KNSB FIDE
BB

Bas de Boer

Rated since January 2023

2210 Classic
2144 Rapid
2183 Blitz

RIVALRY

Nemesis
Hauwert, N.C.F. (Nico)
Games: 3 · Win rate: 33%
Kryptonite
Beerdsen, T.A. (Thomas)
Games: 4 · Win rate: 0%

The good & the bad

Best wins
NGUYEN, PIOTR (IM) 2423
Riga Technical University Open 2024 - Tournament A · Sunday 11 August 2024
KOLLEN, Z. (ZYON) (FM) 2369
Belgian Interclubs Round 2025-2026 Ronde 2 · Sunday 12 October 2025
YU, JIANGWEI 2357
20e Open de Vandoeuvre 2024 - Tournoi A (plus de 1900 elo) · Thursday 4 January 2024
PHAM, K.V. (KHOI) (IM) 2341
6573 15e BPB Limburg Open 2023 Groep A · Friday 26 May 2023
CZERNEK, TYMON (FM) 2324
Rilton Cup 2023-2024 · Saturday 30 December 2023
Worst losses
BENIOSEV, DANIEL (CM) 1728
Riga Technical University Open 2024 - Tournament A · Monday 5 August 2024
LHOTSKA, ANNA (WFM) 1950
CZECH OPEN 2023 - A · Friday 21 July 2023
VALKENBURG, M. (MAX) 1957
Snelschaak Teams (tijdens NK 2024) · Saturday 13 July 2024
GOLDMANN, DAVID 1969
GRENKE Chess Open 2024 A-Open · Monday 1 April 2024
MON DE, G. (GINO) 2005
Snelschaak Teams (tijdens NK 2024) · Saturday 13 July 2024
Belgian Interclubs Round 2025-2026 Ronde 11 Sunday 19 April 2026 +0–1=0 -5.5
Oberliga NRW 2025-2026 Maerz 2026 Saturday 21 March 2026 +0–0=2 +3.7
Belgian Interclubs Round 2025-2026 Ronde 9 Sunday 15 March 2026 +0–0=1 -3.9
Belgian Interclubs Round 2025-2026 Ronde 8 Sunday 1 March 2026 +0–1=0 -6.1
Belgian Interclubs Round 2025-2026 Ronde 7 Sunday 8 February 2026 +0–0=1 +0.7
Oberliga NRW 2025-2026 Januar 2026 Saturday 17 January 2026 +1–0=1 +14.6
Belgian Interclubs Round 2025-2026 Ronde 5 Sunday 7 December 2025 +0–0=1 +1.7
Belgian Interclubs Round 2025-2026 Ronde 4 Sunday 23 November 2025 +1–0=0 +7.6
Belgian Interclubs Round 2025-2026 Ronde 3 Sunday 16 November 2025 +0–0=1 +2.8
Oberliga NRW 2025-2026 November 2025 Saturday 8 November 2025 +0–0=2 +0.1
Belgian Interclubs Round 2025-2026 Ronde 2 Sunday 12 October 2025 +1–0=0 +16.3
17e BPB Limburg Open 2025 Groep A Friday 6 June 2025 +2–3=2 +0.6
Open Dordrecht Rapidtoernooi Groep A Saturday 1 March 2025 +3–1=3 -16.5
Tata Steel Chess Tournament 2025 Weekendvierkampen Friday 17 January 2025 +0–1=2 -8.4
OSBO Snelschaakkampioenschap 2025 Voorrondes Saturday 4 January 2025 +6–1=2 +32.8
OSBO Snelschaakkampioenschap 2025 Finale A Saturday 4 January 2025 +6–8=2 +36.5
Chess Festival Groningen Open A Saturday 21 December 2024 +2–2=5 +11.3
39th European Club Cup Sunday 20 October 2024 +3–3=1 -16.0
Riga Technical University Open 2024 - Tournament A Monday 5 August 2024 +5–3=1 -9.6
HSG Open 2024 Groep A Friday 21 June 2024 +1–0=5 -4.8
16e BPB Limburg Open 2024 Groep A Friday 17 May 2024 +2–1=2 -3.6
Tata Steel Chess Tournament 2024 Weekendvierkampen Friday 12 January 2024 +1–0=2 +14.3
HSG Open 2023 Groep A Friday 23 June 2023 +2–1=3 -12.8
15e BPB Limburg Open 2023 Groep A Friday 26 May 2023 +2–1=4 +25.5
Tata Steel Chess Tournament 2023 Weekendvierkampen Friday 13 January 2023 +3–0=0 +20.8
OSBO-Cup 2025/2026 Februari 2026 Monday 1 December 2025 +0–0=1 +0.5
Oberliga NRW 2025-2026 Oktober 2025 Saturday 4 October 2025 +0–0=1 -0.3
Belgian Interclubs Round 2025-2026 Ronde 1 Sunday 28 September 2025 +0–0=1 +2.5
KNSB competitie 2025-2026 Klasse 1 ronde 6 Saturday 20 September 2025 +0–1=0 -10.1
KNSB competitie 2025-2026 KNSB Beker ronde 4 Saturday 20 September 2025 +0–0=1 +0.9
KNSB competitie 2025-2026 Klasse 1 ronde 8 Saturday 20 September 2025 +1–0=0 +7.0
KNSB competitie 2025-2026 KNSB Beker ronde 3 voor maart rating Saturday 20 September 2025 +0–1=0 -10.1
KNSB competitie 2025-2026 Klasse 1 ronde 7 Saturday 20 September 2025 +0–0=1 -1.5
KNSB competitie 2025-2026 KNSB Beker ronde 2 voor januari rating Saturday 20 September 2025 +1–0=0 +2.7
KNSB competitie 2025-2026 Klasse 1 ronde 5 Saturday 20 September 2025 +1–0=0 +2.9
KNSB competitie 2025-2026 Klasse 1 Ronde 4 Saturday 20 September 2025 +1–0=0 +11.9
KNSB competitie 2025-2026 Klasse 1 ronde 3 Saturday 20 September 2025 +0–0=1 +2.5
KNSB competitie 2025-2026 Klasse 1 ronde 2 Saturday 20 September 2025 +0–0=1 -2.5
KNSB competitie 2025-2026 Klasse 1 ronde 1 Saturday 20 September 2025 +1–0=0 +14.2
Oberliga NRW 2025-2026 September 2025 Sunday 14 September 2025 +0–1=0 -10.5
SOS competitie 2025/2026 Lijst 1 juni Monday 1 September 2025 +1–0=0 +9.6
NHSB-competitie 2025-2026 Topklasse t/m 19-04-2026 Monday 1 September 2025 +0–0=1 -5.1
NHSB-competitie 2025-2026 Topklasse t/m 05-04-2026 Monday 1 September 2025 +0–0=1 -3.6
SOS competitie 2025/2026 Lijst 1 apr Monday 1 September 2025 +0–1=0 -5.7
NHSB-competitie 2025-2026 Topklasse t/m 15-03-2026 Monday 1 September 2025 +1–0=0 +1.3
SOS competitie 2025/2026 Lijst 1 mrt Monday 1 September 2025 +0–0=1 -3.0
NHSB-competitie 2025-2026 Topklasse t/m 18-01-2026 Monday 1 September 2025 +1–0=0 +3.4
SOS competitie 2025/2026 Lijst 1 jan Monday 1 September 2025 +0–0=1 +2.2
SOS competitie 2025/2026 Lijst 1 Dec Monday 1 September 2025 +0–0=1 +5.5
NHSB-competitie 2025-2026 Topklasse t/m 05-10-2025 Monday 1 September 2025 +0–0=1 +1.4
SOS competitie 2025/2026 Lijst 1 Nov Monday 1 September 2025 +1–0=0 +5.7
Open NK Schaken 2025 Vierkampen Tuesday 22 July 2025 +2–0=1 +18.5
Oberliga NRW 2024-2025 Mai 2025 Saturday 3 May 2025 +0–0=2 +2.2
grenke Chess Open 2025 A-Open Thursday 17 April 2025 +1–1=6 -24.8
Oberliga NRW 2024-2025 April 2025 Saturday 5 April 2025 +0–0=1 +2.0
84e Noteboomtoernooi Groep A Friday 21 February 2025 +3–1=1 +13.9
Oberliga NRW 2024-2025 Februar 2025 Saturday 8 February 2025 +1–0=1 +13.6
26. NordWest-Cup A-Turnier Thursday 30 January 2025 +2–2=3 -22.1
OSBO Cup 2024-2025 mei 2025 Sunday 1 December 2024 +1–0=1 +5.7
Oberliga NRW 2024-2025 Dezember 2024 Sunday 1 December 2024 +0–2=0 -18.5
7. Sparkassen Schach Open Leer A-Open Thursday 31 October 2024 +3–1=3 -5.6
XXI Calvia Chess Festival 2024 - Amateur Open U2350 Saturday 5 October 2024 +5–2=2 +3.9
KNSB competitie 2024-2025 Klasse 1 ronde 8 Saturday 21 September 2024 +1–0=0 +8.2
KNSB competitie 2024-2025 Klasse 1 ronde 7 Saturday 21 September 2024 +0–1=0 -13.3
KNSB competitie 2024-2025 KNSB Beker ronde 3 voor aprillijst Saturday 21 September 2024 +0–0=1 -1.4
KNSB competitie 2024-2025 KNSB Beker ronde 2 voor januarilijst Saturday 21 September 2024 +1–0=0 +10.7
KNSB competitie 2024-2025 Klasse 1 ronde 5 Saturday 21 September 2024 +0–1=0 -6.8
KNSB competitie 2024-2025 Klasse 1 ronde 4 Saturday 21 September 2024 +1–0=0 +10.3
KNSB competitie 2024-2025 Klasse 1 ronde 3 Saturday 21 September 2024 +0–1=0 -10.2
KNSB competitie 2024-2025 Klasse 1 ronde 1 Saturday 21 September 2024 +1–0=0 +5.6
Oberliga NRW 2024-2025 September 2024 Sunday 15 September 2024 +0–0=1 +1.8
SOS Competitie 2024/2025 2025-05 Sunday 1 September 2024 +0–0=1 -7.7
NHSB-competitie 2024-2025 Topklasse t/m 27-04-2025 Sunday 1 September 2024 +1–0=0 +6.7
SOS Competitie 2024/2025 2025-04 Sunday 1 September 2024 +1–0=0 +5.4
NHSB-competitie 2024-2025 Topklasse t/m 06-04-2025 Sunday 1 September 2024 +1–0=0 +4.9
NHSB-competitie 2024-2025 Topklasse t/m 16-03-2025 Sunday 1 September 2024 +0–0=1 -2.5
NHSB-competitie 2024-2025 Topklasse t/m 16-02-2025 Sunday 1 September 2024 +0–0=1 +0.9
SOS Competitie 2024/2025 2025-02 Sunday 1 September 2024 +1–0=0 +3.7
NHSB-competitie 2024-2025 Topklasse t/m 12-01-2025 Sunday 1 September 2024 +0–0=1 -5.8
Interne competitie Caïssa-Eenhoorn 2024-2025 2024-12-17 Sunday 1 September 2024 +1–0=0 +1.3
NHSB-competitie 2024-2025 Topklasse t/m 08-12-2024 Sunday 1 September 2024 +0–1=0 -10.0
NHSB-competitie 2024-2025 Topklasse t/m 28-11-2024 Sunday 1 September 2024 +1–0=0 +4.3
Interne competitie Caïssa-Eenhoorn 2024-2025 T/m november Sunday 1 September 2024 +0–0=1 +3.2
NHSB-competitie 2024-2025 Topklasse t/m 26-10-2024 Sunday 1 September 2024 +0–0=1 +1.4
Snelschaak Teams (tijdens NK 2024) Saturday 13 July 2024 +4–8=3 -57.8
Budapest Spring Festival 2024 Group A Thursday 23 May 2024 +3–4=2 -11.4
Oberliga NRW 2023-2024 April 2024 Sunday 7 April 2024 +2–0=0 +14.5
GRENKE Chess Open 2024 A-Open Thursday 28 March 2024 +3–3=2 -18.5
Oberliga NRW 2023-2024 March 2024 Sunday 10 March 2024 +0–0=1 +0.3
Oberliga NRW 2023-2024 February 2024 Sunday 18 February 2024 +0–0=1 +0.7
Oberliga NRW 2023-2024 January 2024 Sunday 28 January 2024 +0–1=0 -4.6
20e Open de Vandoeuvre 2024 - Tournoi A (plus de 1900 elo) Wednesday 3 January 2024 +4–4=1 +6.6
Rilton Cup 2023-2024 Wednesday 27 December 2023 +1–1=3 +19.7
Oberliga NRW 2023-2024 November 2023 Sunday 19 November 2023 +1–0=0 +13.9
OSBO Cup 2023/2024 Kwartfinales ex SMB en Rhenen Wednesday 1 November 2023 +0–1=0 -7.2
6. Sparkassen-Schach-Open Leer A-Open Saturday 28 October 2023 +2–2=3 -26.2
XX Open Internacional Amateur de Calvia Saturday 7 October 2023 +6–1=2 +25.2
KNSB competitie 2023-2024 Klasse 1 ronde 9 Saturday 16 September 2023 +0–1=0 -5.0
KNSB competitie 2023-2024 Klasse 1 ronde 8 Saturday 16 September 2023 +1–0=0 +6.5
KNSB competitie 2023-2024 Klasse 1 ronde 7 Saturday 16 September 2023 +0–1=0 -9.6
KNSB competitie 2023-2024 Klasse 1 ronde 6 Saturday 16 September 2023 +0–1=0 -9.5
KNSB competitie 2023-2024 Klasse 1 ronde 5 Saturday 16 September 2023 +0–1=0 -8.9
KNSB competitie 2023-2024 KNSB Beker 2023-2024 voor decemberlijst Saturday 16 September 2023 +0–0=1 -4.3
KNSB competitie 2023-2024 Klasse 1 ronde 4 Saturday 16 September 2023 +0–0=1 -5.0
KNSB competitie 2023-2024 Klasse 1 ronde 3 Saturday 16 September 2023 +0–0=1 +7.7
KNSB competitie 2023-2024 Klasse 1 ronde 1 Saturday 16 September 2023 +1–0=0 +8.8
Oberliga NRW 2023-2024 September 2023 Sunday 3 September 2023 +1–1=0 +6.7
SOS Competitie 2023/2024 Mei 2024 Friday 1 September 2023 +0–0=1 -3.4
NHSB-competitie 2023-2024 Topklasse t/m 25-04-2024 Friday 1 September 2023 +0–0=1 -5.7
SOS Competitie 2023/2024 April 2024 Friday 1 September 2023 +1–0=0 +3.2
NHSB-competitie 2023-2024 Topklasse t/m 27-03-2024 Friday 1 September 2023 +0–1=0 -10.2
SOS Competitie 2023/2024 Maart 2024 Friday 1 September 2023 +1–0=0 +3.7
NHSB-competitie 2023-2024 Topklasse t/m 23-02-2024 Friday 1 September 2023 +1–0=0 +9.7
SOS Competitie 2023/2024 Januari 2024 Friday 1 September 2023 +1–0=0 +2.3
SOS Competitie 2023/2024 September 2023 Friday 1 September 2023 +0–0=1 +3.4
Brugse Meesters 2023 Open - Belgian Championship 2023 Open A Saturday 12 August 2023 +5–2=2 +18.4
CZECH OPEN 2023 - A Friday 21 July 2023 +1–2=4 -41.6
82e Noteboomtoernooi Groep A Friday 24 February 2023 +2–2=1 -16.6
XXXIII Miedzynarodowy Festiwal Szachowy CRACOVIA 2022 Grupa A Tuesday 27 December 2022 +2–4=3 -4.1
OSBO Cup 2022/2023 Groep A Tuesday 6 December 2022 +0–1=0 -11.8
Elllobregat Open Chess 2022 Group A Wednesday 30 November 2022 +3–5=1 +3.8
5. Schach Open Leer - A Open Friday 28 October 2022 +3–2=2 +10.2
KNSB competitie 2022-2023 Klasse 1 ronde 9 Saturday 17 September 2022 +1–0=0 +11.3
KNSB competitie 2022-2023 Beker ronde 5 Saturday 17 September 2022 +0–0=1 +2.4
KNSB competitie 2022-2023 Klasse 1 ronde 8 Saturday 17 September 2022 +0–0=1 -1.0
KNSB competitie 2022-2023 Beker ronde 4 Saturday 17 September 2022 +1–0=0 +2.9
KNSB competitie 2022-2023 Klasse 1 ronde 7 Saturday 17 September 2022 +0–1=0 -5.6
KNSB competitie 2022-2023 Klasse 1 ronde 6 Saturday 17 September 2022 +0–1=0 -8.4
KNSB competitie 2022-2023 Beker ronde 3 Saturday 17 September 2022 +0–1=0 -9.0
KNSB competitie 2022-2023 Klasse 1 ronde 5 Saturday 17 September 2022 +0–1=0 -9.8
KNSB competitie 2022-2023 Klasse 1 ronde 4 Saturday 17 September 2022 +0–1=0 -13.0
SOS Competitie 2022/2023 Mei Monday 12 September 2022 +0–0=1 -4.0
SOS Competitie 2022/2023 Februari 2023 Monday 12 September 2022 +0–0=1 +2.8

Rating History

Loading rating history...

Peak Ratings

Classic 2229 March 1, 2024
Rapid 2144 June 1, 2025
Blitz 2183 Feb. 1, 2025

Games

Wins 129
Losses 98
Draws 126
Win Rate 37%

Performance by Color

Color Wins Draws Losses Win Rate
White 76 67 45 40%
Black 53 59 53 32%

Recent Matches

Ludden, G.J. (Gert-Jan) (2195) Friday 8 May 2026 WIN +9.6
GM Dgebuadze, A. (Alexandre) (2381) Sunday 19 April 2026 LOSS -5.5
Brink van den, J.H. (Johan) (2013) Tuesday 14 April 2026 DRAW -5.1
Hauwert, N.C.F. (Nico) (2085) Tuesday 31 March 2026 DRAW -3.6
Noordenbos, D. (Daan) (2199) Saturday 28 March 2026 LOSS -10.1
FM Wolter, Kai, Dr. (2185) Sunday 22 March 2026 DRAW -1.1
IM Illner, A. (Achim) (2424) Saturday 21 March 2026 DRAW +4.8
Block de, Y. (Yordi) (2072) Sunday 15 March 2026 DRAW -3.9
Sinev, A. (Anton) (2262) Sunday 15 March 2026 DRAW +0.9
IM Kroeze, F.M. (Frank) (2373) Friday 13 March 2026 LOSS -5.7
Meems, C. (Cornelis) (1804) Tuesday 10 March 2026 WIN +1.3
Croese, C. (Cor) (2136) Saturday 7 March 2026 WIN +7.0
FM Slagboom, L. (Leandro) (2357) Sunday 1 March 2026 LOSS -6.1
Elburg van der, F. (Freddie) (2246) Wednesday 11 February 2026 DRAW +0.5
FM Kazarjan, G. (Gachatur) (2251) Sunday 8 February 2026 DRAW +0.7
Eijk van der, M. (Martijn) (2198) Sunday 8 February 2026 LOSS -10.1
Weggen, J.V. (Jeroen) (2170) Saturday 7 February 2026 DRAW -1.5
Frederiks, J. (Jesse) (2109) Thursday 5 February 2026 DRAW -3.0
Scheider, Julian (2282) Sunday 18 January 2026 WIN +11.6
IM Gaponenko, I. (Inna) (2323) Saturday 17 January 2026 DRAW +3.0