KNSB FIDE
JM

Johan Mostertman

Rated since January 2023

1788 Classic
1738 Rapid
1738 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
FAHNER, J. (JURRIAN) 1842
12817 Weekendtoernooi Groninger Combinatie / PK NOSBO Groep A · Sunday 17 May 2026
FEICHTNER, DAVID 1816
27. NordWest-Cup Open B · Saturday 31 January 2026
HOEK VAN, W.J. (WIM) 1748
11633 51e Open Seniorentoernooi 2025 Groep 4 · Tuesday 15 July 2025
RIENSTRA, F.H. (FRED) 1745
14115 52e Open Seniorentoernooi 2026 Groep 5 · Wednesday 15 July 2026
LOOFF DE, J.C. (KEES) 1740
14115 52e Open Seniorentoernooi 2026 Groep 5 · Monday 13 July 2026
Worst losses
TAN, JING KAI BRYCE 1684
11814 Open Schaakkampioenschap van Arnhem OSKA 2025 Groep B · Saturday 6 September 2025
VAN NEER, SEPPE 1688
10472 Tata Steel Chess Tournament 2026 Dagvierkampen · Monday 19 January 2026
SCHOL, J. (JAN) 1748
11633 51e Open Seniorentoernooi 2025 Groep 4 · Monday 14 July 2025
STOOP, J. (JAN) 1782
11633 51e Open Seniorentoernooi 2025 Groep 4 · Friday 18 July 2025
ENGELHAUPT, HENRY 1798
27. NordWest-Cup Open B · Sunday 1 February 2026
Weekendtoernooi Groninger Combinatie / PK NOSBO Groep A Thursday 14 May 2026 +2–3=2 +13.8
27. NordWest-Cup Open B Thursday 29 January 2026 +4–2=1 +19.4
Tata Steel Chess Tournament 2026 Dagvierkampen Friday 16 January 2026 +2–1=0 -1.6
Chessfestival Groningen Seniorentoernooi - Friday 26 December 2025 +0–2=2 -6.5
Open Schaakkampioenschap van Arnhem OSKA 2025 Groep B Friday 5 September 2025 +3–2=1 -22.0
52e Open Seniorentoernooi 2026 Groep 5 Monday 13 July 2026 +3–0=2 +36.2
34th OPEN CHESS TOURNAMENT OF KAVALA VASILIS THEODORIDIS B Monday 28 July 2025 +2–2=4 -25.2
51e Open Seniorentoernooi 2025 Groep 4 Monday 14 July 2025 +2–2=1 -7.1

Rating History

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Peak Ratings

Classic 1831 Aug. 1, 2024
Rapid 1738 April 1, 2026
Blitz 1738 May 1, 2026

Games

Wins 18
Losses 14
Draws 13
Win Rate 40%

Performance by Color

Color Wins Draws Losses Win Rate
White 11 7 3 52%
Black 7 6 11 29%

Recent Matches

Ypma, P. (Piet) (1735) Friday 17 July 2026 WIN +11.9
Tuna, O. (Özden) (1752) Thursday 16 July 2026 DRAW
Rienstra, F.H. (Fred) (1745) Wednesday 15 July 2026 WIN +12.3
Beerdsen, M.H. (Marco) (1750) Tuesday 14 July 2026 DRAW -0.1
Looff de, J.C. (Kees) (1740) Monday 13 July 2026 WIN +12.1
Fahner, J. (Jurrian) (1842) Sunday 17 May 2026 WIN +16.1
Ptakha, A.Y. (Artur) Sunday 17 May 2026 DRAW
Ambrona Navarro, H.A.N. (Himar) (2090) Saturday 16 May 2026 LOSS -2.7
Aden, M. (Meino) (1949) Saturday 16 May 2026 LOSS -5.8
Bloemhof, R.B.P. (Ruben) (1890) Friday 15 May 2026 DRAW +5.1
Ma, Y.H. (Ying Hao) (1631) Friday 15 May 2026 WIN +8.9
Vermeulen, F. (Frans) (1881) Thursday 14 May 2026 LOSS -7.7
Pass, Marlon (1844) Sunday 1 February 2026 DRAW +4.0
Engelhaupt, Henry (1798) Sunday 1 February 2026 LOSS -10.1
Feichtner, David (1816) Saturday 31 January 2026 WIN +15.6
Krause, Volker (1452) Saturday 31 January 2026 WIN +4.2
Ewert, Stefan (1841) Friday 30 January 2026 LOSS -8.6
Trunz, Daniel (1529) Friday 30 January 2026 WIN +6.1
Schenk, Michael (1600) Thursday 29 January 2026 WIN +8.2
Smeenge, J. (Jordy) Wednesday 21 January 2026 WIN