KNSB FIDE
JZ

Jason Zondag

Rated since January 2023

1981 Classic
1970 Rapid
1957 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
LIEFRINK, F. (FEIKE) 2041
12667 RSB Competitie 2025-2026 Achtallen december · Friday 28 November 2025
EVELEENS, W. (WIM) 1976
10470 Tata Steel Chess Tournament 2026 Tienkampen · Friday 30 January 2026
CUBUK, A. (ARMIN) 1957
13747 Amsterdam Chess Festival Weekendvierkampen 2026 Groep A · Saturday 18 July 2026
ZEEMAN, G. (GOSWIN) 1948
14160 Open NK Schaken 2026 Vierkampen · Tuesday 28 July 2026
PIEL, R.J. (RUBEN) 1937
10470 Tata Steel Chess Tournament 2026 Tienkampen · Tuesday 27 January 2026
Worst losses
KUDERNAC, T. (THEO) 1937
10470 Tata Steel Chess Tournament 2026 Tienkampen · Monday 26 January 2026
EVENGROEN, B.A. (BERNARD) 1937
12592 KNSB competitie 2025-2026 Klasse 3 ronde 5 · Saturday 13 December 2025
GROOT, R.G.D. (RONALD) 1968
13747 Amsterdam Chess Festival Weekendvierkampen 2026 Groep A · Sunday 19 July 2026
VIJVER, J. (JONATHAN) 1981
10470 Tata Steel Chess Tournament 2026 Tienkampen · Wednesday 28 January 2026
OUDVORST VAN, G.J. (BERT) 1994
10470 Tata Steel Chess Tournament 2026 Tienkampen · Sunday 1 February 2026
Tata Steel Chess Tournament 2026 Tienkampen Friday 16 January 2026 +2–4=3 -25.4
KNSB competitie 2026-2027 Klasse 4 ronde 1 Saturday 19 September 2026 +0–0=1 +1.2
Open NK Schaken 2026 Vierkampen Tuesday 21 July 2026 +1–0=2 +11.7
Amsterdam Chess Festival Weekendvierkampen 2026 Groep A Friday 17 July 2026 +2–1=0 +11.1
KNSB competitie 2025-2026 Klasse 3 ronde 6 Saturday 20 September 2025 +0–1=0 -10.3
KNSB competitie 2025-2026 Klasse 3 ronde 8 Saturday 20 September 2025 +0–0=1 +5.3
KNSB competitie 2025-2026 Klasse 3 ronde 7 Saturday 20 September 2025 +1–0=0 +10.5
KNSB competitie 2025-2026 Klasse 3 ronde 5 Saturday 20 September 2025 +0–1=0 -13.9
KNSB competitie 2025-2026 Klasse 3 Ronde 4 Saturday 20 September 2025 +0–0=1 +1.1
KNSB competitie 2025-2026 Klasse 3 ronde 3 Saturday 20 September 2025 +0–1=0 -8.5
RSB Competitie 2025-2026 Achtallen december Monday 1 September 2025 +1–0=0 +14.4
RSB Competitie 2025-2026 Beker ronde 1 Monday 1 September 2025 +0–0=1 -2.4

Team Competition

Current teams
RSR Ivoren Toren 1
Klasse 3E · 2025-2026 · 8 games
RSR Ivoren Toren 2
Klasse 1B · 2025-2026 · 1 game
Past teams
RSR Ivoren Toren 2
Klasse 4E · 2024-2025
RSR Ivoren Toren 1
Hoofdklasse · 2023-2024
RSR Ivoren Toren 2
Klasse 4F · 2023-2024
RSR Ivoren Toren 1
Hoofdklasse · 2022-2023
RSR Ivoren Toren 2
Klasse 5H · 2022-2023
RSR Ivoren Toren 1
Klasse 3F · 2021-2022
RSR Ivoren Toren 1
Hoofdklasse · 2021-2022

Rating History

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Peak Ratings

Classic 2001 March 1, 2025
Rapid 1970 Nov. 1, 2025
Blitz 1962 March 1, 2026

Games

Wins 7
Losses 8
Draws 9
Win Rate 29%

Performance by Color

Color Wins Draws Losses Win Rate
White 5 2 3 50%
Black 2 7 5 14%

Recent Matches

Peleman, T. (Tony) (2015) Saturday 19 September 2026 DRAW +1.2
Krosenbrink, M. (Marcel) (1948) Wednesday 29 July 2026 DRAW -0.3
Zeeman, G. (Goswin) (1948) Tuesday 28 July 2026 WIN +12.2
Doel van den, F.W.T. (Floris) (1951) Monday 27 July 2026 DRAW -0.2
Groot, R.G.D. (Ronald) (1968) Sunday 19 July 2026 LOSS -12.1
Cubuk, A. (Armin) (1957) Saturday 18 July 2026 WIN +12.5
Pilgrim, P.Q.T. (Peter) (1905) Friday 17 July 2026 WIN +10.7
Both, A. (Bert) (2025) Saturday 28 March 2026 LOSS -10.3
Ouden van den, L.J.F. (Lendert) (2121) Saturday 7 March 2026 DRAW +5.3
Braak van de, J. (Joey) (1920) Saturday 7 February 2026 WIN +10.5
Oudvorst van, G.J. (Bert) (1994) Sunday 1 February 2026 LOSS -11.9
Vries de, E. (Emma) (1938) Saturday 31 January 2026 DRAW -1.4
Eveleens, W. (Wim) (1976) Friday 30 January 2026 WIN +12.5
Vijver, J. (Jonathan) (1981) Wednesday 28 January 2026 LOSS -12.4
Piel, R.J. (Ruben) (1937) Tuesday 27 January 2026 WIN +11.1
Kudernac, T. (Theo) (1937) Monday 26 January 2026 LOSS -13.9
Ree van, T.K.P.C. (Thailo) (1968) Sunday 25 January 2026 DRAW -0.3
Morera Roda, Lucas (2033) Saturday 24 January 2026 LOSS -10.6
Limbach, T. (Torsten) (2018) Friday 23 January 2026 DRAW +1.4
Evengroen, B.A. (Bernard) (1937) Saturday 13 December 2025 LOSS -13.9