Jacques Koolstra

Rated since January 2023

1624 Classic

1625 Rapid

1633 Blitz

RIVALRY

Nemesis

Vaassen, M. (Mick)

Games: 4 · Win rate: 50%

Kryptonite

Looman, J.F.M. (Hans)

Games: 5 · Win rate: 0%

Easy Target

Kraay, J. (Jos)

Games: 5 · Win rate: 100%

The good & the bad

Best wins

HUIJSER, L.J. (LEON) 1887

9057 EsPion interne competitie 2023-2024 Voorjaar ronde 11-14 · Monday 6 May 2024

ENSERINK, H. (HENK) 1822

8654 EsPion interne competitie 2023-2024 Voorjaar ronde 2-5 · Monday 18 March 2024

STEENSMA, F. (FRANK) 1807

9057 EsPion interne competitie 2023-2024 Voorjaar ronde 11-14 · Monday 29 April 2024

TJONG-AKIET, R. (RAF) 1788

8859 EsPion interne competitie 2023-2024 Voorjaar ronde 6-10 · Monday 22 April 2024

BOOM, H. (HARRIE) 1701

11862 S.V. EsPion interne competitie 01-12-2025 t/m 22-12-2025 (080015) · Monday 1 December 2025

Worst losses

LOOMAN, J.F.M. (HANS) 1254

8309 EsPion interne competitie 2023-2024 Ronde 12 - 14 · Monday 15 January 2024

STOLP, H.P. (PETER) 1342

7047 EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 8 - 12 · Monday 3 April 2023

KOOPMAN, G.J.K. (GABRIELLA) 1434

12889 S.V. EsPion interne competitie 02-02-2026 t/m 23-02-2026 (080015) · Monday 9 February 2026

PLANTFEBER, H.J. (HENK) 1456

7712 EsPion interne competitie 2023-2024 Ronde 1-4 · Monday 16 October 2023

BEZEMER, C. (CASPER) 1503

11861 S.V. EsPion interne competitie 03-11-2025 t/m 24-11-2025 (080015) · Monday 3 November 2025

No FIDE-rated tournaments found.

S.V. EsPion interne competitie 31-03-2026 t/m 20-04-2026 (080015) Monday 2 February 2026 +1–1=0 -8.7

S.V. EsPion interne competitie 02-03-2026 t/m 23-03-2026 (080015) Monday 2 February 2026 +4–4=0 +34.2

S.V. EsPion interne competitie 02-02-2026 t/m 23-02-2026 (080015) Monday 2 February 2026 +1–2=1 -16.2

SGA Competitie 2025-2026 Viertallen ronde 1 en 5 Wednesday 1 October 2025 +0–0=2 -3.9

S.V. EsPion interne competitie 05-01-2026 t/m 26-01-2026 (080015) Monday 22 September 2025 +1–2=1 +0.7

S.V. EsPion interne competitie 01-12-2025 t/m 22-12-2025 (080015) Monday 22 September 2025 +1–2=0 -7.1

S.V. EsPion interne competitie 03-11-2025 t/m 24-11-2025 (080015) Monday 22 September 2025 +1–1=1 -14.8

S.V. EsPion interne competitie 29-09-2025 t/m 27-10-2025 (080015) Monday 22 September 2025 +2–1=0 +13.3

S.V. EsPion interne competitie 22-09-2025 t/m 22-09-2025 (080015) Monday 22 September 2025 +0–1=0 -2.9

S.V. EsPion interne competitie 28-07-2025 t/m 25-08-2025 (080015) Monday 2 June 2025 +6–1=0 +35.3

S.V. EsPion interne competitie 30-06-2025 t/m 21-07-2025 (080015) Monday 2 June 2025 +1–4=2 -18.8

S.V. EsPion interne competitie 02-06-2025 t/m 23-06-2025 (080015) Monday 2 June 2025 +2–5=1 -35.6

S.V. EsPion interne competitie 12-05-2025 t/m 26-05-2025 (080015) Monday 3 February 2025 +0–1=0 -9.4

S.V. EsPion interne competitie 31-03-2025 t/m 28-04-2025 (080015) Monday 3 February 2025 +1–1=2 -9.9

S.V. EsPion interne competitie 03-03-2025 t/m 24-03-2025 (080015) Monday 3 February 2025 +1–0=1 +14.9

S.V. EsPion interne competitie 03-02-2025 t/m 24-02-2025 (080015) Monday 3 February 2025 +0–3=1 -38.8

S.V. EsPion interne competitie 27-01-2025 t/m 27-01-2025 (080015) Monday 23 September 2024 +0–0=1 +2.9

S.V. EsPion interne competitie 06-01-2025 t/m 20-01-2025 (080015) Monday 23 September 2024 +1–1=0 -4.3

S.V. EsPion interne competitie 28-10-2024 t/m 23-12-2024 (080015) Monday 23 September 2024 +3–4=1 -12.4

S.V. EsPion interne competitie 23-09-2024 t/m 21-10-2024 (080015) Monday 23 September 2024 +1–1=0 -8.5

EsPion interne competitie 2023-2024 Voorjaar ronde 15-17 Monday 2 October 2023 +0–3=0 -41.3

EsPion interne competitie 2023-2024 Voorjaar ronde 11-14 Monday 2 October 2023 +2–2=0 +15.5

EsPion interne competitie 2023-2024 Voorjaar ronde 6-10 Monday 2 October 2023 +2–2=0 +7.4

EsPion interne competitie 2023-2024 Voorjaar ronde 2-5 Monday 2 October 2023 +2–1=0 +12.9

EsPion interne competitie 2023-2024 Ronde 1 Monday 2 October 2023 +1–0=0 +18.1

EsPion interne competitie 2023-2024 Ronde 15 - 17 Monday 2 October 2023 +1–1=0 +11.3

EsPion interne competitie 2023-2024 Ronde 12 - 14 Monday 2 October 2023 +2–1=0 -8.5

EsPion interne competitie 2023-2024 Ronde 9 - 11 Monday 2 October 2023 +1–1=0 -5.8

EsPion interne competitie 2023-2024 Ronde 5-8 Monday 2 October 2023 +1–1=1 -1.3

EsPion interne competitie 2023-2024 Ronde 1-4 Monday 2 October 2023 +1–2=1 -16.8

EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 17 Monday 26 September 2022 +0–0=1 -8.5

EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 13 - 16 Monday 26 September 2022 +0–1=0 -9.6

EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 8 - 12 Monday 26 September 2022 +1–2=1 -26.4

EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 4 - 7 Monday 26 September 2022 +1–2=0 -2.1

EsPion Interne competitie 2022-2023 Voorjaar 2023 ronde 1 - 3 Monday 26 September 2022 +2–1=0 +0.7

EsPion Interne competitie 2022-2023 Najaar 2022 Ronde 17 Monday 26 September 2022 +0–1=0 -12.9

EsPion Interne competitie 2022-2023 Najaar 2022 Ronde 14-16 Monday 26 September 2022 +2–1=0 +5.0

EsPion Interne competitie 2022-2023 Najaar 2022 ronde 10-13 Monday 26 September 2022 +2–1=1 -2.2

Rating History

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Peak Ratings

Classic 1750 June 1, 2024

Rapid 1625 Sept. 1, 2025

Blitz 1633 April 1, 2026

Games

Wins 48

Losses 58

Draws 19

Win Rate 38%

Performance by Color

Color	Wins	Draws	Losses	Win Rate
White	24	10	28	39%
Black	24	9	30	38%

Recent Matches

Boom, H. (Harrie) (1744) Monday 20 April 2026 LOSS -8.7

Borch van der, R. (Renik) Tuesday 31 March 2026 WIN

Liesting, T.S. (Tomas) (1822) Monday 23 March 2026 LOSS -5.9

Koolstra, J.R. (Jan) (1607) Monday 16 March 2026 WIN +12.1

Dekker, C. (Constantijn) (2018) Monday 9 March 2026 LOSS -2.0

Zult, O. (Olav) (1504) Monday 2 March 2026 DRAW -1.9

Kips, D. (David) (1631) Monday 2 March 2026 WIN +13.0

Zult, O. (Olav) (1504) Monday 2 March 2026 DRAW -1.9

Suurendonk, P. (Paul) (1630) Monday 23 February 2026 DRAW -0.1

Kraay, J. (Jos) (1403) Monday 16 February 2026 WIN +5.2

Koopman, G.J.K. (Gabriella) (1434) Monday 9 February 2026 LOSS -19.0

Dekker, C.C. (Casper) (2007) Monday 2 February 2026 LOSS -2.4

Merkul, E. (Eugen) (1681) Monday 26 January 2026 LOSS -10.8

Kerkhoff, F.C. (Frans) (1691) Monday 19 January 2026 WIN +14.5

Liesting, T.S. (Tomas) (1850) Monday 12 January 2026 LOSS -5.6

Rijn van, A. (André) (1709) Monday 5 January 2026 DRAW +2.6