RSB Open 2025 - Groep B
Open SwissStandard
48 players participated in this 7-round tournament, held from 18 Aug 2025 to 29 Aug 2025 in Rotterdam, Netherlands. Top 10 Elo average was 1856, and top seed was Hans Ranft (🇳🇱 NED, 1896).
Murdoch Mac Lean (🇳🇱 NED, 1821) won with 6.0/7, ahead of Robert Kuiper (5.5) and Hans Van Nieuwenhuizen (5.0). Mac Lean took the lead from round 6.
The biggest upset came in round 3: Robert Kuiper (1400) beat Jan De Jong (1876), a +476-point gap.
Location
🇳🇱Rotterdam, Netherlands
Dates
18 Aug 2025 → 29 Aug 2025
Time control
Standard: All Moves in 90 Min. Incr. 15 Sec. / /
System
Swiss · 7 rounds
Federations · 1 represented
🇳🇱Netherlands×48
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 7 roundsMurdoch Mac Lean led from R6; +0.5-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R6.
Co-leaders
20
5
2
3
1
1
1
R6 · LEADER CHANGE27 Aug
Murdoch Mac Lean takes the sole lead (5.0/6).
R6 · HEAD-TO-HEAD · WINNER VS 2ND
Murdoch Mac Lean beat Robert Kuiper (White).
WIN STREAKS · 2 top finishers
Murdoch Mac Lean 4 wins (R4–R7)Robert Kuiper 3 wins (R1–R3)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Murdoch Mac Lean | * | 1 | — | — |
| 2Robert Kuiper | 0 | * | — | 1 |
| 3Oleg Nadrshin | — | — | * | — |
| 4Henk Prins | — | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Mac Lean, Murdoch | 1821 | NED | +26B | =15N | =20B | +30N | +14N | +2B | +6N | 6.0 | 23.5 | 26.5 | 23.00 | 2008 | +46.0 |
| 2 | Kuiper, Robert | 1400 | NED | +5N | +43B | +8B | =3N | +16B | −1N | +23B | 5.5 | 27.0 | 28.5 | 20.00 | 1863 | 0.0 |
| 3 | Van Nieuwenhuizen, Hans | 1895 | NED | +10N | +17B | +6N | =2B | F | =4B | +8N | 5.0 | 26.5 | 26.5 | 21.25 | 2094 | +14.0 |
| 4 | Nadrshin, Oleg | 1836 | NED | +18B | =29N | +15B | =19N | +13B | =3N | =9B | 5.0 | 23.5 | 26.5 | 18.75 | 1917 | +31.2 |
| 5 | Prins, Henk | 1739 | NED | −2B | +47N | +33B | −6B | +40N | +37N | +14B | 5.0 | 19.5 | 19.5 | 9.50 | 1953 | +53.6 |
| 6 | Van de Griend, Johan | 1857 | NED | +33B | +31N | −3B | +5N | =19B | +16N | −1B | 4.5 | 26.0 | 28.5 | 15.75 | 1884 | +5.8 |
| 7 | Tjin a Lien, Ike | 1747 | NED | +47B | −8N | =44B | =18N | =15B | +26N | +19B | 4.5 | 18.5 | 18.5 | 10.50 | 1848 | +10.4 |
| 8 | De Jong, Jan | 1876 | NED | +42N | +7B | −2N | F | +24B | +19N | −3B | 4.0 | 23.5 | 23.5 | 13.00 | 1830 | 0.0 |
| 9 | Van Vleuten, Ronald | 1822 | NED | +37N | =24B | =11N | F | =10B | +18B | =4N | 4.0 | 22.0 | 22.0 | 13.75 | 1860 | +5.2 |
| 10 | De Kort, Marcel | 1714 | NED | −3B | +28N | F | +35B | =9N | =14B | +17N | 4.0 | 21.5 | 21.5 | 12.75 | 1859 | 0.0 |
| 11 | Roshania, Jimmy | 1678 | NED | +27B | =16N | =9B | −17B | +46N | −13N | +37B | 4.0 | 20.0 | 20.5 | 9.25 | 1772 | +29.6 |
| 12 | Van der Hoek, Willem | 1671 | NED | =23B | F | +41N | −21B | =27N | +39N | +31B | 4.0 | 16.5 | 17.0 | 9.75 | 1810 | +18.8 |
| 13 | Mastop, Guido | 1753 | NED | +48N | +14B | F | F | −4N | +11B | +22N | 4.0 | 16.0 | 16.0 | 11.00 | 1945 | +39.6 |
| 14 | Ranft, Hans | 1896 | NED | +21B | −13N | +31B | +20N | −1B | =10N | −5N | 3.5 | 26.0 | 29.0 | 12.00 | 1752 | -23.0 |
| 15 | Wortman, Rik | 1652 | NED | +34N | =1B | −4N | =27B | =7N | −21B | +43N | 3.5 | 24.5 | 26.0 | 10.75 | 1787 | +25.0 |
| 16 | Uittenbogaard, Hans | 1815 | NED | +32N | =11B | +22N | +24B | −2N | −6B | F | 3.5 | 24.0 | 24.0 | 12.00 | 1813 | -0.2 |
| 17 | Brus, Derk | 1769 | NED | +39B | −3N | +37B | +11N | =25B | −23N | −10B | 3.5 | 22.0 | 24.0 | 9.75 | 1790 | +7.2 |
| 18 | Huang, Ziyang | 1676 | NED | −4N | +45B | =35N | =7B | +36B | −9N | =30N | 3.5 | 21.5 | 22.5 | 8.50 | 1720 | +13.2 |
| 19 | Van Heeren, Arie | 1786 | NED | =41N | +38B | +46N | =4B | =6N | −8B | −7N | 3.5 | 21.5 | 22.0 | 8.00 | 1689 | -7.6 |
| 20 | Eveleens, Ed | 1745 | NED | +40N | =25B | =1N | −14B | −22N | =28B | +44N | 3.5 | 21.0 | 22.0 | 8.75 | 1499 | -18.0 |
| 21 | Brandsma, Jeroen | 1714 | NED | −14N | +32B | F | +12N | −23B | +15N | =36B | 3.5 | 20.0 | 20.0 | 11.75 | 1761 | +12.4 |
| 22 | Pelsmaeker, Ronald | 1598 | NED | +35N | F | −16B | +29N | +20B | =25N | −13B | 3.5 | 20.0 | 20.0 | 10.75 | 1843 | +66.0 |
| 23 | Van Brussel, Bert | 1833 | NED | =12N | +41B | F | F | +21N | +17B | −2N | 3.5 | 18.0 | 18.0 | 10.50 | 1991 | +10.8 |
| 24 | Zaydulidi, Kristian | 1738 | NED | +28B | =9N | +36B | −16N | −8N | +44B | F | 3.5 | 18.0 | 18.0 | 8.50 | 1797 | +10.0 |
| 25 | Van Gent, Aad | 1877 | NED | +30B | =20N | +29B | F | =17N | =22B | F | 3.5 | 16.5 | 16.5 | 11.25 | 1746 | 0.0 |
| 26 | Prins, Arie | 1614 | NED | −1N | −34B | +48N | =42B | +32N | −7B | =27N | 3.0 | 20.5 | 20.5 | 5.25 | 1545 | 0.0 |
| 27 | Zwanenburg, Marco | 1846 | NED | −11N | F | +47B | =15N | =12B | =38N | =26B | 3.0 | 18.5 | 18.5 | 6.25 | 1626 | -43.2 |
| 28 | Stolk, Chris | 1400 | NED | −24N | −10B | +32N | −38B | +48B | =20N | =34B | 3.0 | 18.5 | 18.5 | 6.00 | 1645 | 0.0 |
| 29 | Kuin, Arjen | 1729 | NED | +44N | =4B | −25N | −22B | +42N | =33B | F | 3.0 | 17.0 | 17.0 | 6.25 | 1700 | -6.4 |
| 30 | Lagendijk, Mark | 1687 | NED | −25N | +48B | +34N | −1B | =44N | F | =18B | 3.0 | 16.5 | 16.5 | 4.75 | 1774 | +14.0 |
| 31 | Van Alphen, Alex | 1739 | NED | +45N | −6B | −14N | −40B | +41N | +46B | −12N | 3.0 | 16.0 | 16.5 | 3.00 | 1008 | -48.8 |
| 32 | Muizelaar, Dirk | 1600 | NED | −16B | −21N | −28B | +47N | −26B | +48N | +45B | 3.0 | 14.0 | 14.0 | 1.00 | 1553 | 0.0 |
| 33 | Visser, Jos | 1680 | NED | −6N | =40B | −5N | +41B | F | =29N | =38B | 2.5 | 17.5 | 17.5 | 4.75 | 1502 | -24.8 |
| 34 | Priem, Ian | 1826 | NED | −15B | +26N | −30B | −37N | F | +42B | =28N | 2.5 | 16.0 | 16.0 | 6.00 | 1470 | -74.8 |
| 35 | Yuen, Shau-Ming | 1814 | NED | −22B | +39N | =18B | −10N | −37B | F | +46N | 2.5 | 15.5 | 15.5 | 4.25 | 1528 | -61.2 |
| 36 | Schouten, Martin | 1755 | NED | F | F | −24N | +45B | −18N | +40B | =21N | 2.5 | 13.0 | 13.0 | 4.25 | 1436 | -47.6 |
| 37 | Van Gorkum, Klaas | 1628 | NED | −9B | F | −17N | +34B | +35N | −5B | −11N | 2.0 | 22.0 | 24.5 | 5.00 | 1650 | +7.2 |
| 38 | Van Randwijk, Willem | 1640 | NED | F | −19N | −43B | +28N | F | =27B | =33N | 2.0 | 13.5 | 13.5 | 5.75 | 1564 | 0.0 |
| 39 | Koppenens, Ben | 1559 | NED | −17N | −35B | F | F | +45N | −12B | +40N | 2.0 | 12.5 | 12.5 | 2.50 | 951 | -15.4 |
| 40 | Van Dop, Aad | 1450 | NED | −20B | =33N | F | +31N | −5B | −36N | −39B | 1.5 | 18.5 | 18.5 | 4.25 | 1510 | 0.0 |
| 41 | De Wild, Fred | 1576 | NED | =19B | −23N | −12B | −33N | −31B | F | +47N | 1.5 | 16.5 | 16.5 | 1.75 | 1509 | 0.0 |
| 42 | Tromer, Stephan | 1686 | NED | −8B | F | F | =26N | −29B | −34N | +48B | 1.5 | 12.5 | 12.5 | 1.50 | 978 | -30.0 |
| 43 | Engelen, Niels | 1716 | NED | =46B | −2N | +38N | F | F | F | −15B | 1.5 | 11.5 | 11.5 | 2.25 | 852 | -23.6 |
| 44 | Wojcik, Miroslaw | 1400 | NED | −29B | F | =7N | F | =30B | −24N | −20B | 1.0 | 17.5 | 17.5 | 3.75 | 1489 | 0.0 |
| 45 | Soroka, Egor | 1400 | NED | −31B | −18N | F | −36N | −39B | +47B | −32N | 1.0 | 14.0 | 14.0 | 0.00 | 1407 | 0.0 |
| 46 | Kruithof, Glenn | 1293 | NED | =43N | F | −19B | F | −11B | −31N | −35B | 0.5 | 18.5 | 18.5 | 0.75 | 1381 | 0.0 |
| 47 | Heukels, Theo | 1504 | NED | −7N | −5B | −27N | −32B | F | −45N | −41B | 0.0 | 18.0 | 18.0 | 0.00 | 977 | -21.2 |
| 48 | Vogel, Toby | 1550 | NED | −13B | −30N | −26B | F | −28N | −32B | −42N | 0.0 | 17.5 | 17.5 | 0.00 | 909 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Pelsmaeker, RonaldNED+66.03.5 pts · #17
- 2Prins, HenkNED+53.65.0 pts · #6
- 3Mac Lean, MurdochNED+46.06.0 pts · #4
Top rating losers
- 1Priem, IanNED-74.82.5 pts · #37
- 2Yuen, Shau-MingNED-61.22.5 pts · #30
- 3Van Alphen, AlexNED-48.83.0 pts · #44
Biggest upsets
- R3+476 Elo gap
- R7+433 Elo gap
- R5+415 Elo gap