Ischa Zwikker

Rated since January 2023

1444 Classic

1542 Rapid

1495 Blitz

RIVALRY

Nemesis

Maas van der, J. (Jan)

Games: 4 · Win rate: 50%

Kryptonite

Riel van, J.J.C. (Jan)

Games: 9 · Win rate: 0%

Easy Target

Said, A. (Abdi)

Games: 7 · Win rate: 86%

The good & the bad

Best wins

KOOIMAN, E.J. (EGBERT) 1730

11500 S.V. Castricum interne competitie 06-06-2025 t/m 06-06-2025 (090009) · Friday 6 June 2025

MAAS VAN DER, J. (JAN) 1666

11500 S.V. Castricum interne competitie 06-06-2025 t/m 06-06-2025 (090009) · Friday 6 June 2025

HOEKSTRA, S. (SJOERD) 1606

11083 S.V. Castricum interne competitie 28-03-2025 t/m 25-04-2025 (090009) · Friday 11 April 2025

KOPPENAAL, J. (JAPPE) 1575

11083 S.V. Castricum interne competitie 28-03-2025 t/m 25-04-2025 (090009) · Friday 4 April 2025

VERKERK, F.W. (FRANK) 1556

8744 NHSB-competitie 2023-2024 Viertallen E t/m 26-03-2024 · Friday 22 March 2024

Worst losses

SCHOORL, P. (PUK) 856

8046 S.V. Castricum interne competitie 24-11-2023 t/m 22-12-2023 (090009) · Friday 8 December 2023

LUTE, N. (NICO) 1026

7551 S.V. Castricum interne competitie 01-09-2023 t/m 22-09-2023 (090009) · Friday 15 September 2023

REEK, R. (REIN) 1043

6739 S.V. Castricum interne competitie 24-02-2023 t/m 17-03-2023 (090009) · Friday 3 March 2023

LEEST VAN DER, A. (ALEX) 1044

8046 S.V. Castricum interne competitie 24-11-2023 t/m 22-12-2023 (090009) · Friday 22 December 2023

SLUITER, F. (FRANK) 1130

6534 S.V. Castricum interne competitie 07-01-2023 t/m 17-02-2023 (090009) · Friday 20 January 2023

No FIDE-rated tournaments found.

S.V. Castricum interne competitie 10-04-2026 t/m 24-04-2026 (090009) Friday 10 April 2026 +1–0=0 +5.4

S.V. Castricum interne competitie 27-02-2026 t/m 27-03-2026 (090009) Friday 27 February 2026 +0–6=0 -55.0

S.V. Castricum interne competitie 30-01-2026 t/m 20-02-2026 (090009) Friday 9 January 2026 +1–3=0 -2.1

S.V. Castricum interne competitie 09-01-2026 t/m 23-01-2026 (090009) Friday 9 January 2026 +1–2=0 -19.0

S.V. Castricum interne competitie 28-11-2025 t/m 19-12-2025 (090009) Friday 28 November 2025 +1–0=0 +9.7

S.V. Castricum interne competitie 31-10-2025 t/m 22-11-2025 (090009) Friday 31 October 2025 +1–1=0 -3.1

S.V. Castricum interne competitie 03-10-2025 t/m 24-10-2025 (090009) Friday 3 October 2025 +1–3=0 -12.7

S.V. Castricum interne competitie 05-09-2025 t/m 26-09-2025 (090009) Friday 5 September 2025 +0–0=2 +9.4

NHSB-competitie 2025-2026 Viertallen F t/m 05-04-2026 Monday 1 September 2025 +1–0=0 +9.7

NHSB-competitie 2025-2026 Viertallen F t/m 08-03-2026 Monday 1 September 2025 +2–0=0 +18.8

NHSB-competitie 2025-2026 Viertallen F t/m 15-02-2026 Monday 1 September 2025 +0–1=0 -12.5

NHSB-competitie 2025-2026 Viertallen F t/m 16-11-2025 Monday 1 September 2025 +0–1=0 -9.0

S.V. Castricum interne competitie 30-05-2025 t/m 27-06-2025 (090009) Friday 30 May 2025 +0–2=1 -19.7

S.V. Castricum interne competitie 06-06-2025 t/m 06-06-2025 (090009) Friday 30 May 2025 +2–5=0 -12.3

S.V. Castricum interne competitie 09-05-2025 t/m 24-05-2025 (090009) Friday 2 May 2025 +0–2=0 -21.5

S.V. Castricum interne competitie 02-05-2025 t/m 02-05-2025 (090009) Friday 2 May 2025 +2–2=1 +13.1

S.V. Castricum interne competitie 28-03-2025 t/m 25-04-2025 (090009) Friday 28 March 2025 +2–0=0 +34.1

S.V. Castricum interne competitie 28-02-2025 t/m 21-03-2025 (090009) Friday 28 February 2025 +2–1=1 +17.1

S.V. Castricum interne competitie 31-01-2025 t/m 21-02-2025 (090009) Friday 31 January 2025 +2–1=1 +12.0

S.V. Castricum interne competitie 20-12-2024 t/m 24-01-2025 (090009) Friday 20 December 2024 +2–1=0 +14.7

S.V. Castricum interne competitie 29-11-2024 t/m 13-12-2024 (090009) Friday 29 November 2024 +2–1=0 +7.6

S.V. Castricum interne competitie 01-11-2024 t/m 22-11-2024 (090009) Friday 1 November 2024 +1–1=0 +0.5

S.V. Castricum interne competitie 27-09-2024 t/m 25-10-2024 (090009) Friday 27 September 2024 +0–3=0 -31.6

S.V. Castricum interne competitie 06-09-2024 t/m 20-09-2024 (090009) Friday 6 September 2024 +1–1=0 +12.6

NHSB-competitie 2024-2025 Klasse 3C t/m 20-04-2025 Sunday 1 September 2024 +0–1=0 -9.6

NHSB-competitie 2024-2025 Klasse 3C t/m 29-03-2025 Sunday 1 September 2024 +0–1=0 -7.1

NHSB-competitie 2024-2025 Klasse 3C t/m 12-01-2025 Sunday 1 September 2024 +0–0=1 +1.1

NHSB-competitie 2024-2025 Klasse 3C t/m 28-11-2024 Sunday 1 September 2024 +0–2=0 -10.7

NHSB-competitie 2024-2025 Klasse 3C t/m 26-10-2024 Sunday 1 September 2024 +0–1=0 -15.0

S.V. Castricum interne competitie 31-05-2024 t/m 21-06-2024 (090009) Friday 31 May 2024 +0–1=0 -5.7

S.V. Castricum interne competitie 05-04-2024 t/m 24-05-2024 (090009) Friday 5 April 2024 +2–1=2 +39.1

S.V. Castricum interne competitie 01-03-2024 t/m 22-03-2024 (090009) Friday 1 March 2024 +0–1=0

S.V. Castricum interne competitie 27-01-2024 t/m 23-02-2024 (090009) Friday 26 January 2024 +3–1=0 +53.9

S.V. Castricum interne competitie 05-01-2024 t/m 19-01-2024 (090009) Friday 5 January 2024 +1–1=0 +26.3

S.V. Castricum interne competitie 23-12-2023 t/m 22-03-2024 (090009) Saturday 23 December 2023 +1–0=0

S.V. Castricum interne competitie 24-11-2023 t/m 22-12-2023 (090009) Friday 24 November 2023 +0–4=0 -58.6

S.V. Castricum interne competitie 03-11-2023 t/m 17-11-2023 (090009) Friday 27 October 2023 +0–2=0 -8.1

S.V. Castricum interne competitie 27-10-2023 t/m 27-10-2023 (090009) Friday 27 October 2023 +0–1=0 -2.1

S.V. Castricum interne competitie 29-09-2023 t/m 20-10-2023 (090009) Friday 29 September 2023 +0–2=0 -9.1

NHSB-competitie 2023-2024 Viertallen E t/m 26-03-2024 Friday 1 September 2023 +1–1=0 +10.6

NHSB-competitie 2023-2024 Viertallen E t/m 23-02-2024 Friday 1 September 2023 +0–1=0 -8.7

NHSB-competitie 2023-2024 Viertallen E t/m 26-12-2023 Friday 1 September 2023 +0–0=1

NHSB-competitie 2023-2024 Viertallen E t/m november Friday 1 September 2023 +1–0=1 +24.1

S.V. Castricum interne competitie 01-09-2023 t/m 22-09-2023 (090009) Friday 1 September 2023 +2–2=0 +25.9

S.V. Castricum interne competitie 26-05-2023 t/m 23-06-2023 (090009) Friday 26 May 2023 +1–1=1 -7.2

S.V. Castricum interne competitie 28-04-2023 t/m 19-05-2023 (090009) Friday 28 April 2023 +1–2=0 +42.5

S.V. Castricum interne competitie 31-03-2023 t/m 21-04-2023 (090009) Friday 31 March 2023 +1–1=0 -2.1

S.V. Castricum interne competitie 24-03-2023 t/m 30-06-2023 (090009) Friday 24 March 2023 +0–1=0

S.V. Castricum interne competitie 24-02-2023 t/m 17-03-2023 (090009) Friday 24 February 2023 +2–2=0 +80.2

S.V. Castricum interne competitie 07-01-2023 t/m 17-02-2023 (090009) Friday 6 January 2023 +2–3=0 +34.6

S.V. Castricum interne competitie 25-11-2022 t/m 23-12-2022 (090009) Friday 25 November 2022 +1–1=2 +20.0

Rating History

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Peak Ratings

Classic 1529 May 1, 2025

Rapid 1542 June 1, 2025

Blitz 1495 July 1, 2025

Games

Wins 44

Losses 71

Draws 14

Win Rate 34%

Performance by Color

Color	Wins	Draws	Losses	Win Rate
White	27	6	29	44%
Black	17	8	42	25%

Recent Matches

Said, A. (Abdi) (1204) Friday 17 April 2026 WIN +5.4

Albers, J.A. (Jos) (1367) Tuesday 31 March 2026 WIN +9.7

Duinker, J. (Han) (1720) Friday 27 March 2026 LOSS -4.6

Riel van, J.J.C. (Jan) (1581) Friday 20 March 2026 LOSS -8.5

Sluiter, F. (Frank) (1406) Friday 13 March 2026 LOSS -14.4

Ruijter de, P. (Paul) (1357) Friday 6 March 2026 WIN +9.4

Chadwick, J.C. (John) (1594) Friday 20 February 2026 LOSS -8.1

Koppenaal, J. (Jappe) (1570) Friday 13 February 2026 LOSS -4.4

Noort van der, W.D. (Wim) (1463) Monday 9 February 2026 LOSS -12.5

Schagen, J.I. (Hans) (1732) Saturday 7 February 2026 LOSS -4.3

Linden van der, R.W.H. (René) (1544) Friday 30 January 2026 WIN +14.7

Said, A. (Abdi) (1200) Friday 23 January 2026 WIN +4.1

Beukers, D.W. (Daan) (1425) Friday 16 January 2026 LOSS -14.4

Dijker, P. (Pieter) (1595) Friday 9 January 2026 LOSS -8.6

Sluiter, F. (Frank) (1403) Friday 19 December 2025 WIN +9.7

Reek, R. (Rein) (1280) Saturday 22 November 2025 WIN +5.6