KNSB FIDE
BB

Bas de Boer

Rated since January 2023

2221 Classic
2144 Rapid

RIVALRY

Nemesis
Kollen, Z. (Zyon)
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 · 2024-08-11
KOLLEN, Z. (ZYON) (FM) 2369
Belgian Interclubs Round 2025-2026 Ronde 2 · 2025-10-12
YU, JIANGWEI 2357
20e Open de Vandoeuvre 2024 - Tournoi A (plus de 1900 elo) · 2024-01-04
PHAM, K.V. (KHOI) (IM) 2341
6573 15e BPB Limburg Open 2023 Groep A · 2023-05-26
CZERNEK, TYMON (FM) 2324
Rilton Cup 2023-2024 · 2023-12-30
Worst losses
BENIOSEV, DANIEL (CM) 1728
Riga Technical University Open 2024 - Tournament A · 2024-08-05
LHOTSKA, ANNA (WFM) 1950
CZECH OPEN 2023 - A · 2023-07-21
VALKENBURG, M. (MAX) 1957
Snelschaak Teams (tijdens NK 2024) · 2024-07-13
GOLDMANN, DAVID 1969
GRENKE Chess Open 2024 A-Open · 2024-04-01
MON DE, G. (GINO) 2005
Snelschaak Teams (tijdens NK 2024) · 2024-07-13
Belgian Interclubs Round 2025-2026 Ronde 7 Sun, Feb 8, 2026 +0–0=1 +0.7
Belgian Interclubs Round 2025-2026 Ronde 5 Sun, Dec 7, 2025 +0–0=1 +1.7
Belgian Interclubs Round 2025-2026 Ronde 4 Sun, Nov 23, 2025 +1–0=0 +7.6
Belgian Interclubs Round 2025-2026 Ronde 3 Sun, Nov 16, 2025 +0–0=1 +2.8
Belgian Interclubs Round 2025-2026 Ronde 2 Sun, Oct 12, 2025 +1–0=0 +16.3
17e BPB Limburg Open 2025 Groep A Fri, Jun 6, 2025 +2–3=2 +0.6
Open Dordrecht Rapidtoernooi Groep A Sat, Mar 1, 2025 +3–1=3 -16.5
Tata Steel Chess Tournament 2025 Weekendvierkampen Fri, Jan 17, 2025 +0–1=2 -8.4
OSBO Snelschaakkampioenschap 2025 Voorrondes Sat, Jan 4, 2025 +6–1=2 +32.8
OSBO Snelschaakkampioenschap 2025 Finale A Sat, Jan 4, 2025 +6–8=2 +36.5
Chess Festival Groningen Open A Sat, Dec 21, 2024 +2–2=5 +11.3
39th European Club Cup Sun, Oct 20, 2024 +3–3=1 -16.0
Riga Technical University Open 2024 - Tournament A Mon, Aug 5, 2024 +5–3=1 -9.6
HSG Open 2024 Groep A Fri, Jun 21, 2024 +1–0=5 -4.8
16e BPB Limburg Open 2024 Groep A Fri, May 17, 2024 +2–1=2 -3.6
Tata Steel Chess Tournament 2024 Weekendvierkampen Fri, Jan 12, 2024 +1–0=2 +14.3
HSG Open 2023 Groep A Fri, Jun 23, 2023 +2–1=3 -12.8
15e BPB Limburg Open 2023 Groep A Fri, May 26, 2023 +2–1=4 +25.5
Tata Steel Chess Tournament 2023 Weekendvierkampen Fri, Jan 13, 2023 +3–0=0 +20.8
Oberliga NRW 2025-2026 Januar 2026 Sat, Jan 17, 2026 +2–0=2 +29.2
OSBO-Cup 2025/2026 Februari 2026 Mon, Dec 1, 2025 +0–0=2 +1.0
Oberliga NRW 2025-2026 November 2025 Sat, Nov 8, 2025 +0–0=2 +0.1
Oberliga NRW 2025-2026 Oktober 2025 Sat, Oct 4, 2025 +0–0=1 -0.3
Belgian Interclubs Round 2025-2026 Ronde 1 Sun, Sep 28, 2025 +0–0=1 +2.5
KNSB competitie 2025-2026 Klasse 1 ronde 6 Sat, Sep 20, 2025 +0–1=0 -10.1
KNSB competitie 2025-2026 KNSB Beker ronde 4 Sat, Sep 20, 2025 +0–0=1 +0.9
KNSB competitie 2025-2026 Klasse 1 ronde 8 Sat, Sep 20, 2025 +1–0=0 +7.0
KNSB competitie 2025-2026 KNSB Beker ronde 3 voor maart rating Sat, Sep 20, 2025 +0–2=0 -20.2
KNSB competitie 2025-2026 Klasse 1 ronde 7 Sat, Sep 20, 2025 +0–0=2 -2.9
KNSB competitie 2025-2026 KNSB Beker ronde 2 voor januari rating Sat, Sep 20, 2025 +1–0=0 +2.7
KNSB competitie 2025-2026 Klasse 1 ronde 5 Sat, Sep 20, 2025 +1–0=0 +2.9
KNSB competitie 2025-2026 Klasse 1 Ronde 4 Sat, Sep 20, 2025 +1–0=0 +11.9
KNSB competitie 2025-2026 Klasse 1 ronde 3 Sat, Sep 20, 2025 +0–0=1 +2.5
KNSB competitie 2025-2026 Klasse 1 ronde 2 Sat, Sep 20, 2025 +0–0=1 -2.5
KNSB competitie 2025-2026 Klasse 1 ronde 1 Sat, Sep 20, 2025 +1–0=0 +14.2
Oberliga NRW 2025-2026 September 2025 Sun, Sep 14, 2025 +0–1=0 -10.5
SOS competitie 2025/2026 Lijst 1 apr Mon, Sep 1, 2025 +0–1=0 -5.7
NHSB-competitie 2025-2026 Topklasse t/m 15-03-2026 Mon, Sep 1, 2025 +1–0=0 +1.3
SOS competitie 2025/2026 Lijst 1 mrt Mon, Sep 1, 2025 +0–0=2 -5.9
NHSB-competitie 2025-2026 Topklasse t/m 18-01-2026 Mon, Sep 1, 2025 +1–0=0 +3.4
SOS competitie 2025/2026 Lijst 1 jan Mon, Sep 1, 2025 +0–0=1 +2.2
SOS competitie 2025/2026 Lijst 1 Dec Mon, Sep 1, 2025 +0–0=1 +5.5
NHSB-competitie 2025-2026 Topklasse t/m 05-10-2025 Mon, Sep 1, 2025 +0–0=1 +1.4
SOS competitie 2025/2026 Lijst 1 Nov Mon, Sep 1, 2025 +1–0=0 +5.7
Open NK Schaken 2025 Vierkampen Tue, Jul 22, 2025 +2–0=1 +18.5
Oberliga NRW 2024-2025 Mai 2025 Sat, May 3, 2025 +0–0=2 +2.2
grenke Chess Open 2025 A-Open Thu, Apr 17, 2025 +1–1=6 -24.8
Oberliga NRW 2024-2025 April 2025 Sat, Apr 5, 2025 +0–0=1 +2.0
84e Noteboomtoernooi Groep A Fri, Feb 21, 2025 +3–1=1 +13.9
Oberliga NRW 2024-2025 Februar 2025 Sat, Feb 8, 2025 +1–0=1 +13.6
26. NordWest-Cup A-Turnier Thu, Jan 30, 2025 +2–2=3 -22.1
OSBO Cup 2024-2025 mei 2025 Sun, Dec 1, 2024 +1–0=1 +5.7
Oberliga NRW 2024-2025 Dezember 2024 Sun, Dec 1, 2024 +0–2=0 -18.5
7. Sparkassen Schach Open Leer A-Open Thu, Oct 31, 2024 +3–1=3 -5.6
XXI Calvia Chess Festival 2024 - Amateur Open U2350 Sat, Oct 5, 2024 +5–2=2 +3.9
KNSB competitie 2024-2025 Klasse 1 ronde 8 Sat, Sep 21, 2024 +1–0=0 +8.2
KNSB competitie 2024-2025 Klasse 1 ronde 7 Sat, Sep 21, 2024 +0–1=0 -13.3
KNSB competitie 2024-2025 KNSB Beker ronde 3 voor aprillijst Sat, Sep 21, 2024 +0–0=1 -1.4
KNSB competitie 2024-2025 KNSB Beker ronde 2 voor januarilijst Sat, Sep 21, 2024 +1–0=0 +10.7
KNSB competitie 2024-2025 Klasse 1 ronde 5 Sat, Sep 21, 2024 +0–1=0 -6.8
KNSB competitie 2024-2025 Klasse 1 ronde 4 Sat, Sep 21, 2024 +1–0=0 +10.3
KNSB competitie 2024-2025 Klasse 1 ronde 3 Sat, Sep 21, 2024 +0–1=0 -10.2
KNSB competitie 2024-2025 Klasse 1 ronde 1 Sat, Sep 21, 2024 +1–0=0 +5.6
Oberliga NRW 2024-2025 September 2024 Sun, Sep 15, 2024 +0–0=1 +1.8
SOS Competitie 2024/2025 2025-05 Sun, Sep 1, 2024 +0–0=1 -7.7
NHSB-competitie 2024-2025 Topklasse t/m 27-04-2025 Sun, Sep 1, 2024 +1–0=0 +6.7
SOS Competitie 2024/2025 2025-04 Sun, Sep 1, 2024 +1–0=0 +5.4
NHSB-competitie 2024-2025 Topklasse t/m 06-04-2025 Sun, Sep 1, 2024 +1–0=0 +4.9
NHSB-competitie 2024-2025 Topklasse t/m 16-03-2025 Sun, Sep 1, 2024 +0–0=1 -2.5
NHSB-competitie 2024-2025 Topklasse t/m 16-02-2025 Sun, Sep 1, 2024 +0–0=1 +0.9
SOS Competitie 2024/2025 2025-02 Sun, Sep 1, 2024 +1–0=0 +3.7
NHSB-competitie 2024-2025 Topklasse t/m 12-01-2025 Sun, Sep 1, 2024 +0–0=1 -5.8
Interne competitie Caïssa-Eenhoorn 2024-2025 2024-12-17 Sun, Sep 1, 2024 +1–0=0 +1.3
NHSB-competitie 2024-2025 Topklasse t/m 08-12-2024 Sun, Sep 1, 2024 +0–1=0 -10.0
NHSB-competitie 2024-2025 Topklasse t/m 28-11-2024 Sun, Sep 1, 2024 +1–0=0 +4.3
Interne competitie Caïssa-Eenhoorn 2024-2025 T/m november Sun, Sep 1, 2024 +0–0=1 +3.2
NHSB-competitie 2024-2025 Topklasse t/m 26-10-2024 Sun, Sep 1, 2024 +0–0=1 +1.4
Snelschaak Teams (tijdens NK 2024) Sat, Jul 13, 2024 +4–9=3 -65.3
Budapest Spring Festival 2024 Group A Thu, May 23, 2024 +3–4=2 -11.4
Oberliga NRW 2023-2024 April 2024 Sun, Apr 7, 2024 +2–0=0 +14.5
GRENKE Chess Open 2024 A-Open Thu, Mar 28, 2024 +3–3=2 -18.5
Oberliga NRW 2023-2024 March 2024 Sun, Mar 10, 2024 +0–0=1 +0.3
Oberliga NRW 2023-2024 February 2024 Sun, Feb 18, 2024 +0–0=1 +0.7
Oberliga NRW 2023-2024 January 2024 Sun, Jan 28, 2024 +0–1=0 -4.6
20e Open de Vandoeuvre 2024 - Tournoi A (plus de 1900 elo) Wed, Jan 3, 2024 +4–4=1 +6.6
Rilton Cup 2023-2024 Wed, Dec 27, 2023 +1–1=3 +19.7
Oberliga NRW 2023-2024 November 2023 Sun, Nov 19, 2023 +1–0=0 +13.9
OSBO Cup 2023/2024 Kwartfinales ex SMB en Rhenen Wed, Nov 1, 2023 +0–1=0 -7.2
6. Sparkassen-Schach-Open Leer A-Open Sat, Oct 28, 2023 +2–2=3 -26.2
XX Open Internacional Amateur de Calvia Sat, Oct 7, 2023 +6–1=2 +25.2
KNSB competitie 2023-2024 Klasse 1 ronde 9 Sat, Sep 16, 2023 +0–1=0 -5.0
KNSB competitie 2023-2024 Klasse 1 ronde 8 Sat, Sep 16, 2023 +1–0=0 +6.5
KNSB competitie 2023-2024 Klasse 1 ronde 7 Sat, Sep 16, 2023 +0–1=0 -9.6
KNSB competitie 2023-2024 Klasse 1 ronde 6 Sat, Sep 16, 2023 +0–1=0 -9.5
KNSB competitie 2023-2024 Klasse 1 ronde 5 Sat, Sep 16, 2023 +0–1=0 -8.9
KNSB competitie 2023-2024 KNSB Beker 2023-2024 voor decemberlijst Sat, Sep 16, 2023 +0–0=1 -4.3
KNSB competitie 2023-2024 Klasse 1 ronde 4 Sat, Sep 16, 2023 +0–0=1 -5.0
KNSB competitie 2023-2024 Klasse 1 ronde 3 Sat, Sep 16, 2023 +0–0=1 +7.7
KNSB competitie 2023-2024 Klasse 1 ronde 1 Sat, Sep 16, 2023 +1–0=0 +8.8
Oberliga NRW 2023-2024 September 2023 Sun, Sep 3, 2023 +1–1=0 +6.7
SOS Competitie 2023/2024 Mei 2024 Fri, Sep 1, 2023 +0–0=1 -3.4
NHSB-competitie 2023-2024 Topklasse t/m 25-04-2024 Fri, Sep 1, 2023 +0–0=1 -5.7
SOS Competitie 2023/2024 April 2024 Fri, Sep 1, 2023 +1–0=0 +3.2
NHSB-competitie 2023-2024 Topklasse t/m 27-03-2024 Fri, Sep 1, 2023 +0–1=0 -10.2
SOS Competitie 2023/2024 Maart 2024 Fri, Sep 1, 2023 +1–0=0 +3.7
NHSB-competitie 2023-2024 Topklasse t/m 23-02-2024 Fri, Sep 1, 2023 +1–0=0 +9.7
SOS Competitie 2023/2024 Januari 2024 Fri, Sep 1, 2023 +1–0=0 +2.3
SOS Competitie 2023/2024 September 2023 Fri, Sep 1, 2023 +0–0=1 +3.4
Brugse Meesters 2023 Open - Belgian Championship 2023 Open A Sat, Aug 12, 2023 +5–2=2 +18.4
CZECH OPEN 2023 - A Fri, Jul 21, 2023 +1–2=4 -41.6
82e Noteboomtoernooi Groep A Fri, Feb 24, 2023 +2–2=1 -16.6
XXXIII Miedzynarodowy Festiwal Szachowy CRACOVIA 2022 Grupa A Tue, Dec 27, 2022 +2–4=3 -4.1
OSBO Cup 2022/2023 Groep A Tue, Dec 6, 2022 +0–1=0 -11.8
Elllobregat Open Chess 2022 Group A Wed, Nov 30, 2022 +3–5=1 +3.8
5. Schach Open Leer - A Open Fri, Oct 28, 2022 +3–2=2 +10.2
KNSB competitie 2022-2023 Klasse 1 ronde 9 Sat, Sep 17, 2022 +1–0=0 +11.3
KNSB competitie 2022-2023 Beker ronde 5 Sat, Sep 17, 2022 +0–0=1 +2.4
KNSB competitie 2022-2023 Klasse 1 ronde 8 Sat, Sep 17, 2022 +0–0=1 -1.0
KNSB competitie 2022-2023 Beker ronde 4 Sat, Sep 17, 2022 +1–0=0 +2.9
KNSB competitie 2022-2023 Klasse 1 ronde 7 Sat, Sep 17, 2022 +0–1=0 -5.6
KNSB competitie 2022-2023 Klasse 1 ronde 6 Sat, Sep 17, 2022 +0–1=0 -8.4
KNSB competitie 2022-2023 Beker ronde 3 Sat, Sep 17, 2022 +0–1=0 -9.0
KNSB competitie 2022-2023 Klasse 1 ronde 5 Sat, Sep 17, 2022 +0–1=0 -9.8
KNSB competitie 2022-2023 Klasse 1 ronde 4 Sat, Sep 17, 2022 +0–1=0 -13.0
SOS Competitie 2022/2023 Mei Mon, Sep 12, 2022 +0–0=1 -4.0
SOS Competitie 2022/2023 Februari 2023 Mon, Sep 12, 2022 +0–0=1 +2.8

Rating History

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Peak Ratings

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

Games

Wins 129
Losses 98
Draws 125
Win Rate 37%

Performance by Color

Color Wins Draws Losses Win Rate
White 76 66 44 41%
Black 53 59 54 32%

Recent Matches

Noordenbos, D. (Daan) (2199) 2026-03-28 LOSS -10.1
Sinev, A. (Anton) (2262) 2026-03-15 DRAW +0.9
IM Kroeze, F.M. (Frank) (2373) 2026-03-13 LOSS -5.7
Meems, C. (Cornelis) (1804) 2026-03-10 WIN +1.3
Croese, C. (Cor) (2136) 2026-03-07 WIN +7.0
Elburg van der, F. (Freddie) (2246) 2026-02-11 DRAW +0.5
Elburg van der, F. (Freddie) (2246) 2026-02-11 DRAW +0.5
FM Kazarjan, G. (Gachatur) (2251) 2026-02-08 DRAW +0.7
Eijk van der, M. (Martijn) (2198) 2026-02-08 LOSS -10.1
Eijk van der, M. (Martijn) (2198) 2026-02-08 LOSS -10.1
Weggen, J.V. (Jeroen) (2170) 2026-02-07 DRAW -1.5
Weggen, J.V. (Jeroen) (2170) 2026-02-07 DRAW -1.5
Frederiks, J. (Jesse) (2109) 2026-02-05 DRAW -3.0
Frederiks, J. (Jesse) (2109) 2026-02-05 DRAW -3.0
Scheider, Julian (2282) 2026-01-18 WIN +11.6
Scheider, Julian (2282) 2026-01-18 WIN +11.6
IM Gaponenko, I. (Inna) (2323) 2026-01-17 DRAW +3.0
IM Gaponenko, I. (Inna) (2323) 2026-01-17 DRAW +3.0
Galje, H. (Hans) (1945) 2026-01-13 WIN +3.4
Smit, R.T.F. (Robin) (1888) 2025-12-14 WIN +2.7