KNSB FIDE
SF

Sono Folkers

Rated since January 2023

1880 Classic

RIVALRY

Nemesis
Knobbe, E. (Elise)
Games: 4 · Win rate: 50%
Kryptonite
Velzen van, M. (Martin)
Games: 3 · Win rate: 0%
Easy Target
Luijkx, D.M. (Dagmar)
Games: 7 · Win rate: 100%

The good & the bad

Best wins
LEENES, R.E. (ROBERT) 2006
8949 NOSBO FSB jeugd 2023-2024 NOSBO rapidkampioenschap · Sunday 28 April 2024
FENG, Y. (ELYSIA) 1923
8456 Chess Festival Groningen Compact · Friday 27 December 2024
GRAAF DE, M.D. (MARK) 1874
7752 Hoogeveen 2023 Middaggroep Groep A · Saturday 28 October 2023
BRUINSMA, J. (JURA) 1866
8456 Chess Festival Groningen Compact · Monday 30 December 2024
BAARS, T. (TIJE) 1843
8456 Chess Festival Groningen Compact · Thursday 26 December 2024
Worst losses
BOSMA, J. (JONATHAN) 1117
6403 GP voor de jeugd Dokkum Groep A · Saturday 7 January 2023
ROERSMA, D. (DYLAN) 1173
6722 Emmen GP 2023 Groep A · Saturday 4 March 2023
HEIKAMP, H. (HENDRIK) 1291
6403 GP voor de jeugd Dokkum Groep A · Saturday 7 January 2023
JORRITSMA, E.A. (ELI ALIA) 1354
7297 NOSBO GP-finale 2023 Groep A · Sunday 11 June 2023
WIT DE, E. (EVAN) 1373
6278 GP Sint-Jabik Groep A · Saturday 17 December 2022
Chessfestival Groningen Vierkampen Groep A Monday 22 December 2025 +0–3=0 -64.0
Chess Festival Groningen Compact Saturday 21 December 2024 +3–0=2 +64.6
Chess Festival Groningen Vierkampen Saturday 21 December 2024 +1–2=0 -3.8
Chess Festival Groningen Compact C Thursday 21 December 2023 +8–2=0 +80.0
Chess Festival Groningen Vierkampen Thursday 21 December 2023 +6–0=0 +100.6
Hoogeveen 2023 Middaggroep Groep A Saturday 21 October 2023 +6–4=8 +180.9
Weekendtoernooi Groninger Combinatie / PK NOSBO Groep A Thursday 18 May 2023 +4–4=4 +49.7
Kwalificatie NK ABC 3 Groep A Saturday 22 February 2025 +2–3=1 -17.0
KNSB competitie 2024-2025 Klasse 5 ronde 7 Saturday 21 September 2024 +1–0=0 +4.2
KNSB competitie 2024-2025 Klasse 5 ronde 4 Saturday 21 September 2024 +0–0=1 +4.0
KNSB competitie 2024-2025 Klasse 5 ronde 3 Saturday 21 September 2024 +1–0=0 +6.8
KNSB competitie 2024-2025 Klasse 5 ronde 1 Saturday 21 September 2024 +1–0=0 +13.9
Open Gronings Blitz Kampioenschap 2024 (Tijdens NK ABC) Wednesday 1 May 2024 +3–5=1 -38.0
Kwalificatie NK ABC 3 Jeugd B Saturday 10 February 2024 +3–2=2 +4.0
NOSBO FSB jeugd 2023-2024 PJK AB Wednesday 1 November 2023 +5–0=0 +27.3
NOSBO FSB jeugd 2023-2024 NOSBO rapidkampioenschap Wednesday 1 November 2023 +3–4=0 -26.2
NOSBO-competitie 2023-2024 April 2024 Sunday 1 October 2023 +4–0=0 +53.0
NOSBO-competitie 2023-2024 Maart 2024 Sunday 1 October 2023 +2–0=0 +9.6
NOSBO-competitie 2023-2024 Januari 2024 Sunday 1 October 2023 +2–0=0 +33.2
NOSBO competitie 2023-2024 November 2023 Sunday 1 October 2023 +0–2=0 -46.7
KNSB competitie 2023-2024 Klasse 4 ronde 9 Saturday 16 September 2023 +0–2=0 -42.4
KNSB competitie 2023-2024 Klasse 4 ronde 7 Saturday 16 September 2023 +0–2=0 -32.9
KNSB competitie 2023-2024 Klasse 4 ronde 6 Saturday 16 September 2023 +0–2=0 -35.9
KNSB competitie 2023-2024 Klasse 4 ronde 5 Saturday 16 September 2023 +0–2=0 -24.2
KNSB competitie 2023-2024 Klasse 4 ronde 4 Saturday 16 September 2023 +2–0=0 +49.6
KNSB competitie 2023-2024 Klasse 4 ronde 3 Saturday 16 September 2023 +2–0=0 +45.3
KNSB competitie 2023-2024 Klasse 4 ronde 2 Saturday 16 September 2023 +2–0=0 +4.6
NOSBO GP-finale 2023 Groep A Sunday 11 June 2023 +3–1=1 +21.7
Emmen GP 2023 Groep A Saturday 4 March 2023 +4–1=0 -6.3
NJK kwalificatietoernooi 3 Groep B jeugd Saturday 18 February 2023 +2–3=2 -29.7
Paardensprong jeugdtoernooi Topgroep Saturday 4 February 2023 +2–2=2 -53.7
GP Hennie Collignon 2023 Groep A Saturday 28 January 2023 +3–0=2 -6.5
GP Bolsward Groep A Saturday 21 January 2023 +5–0=0 +29.6
GP voor de jeugd Dokkum Groep A Saturday 7 January 2023 +3–2=0 -33.6
NOSBO FSB 2022-2023 ONNJK 2023 Sunday 1 January 2023 +4–2=1 -28.9
NOSBO FSB 2022-2023 NJC NJC - Maart Sunday 1 January 2023 +0–1=0 -11.5
NOSBO FSB 2022-2023 NJC NJC - Februari Sunday 1 January 2023 +0–1=0 -25.3
NOSBO GP Chessfestival 2022 GP Chessfestival 2022 Wednesday 28 December 2022 +4–0=1 -5.3
Chess Festival Groningen Mini Wednesday 21 December 2022 +4–0=2 +41.4
GP Sint-Jabik Groep A Saturday 17 December 2022 +3–1=1 -34.0
NOSBO competitie 2022-2023 Mei 2023 Monday 24 October 2022 +0–2=0 -44.6
NOSBO competitie 2022-2023 April 2023 Monday 24 October 2022 +2–0=0 +48.9
KNSB competitie 2022-2023 Klasse 3 ronde 8 Saturday 17 September 2022 +0–2=0 -20.2

Rating History

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Peak Ratings

Classic 1957 Feb. 1, 2025
Rapid 1876 June 1, 2024
Blitz 1833 Oct. 1, 2024

Games

Wins 100
Losses 57
Draws 31
Win Rate 53%

Performance by Color

Color Wins Draws Losses Win Rate
White 55 17 25 57%
Black 45 14 32 49%

Recent Matches

Uitermark, I.D. (Imre) (1918) Wednesday 24 December 2025 LOSS -21.5
Waardenburg, M.D. (Marlinde) (1894) Tuesday 23 December 2025 LOSS -22.8
Poelstra, B.M. (Ben) (1948) Monday 22 December 2025 LOSS -19.8
Duindam, H. (Hedde) (1580) Saturday 5 April 2025 WIN +4.2
Blom, R. (Rens) (1981) Sunday 23 February 2025 LOSS -18.7
Arendonk van, P. (Polle) (1890) Sunday 23 February 2025 LOSS -23.7
Kumar, P.S. (Prajit Sai) (2246) Saturday 22 February 2025 DRAW +13.8
Henckens, E. (Elof) (1780) Saturday 22 February 2025 WIN +10.7
Knobbe, E. (Elise) (1838) Saturday 22 February 2025 WIN +13.5
Blok, X. (Xaveer) (2094) Saturday 22 February 2025 LOSS -12.6
Bruinsma, J. (Jura) (1866) Monday 30 December 2024 WIN +18.6
Baaren van, J.A. (Joris) (1964) Sunday 29 December 2024 DRAW +4.0
Velzen van, M. (Martin) (1947) Saturday 28 December 2024 DRAW +3.1
Feng, Y. (Elysia) (1923) Friday 27 December 2024 WIN +21.7
Baars, T. (Tije) (1843) Thursday 26 December 2024 WIN +17.3
Waardenburg, F.H. (Feline) (1888) Tuesday 24 December 2024 LOSS -20.2
Baarspul, B.R.J. (Bram) Monday 23 December 2024 LOSS
Kreyfelt von, E.P. (Ernst) (1827) Sunday 22 December 2024 WIN +16.4
Jorritsma, W. (Wander) (1965) Saturday 14 December 2024 DRAW +4.0
Nagel, D. (Doede) (1611) Saturday 23 November 2024 WIN +6.8