RSB Open 2025 - Groep A
33 players participated in this 7-round tournament, held from 18 Aug 2025 to 29 Aug 2025 in Rotterdam, Netherlands. 1 titled players from 2 federations. Top 10 Elo average was 2131, and top seed was Mees Van Batenburg (🇳🇱 NED, 2225).
Marijn Den Hartog (🇳🇱 NED, 2201) won with 6.0/7, ahead of Dylan Edwardss (5.5) and Mees Van Batenburg (5.0). Den Hartog won solo starting round 5.
The biggest upset came in round 7: Jesse Frederiks (1763) beat Henk Ochtman (2099), a +336-point gap.
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How it unfolded
Top 6 · 7 roundsMarijn Den Hartog led from R5; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.
Marijn Den Hartog held the sole lead from R5 through R7 without losing it.
Marijn Den Hartog drew with Dylan Edwardss (Black).
Marijn Den Hartog 3 wins (R1–R3)Dylan Edwardss 3 wins (R1–R3)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Marijn Den Hartog | * | ½ | — | ½ |
| 2Dylan Edwardss | ½ | * | — | 1 |
| 3Rob Van der Plas | — | — | * | ½ |
| 4Mees Van Batenburg | ½ | 0 | ½ | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Den Hartog, Marijn | 2201 | NED | +8B | +9N | +6B | =2N | +5B | +13B | =3N | 6.0 | 26.0 | 29.0 | 23.75 | 2370 | +26.0 |
| 2 | Edwardss, Dylan | 2094 | NED | +25B | +3N | +22B | =1B | −6N | +15N | +5B | 5.5 | 24.5 | 26.5 | 19.50 | 2323 | +40.4 |
| 3 | Van Batenburg, Mees | 2225 | NED | +32N | −2B | +11N | +27B | =4N | +6B | =1B | 5.0 | 25.5 | 26.0 | 15.00 | 2193 | -4.4 |
| 4 | Van der Plas, Rob | 2109 | NED | +24B | =7N | +20B | −5N | =3B | +14N | +16B | 5.0 | 21.5 | 23.5 | 15.00 | 2165 | +12.0 |
| 5 | Gijsen, William | 2146 | NED | +11N | +26B | F | +4B | −1N | +12B | −2N | 4.0 | 25.5 | 25.5 | 14.00 | 2152 | +1.6 |
| 6 | Ochtman, Henk | 2099 | NED | +29N | +30B | −1N | +19B | +2B | −3N | −13B | 4.0 | 23.0 | 24.0 | 10.00 | 2019 | -11.0 |
| 7 | Pietrow, Andrzej | 1999 | NED | +13B | =4B | =10N | F | −12N | +24B | +27N | 4.0 | 18.5 | 18.5 | 10.75 | 2071 | +12.6 |
| 8 | Verschoor, Scott | 1974 | NED | −1N | +29B | F | −24N | +31B | +33N | +19B | 4.0 | 14.0 | 14.5 | 5.00 | 2047 | +11.4 |
| 9 | Le Clercq, Maxim | 2089 | NED | +19N | −1B | F | +21N | =14B | −18N | +17B | 3.5 | 20.5 | 23.0 | 9.50 | 2031 | -7.6 |
| 10 | Timmerman, GertFM | 2144 | NED | +21B | −16N | =7B | −14N | −22B | +29N | +23N | 3.5 | 17.5 | 18.5 | 8.00 | 1954 | -32.4 |
| 11 | De Wit, Cor | 1942 | NED | −5B | +31N | −3B | +25N | +30B | =17N | F | 3.5 | 16.0 | 16.0 | 5.50 | 2029 | +13.8 |
| 12 | Leorato, Imanol | 2055 | FRA | =20B | +28N | F | F | +7B | −5N | +15B | 3.5 | 15.0 | 15.0 | 9.75 | 2099 | +13.6 |
| 13 | Frederiks, Jesse | 1763 | NED | −7N | F | F | +26B | +16B | −1N | +6N | 3.0 | 22.5 | 22.5 | 9.00 | 2066 | +30.8 |
| 14 | Segers, Albert | 1984 | NED | =27N | =18B | =19N | +10B | =9N | −4B | F | 3.0 | 19.0 | 19.0 | 8.75 | 1965 | -2.4 |
| 15 | Beijen, Mark | 1980 | NED | F | −20N | +25B | +22N | +17B | −2B | −12N | 3.0 | 19.0 | 19.0 | 7.50 | 1996 | +2.8 |
| 16 | Aarts, Joaquin | 2002 | NED | +23N | +10B | F | F | −13N | +20B | −4N | 3.0 | 16.5 | 16.5 | 8.50 | 1991 | 0.0 |
| 17 | Kerkmeester, Cedric | 2022 | NED | −30N | =27B | +32N | +28B | −15N | =11B | −9N | 3.0 | 14.0 | 14.5 | 4.50 | 1853 | -62.0 |
| 18 | Lee, Jungbin | 1895 | NED | =22B | =14N | F | F | =27N | +9B | =21N | 3.0 | 13.0 | 13.0 | 8.25 | 2039 | +19.0 |
| 19 | Van de Velde, Matthijs | 1839 | NED | −9B | +21N | =14B | −6N | F | +28B | −8N | 2.5 | 18.5 | 18.5 | 5.50 | 1922 | +22.8 |
| 20 | t Hart, Johan | 1803 | NED | =12N | +15B | −4N | F | +26B | −16N | F | 2.5 | 16.5 | 16.5 | 6.75 | 1950 | +26.4 |
| 21 | Rensen, Martin | 1902 | NED | −10N | −19B | +23N | −9B | F | +30N | =18B | 2.5 | 16.0 | 16.5 | 5.00 | 1866 | -7.6 |
| 22 | Evengroen, Jan | 2144 | NED | =18N | +33B | −2N | −15B | +10N | F | F | 2.5 | 15.5 | 15.5 | 5.50 | 2011 | -17.2 |
| 23 | Van der Velden, Rens | 1777 | NED | −16B | −24N | −21B | =32B | +25N | +31N | −10B | 2.5 | 14.0 | 14.5 | 3.25 | 1835 | +7.8 |
| 24 | Bhawsar, Ashwath | 1888 | NED | −4N | +23B | −26N | +8B | F | −7N | F | 2.0 | 17.5 | 17.5 | 6.50 | 1965 | +16.0 |
| 25 | Lafeber, Evert | 1855 | NED | −2N | +32B | −15N | −11B | −23B | F | +33N | 2.0 | 15.5 | 15.5 | 1.00 | 1827 | -4.8 |
| 26 | Hoogland, Bauke | 2007 | NED | +31B | −5N | +24B | −13N | −20N | F | F | 2.0 | 14.0 | 14.0 | 3.00 | 1806 | 0.0 |
| 27 | Yantur, Arda | 1714 | NED | =14B | =17N | F | −3N | =18B | F | −7B | 1.5 | 22.0 | 24.0 | 4.50 | 1854 | +27.6 |
| 28 | Koes, Richard | 1824 | NED | F | −12B | +33N | −17N | =29B | −19N | F | 1.5 | 10.5 | 10.5 | 1.00 | 1796 | -4.2 |
| 29 | Van Houten, Arno | 1868 | NED | −6B | −8N | F | =33B | =28N | −10B | −31N | 1.0 | 14.5 | 14.5 | 1.00 | 1689 | -26.2 |
| 30 | Lee, Jungmin | 1793 | NED | +17B | −6N | F | F | −11N | −21B | F | 1.0 | 13.0 | 13.0 | 3.00 | 1798 | 0.0 |
| 31 | Leorato, Cristiano | 1789 | FRA | −26N | −11B | F | F | −8N | −23B | +29B | 1.0 | 13.0 | 13.0 | 1.00 | 1698 | -18.8 |
| 32 | Torczynski, Peter | 1976 | NED | −3B | −25N | −17B | =23N | F | F | F | 0.5 | 15.0 | 15.0 | 1.25 | 1648 | -31.0 |
| 33 | Holwijn, Melvin | 1943 | NED | F | −22N | −28B | =29N | F | −8B | −25B | 0.5 | 11.0 | 11.0 | 0.50 | 1567 | -41.6 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Edwardss, DylanNED+40.45.5 pts · #2
- 2Frederiks, JesseNED+30.83.0 pts · #23
- 3Yantur, ArdaNED+27.61.5 pts · #26
- 1Kerkmeester, CedricNED-62.03.0 pts · #17
- 2Holwijn, MelvinNED-41.60.5 pts · #32
- 3Timmerman, GertFMNED-32.43.5 pts · #11
- R7+336 Elo gap
- R4+244 Elo gap
- R5+239 Elo gap