0 |
| 9 | Van Essen, Tobias | 1757 | NED | +15N | =11B | +6B | =3N | +18B | −1N | +10N | −4B | −8N | 5.0 | 43.5 | 47.0 | 22.75 | 1834 | +30.4 |
| 10 | Van Dijk, Simon | 1816 | NED | =27B | −3N | +28B | +25N | +13B | +4N | −9B | −5N | F | 4.5 | 36.0 | 38.0 | 16.75 | 1829 | +4.8 |
| 11 | Van Velthoven, Paul | 1737 | NED | +26B | =9N | −3B | +27N | F | −6B | +14N | −7B | +19N | 4.5 | 35.0 | 35.0 | 15.50 | 1787 | +7.2 |
| 12 | Dekker, Ichelle | 1692 | NED | −7B | +8B | −16N | −14N | +21B | =20B | −22N | +27B | +26N | 4.5 | 32.5 | 35.0 | 16.25 | 1814 | +16.8 |
| 13 | De Wey Peters, Inno | 1696 | NED | =28B | −22N | +24B | +21N | −10N | −8B | +26N | +23B | −14N | 4.5 | 30.0 | 32.0 | 13.50 | 1898 | +42.8 |
| 14 | Van der Graaf, Pieter | 0 | NED | −6B | F | −20N | +12B | −19N | +17N | −11B | +25N | +13B | 4.0 | 33.0 | 33.0 | 16.00 | 1671 | 0.0 |
| 15 | Kolijn, Simon | 1661 | NED | −9B | −2N | F | +28N | F | +22B | =7N | +24B | =3N | 4.0 | 31.5 | 31.5 | 14.25 | 841 | -42.0 |
| 16 | Elferink, Duncan | 1707 | NED | +25B | −6N | +12B | −18N | F | −24B | +23N | −8B | +20N | 4.0 | 31.5 | 31.5 | 14.00 | 1807 | +31.6 |
| 17 | Oord, Jan | 1641 | NED | −5B | =26N | −8B | −23N | +29N | −14B | +28N | =20B | +27N | 4.0 | 29.0 | 29.0 | 7.75 | 1649 | +1.2 |
| 18 | Hadjiioannou, Michalis | 1659 | CYP | F | +21N | −5B | +16B | −9N | +23N | =19B | −1B | F | 3.5 | 36.5 | 36.5 | 12.25 | 1793 | +44.8 |
| 19 | Heeres, Felix | 1611 | NED | F | −27N | +26B | +8N | +14B | −3B | =18N | −6N | −11B | 3.5 | 34.5 | 34.5 | 14.25 | 1494 | -31.2 |
| 20 | Stapersma, Dick | 1725 | NED | =22B | =28N | +14B | −2N | −23B | =12N | =25B | =17N | −16B | 3.5 | 32.5 | 34.5 | 12.50 | 1453 | -42.8 |
| 21 | Tezanos, Gabriel | 1777 | FID | +2N | −18B | −7N | −13B | −12N | +28B | −27N | =26B | +29N | 3.5 | 32.0 | 32.0 | 10.00 | 1422 | -109.6 |
| 22 | Schulte, Berend | 0 | NED | =20N | +13B | =4B | −6N | F | −15N | +12B | F | =24N | 3.5 | 31.0 | 31.0 | 15.25 | 1703 | 0.0 |
| 23 | Frieswijk, Julian | 1753 | NED | +24N | −5N | −2B | +17B | +20N | −18B | −16B | −13N | F | 3.0 | 34.5 | 37.5 | 10.50 | 1534 | -70.0 |
| 24 | Rathin Khandhadia | 0 | IND | −23B | =25N | −13N | F | +27B | +16N | −4B | −15N | =22B | 3.0 | 30.5 | 30.5 | 9.75 | 1579 | 0.0 |
| 25 | Van t Riet, Flip | 1561 | NED | −16N | =24B | +29N | −10B | +26N | −7B | =20N | −14B | F | 3.0 | 30.5 | 30.5 | 6.25 | 1593 | +4.4 |
| 26 | Abhyuday Jha | 1474 | IND | −11N | =17B | −19N | +29B | −25B | +27N | −13B | =21N | −12B | 3.0 | 30.0 | 30.0 | 6.25 | 1477 | 0.0 |
| 27 | Hassing, Bert | 1645 | NED | =10N | +19B | −1N | −11B | −24N | −26B | +21B | −12N | −17B | 2.5 | 35.0 | 38.0 | 9.25 | 1553 | -19.2 |
| 28 | Wempe, Tijn | 0 | NED | =13N | =20B | −10N | −15B | −8N | −21N | −17B | +29B | F | 2.0 | 29.5 | 29.5 | 4.00 | 1446 | 0.0 |
| 29 | FIDE 1067621 | 0 | — | F | −4N | −25B | −26N | −17B | F | F | −28N | −21B | 0.0 | 21.5 | 21.5 | 0.00 | 839 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Chernokol, IlyaUKR+115.66.5 pts · #3
- 2Hadjiioannou, MichalisCYP+44.83.5 pts · #11
- 3De Wey Peters, InnoNED+42.84.5 pts · #16
Top rating losers
- 1Tezanos, GabrielFID-109.63.5 pts · #23
- 2Frieswijk, JulianNED-70.03.0 pts · #19
- 3Stapersma, DickNED-42.83.5 pts · #26
Biggest upsets
- R3+229 Elo gap
- R4+201 Elo gap
- R5+179 Elo gap