KNSB FIDE
JW

Jacob Wiersma

Rated since January 2023

1566 Classic
1566 Rapid
1566 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
KRAAN VAN DER, L. (LENNART) 1653
12813 NHSB-competitie 2025-2026 Viertallen F t/m 18-01-2026 · Tuesday 13 January 2026
NIGTEN, R. (RICHARD) 1635
10987 NHSB-competitie 2024-2025 Viertallen F t/m 06-04-2025 · Monday 31 March 2025
GNANASEKARAN, K. (KEERTHI) 1559
12595 KNSB competitie 2025-2026 Klasse 6 ronde 4 · Saturday 13 December 2025
LEEST VAN DER, A. (ALEX) 1476
9717 NHSB-competitie 2024-2025 Klasse 3C t/m 26-10-2024 · Friday 18 October 2024
Worst losses
SIEWERTSEN, K. (KLAAS) 1315
Amsterdam Science Park 2023 Weekendvierkampen · Friday 21 July 2023
WAERSEGERS, E.G. (EDWARD) 1321
Amsterdam Science Park 2023 Weekendvierkampen · Sunday 23 July 2023
VISSCHER, R. (ROBBERT) 1338
Amsterdam Science Park 2023 Weekendvierkampen · Saturday 22 July 2023
OOSTENBRUG, E. (ED) 1499
6969 KNSB competitie 2022-2023 Klasse 6 ronde 7 · Saturday 1 April 2023
YUNG, A.L.H. (AERON) 1556
6558 KNSB competitie 2022-2023 Klasse 6 ronde 5 · Saturday 11 February 2023
No FIDE-rated tournaments found.
KNSB competitie 2025-2026 Klasse 6 ronde 5 Saturday 20 September 2025 +0–1=0 -7.6
KNSB competitie 2025-2026 Klasse 6 ronde 6 Saturday 20 September 2025 +0–0=1
KNSB competitie 2025-2026 Klasse 6 ronde 4 Saturday 20 September 2025 +1–0=0 +12.1
KNSB competitie 2025-2026 Klasse 6 Ronde 3 Saturday 20 September 2025 +0–1=0 -7.5
KNSB competitie 2025-2026 Klasse 6 ronde 2 Saturday 20 September 2025 +0–0=1 +7.9
NHSB-competitie 2025-2026 Brons t/m 29-03-2026 Monday 1 September 2025 +0–1=0 -7.5
NHSB-competitie 2025-2026 Brons t/m 01-03-2026 Monday 1 September 2025 +0–1=0 -7.2
NHSB-competitie 2025-2026 Viertallen F t/m 18-01-2026 Monday 1 September 2025 +1–0=0 +15.3
NHSB-competitie 2025-2026 Viertallen F t/m 07-12-2025 Monday 1 September 2025 +0–1=0 -9.8
NHSB-competitie 2025-2026 Klasse 2B t/m 23-11-2025 Monday 1 September 2025 +0–1=0 -2.9
NHSB-competitie 2025-2026 Klasse 2B t/m 02-11-2025 Monday 1 September 2025 +0–0=1 +6.2
KNSB competitie 2024-2025 Klasse 6 ronde 7 Saturday 21 September 2024 +0–1=0 -7.1
KNSB competitie 2024-2025 Klasse 6 ronde 6 Saturday 21 September 2024 +0–1=0 -9.1
KNSB competitie 2024-2025 Klasse 6 ronde 5 Saturday 21 September 2024 +0–0=1 -1.8
KNSB competitie 2024-2025 Klasse 6 ronde 4 Saturday 21 September 2024 +0–0=1
KNSB competitie 2024-2025 Klasse 6 ronde 2 Saturday 21 September 2024 +0–0=1 -2.0
KNSB competitie 2024-2025 Klasse 6 ronde 1 Saturday 21 September 2024 +0–0=1 +0.4
NHSB-competitie 2024-2025 Klasse 3C t/m 13-04-2025 Sunday 1 September 2024 +0–1=0 -9.9
NHSB-competitie 2024-2025 Viertallen F t/m 06-04-2025 Sunday 1 September 2024 +1–0=0 +14.4
NHSB-competitie 2024-2025 Brons t/m 19-01-2025 Sunday 1 September 2024 +0–1=0 -6.1
NHSB-competitie 2024-2025 Viertallen F t/m 19-01-2025 Sunday 1 September 2024 +0–1=0
NHSB-competitie 2024-2025 Viertallen F t/m 08-12-2024 Sunday 1 September 2024 +0–1=0 -5.0
NHSB-competitie 2024-2025 Klasse 3C t/m 26-10-2024 Sunday 1 September 2024 +1–0=0 +8.8
KNSB competitie 2023-2024 Klasse 6 ronde 7 Saturday 16 September 2023 +1–0=0
KNSB competitie 2023-2024 Klasse 6 ronde 6 Saturday 16 September 2023 +0–1=0
KNSB competitie 2023-2024 Klasse 6 ronde 5 Saturday 16 September 2023 +0–1=0 -2.4
KNSB competitie 2023-2024 Klasse 6 ronde 4 Saturday 16 September 2023 +0–1=0 -2.7
KNSB competitie 2023-2024 Klasse 6 ronde 3 Saturday 16 September 2023 +0–1=0
KNSB competitie 2023-2024 Klasse 6 ronde 2 Saturday 16 September 2023 +0–1=0
KNSB competitie 2023-2024 Klasse 6 ronde 1 Saturday 16 September 2023 +0–0=1 +10.8
Amsterdam Science Park 2023 Weekendvierkampen Friday 21 July 2023 +0–3=0 -39.3
KNSB competitie 2022-2023 Klasse 6 ronde 7 Saturday 17 September 2022 +0–1=0 -7.5
KNSB competitie 2022-2023 Klasse 6 ronde 6 Saturday 17 September 2022 +0–1=0 -5.4
KNSB competitie 2022-2023 Klasse 6 ronde 5 Saturday 17 September 2022 +0–1=0 -6.2
KNSB competitie 2022-2023 Klasse 6 ronde 4 Saturday 17 September 2022 +0–1=0 -5.8
KNSB competitie 2022-2023 Klasse 6 ronde 3 Saturday 17 September 2022 +0–1=0

Rating History

Loading rating history...

Peak Ratings

Classic 1594 Nov. 1, 2024
Rapid 1588 March 1, 2026
Blitz 1588 March 1, 2026

Games

Wins 5
Losses 25
Draws 8
Win Rate 13%

Performance by Color

Color Wins Draws Losses Win Rate
White 1 4 14 5%
Black 4 4 11 21%

Recent Matches

Vesters, T. (Timo) (1736) Saturday 28 March 2026 LOSS -7.6
Veen van, B. (Bart) (1738) Friday 27 March 2026 LOSS -7.5
Roijers, D. (Dennis) (1747) Friday 27 February 2026 LOSS -7.2
Mantel, M.W.D.M. (Marc) Saturday 7 February 2026 DRAW
Kraan van der, L. (Lennart) (1653) Tuesday 13 January 2026 WIN +15.3
Gnanasekaran, K. (Keerthi) (1559) Saturday 13 December 2025 WIN +12.1
Haan, H. (Hessel) (1649) Monday 1 December 2025 LOSS -9.8
Knegt de, J. (Jaap) (1718) Saturday 22 November 2025 LOSS -7.5
Graaf, J. (Jeroen) (1909) Friday 21 November 2025 LOSS -2.9
Nieland, G.W.H. (Wim) (1826) Saturday 1 November 2025 DRAW +7.9
Doevendans, L. (Liam) (1757) Friday 31 October 2025 DRAW +6.2
Min, J.J. (Jaap Jan) (1646) Friday 11 April 2025 LOSS -9.9
Speckamp, J. (Jeroen) (1733) Saturday 5 April 2025 LOSS -7.1
Nigten, R. (Richard) (1635) Monday 31 March 2025 WIN +14.4
Heijungs, S. (Simon) (1677) Saturday 8 March 2025 LOSS -9.1
Demarteau, M. (Marijn) (1530) Saturday 8 February 2025 DRAW -1.8
Otte, T. (Thomas) (1784) Friday 17 January 2025 LOSS -6.1
Heydari, M.R. (Mohammed Reza) Monday 13 January 2025 LOSS
Vos, R.T. (Roeland) Saturday 14 December 2024 DRAW
Rooijakkers, L. (Liam) (1832) Monday 2 December 2024 LOSS -5.0