KNSB FIDE
KS

Kostandinos Sideras

Rated since January 2023

1873 Classic
1873 Rapid
1873 Blitz

Team Competition

Current teams
Spijkenisse 1
Klasse 1A · 2025-2026 · 5 games
Spijkenisse 2
Klasse 5J · 2025-2026 · 5 games

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
KEMPEN VAN, A. (ARNOUT) 1933
13315 KNSB competitie 2025-2026 Klasse 5 ronde 5 · Saturday 28 March 2026
VERSTEEG, H.J. (HENNY) 1856
12992 KNSB competitie 2025-2026 Klasse 5 ronde 6 · Saturday 7 February 2026
STOKER, J.C. (JOOST) 1795
10991 OKD: Open Kampioenschap Drechtstreek 2025 Groep A · Friday 23 May 2025
STROOSMA, H. (HARRY) 1779
12667 RSB Competitie 2025-2026 Achtallen december · Friday 14 November 2025
KIEVIT DE, E. (EMILIAN) 1740
10991 OKD: Open Kampioenschap Drechtstreek 2025 Groep A · Thursday 19 June 2025
Worst losses
SANTIFORT, J. (JAAP) 1817
13445 RSB Competitie 2025-2026 Viertallen maart · Thursday 19 March 2026
HARTKOREN, M.H. (MAARTEN) 1845
10991 OKD: Open Kampioenschap Drechtstreek 2025 Groep A · Thursday 10 July 2025
HOOGENES, M.L.N. (MENNO) 1892
10471 Tata Steel Chess Tournament 2026 Weekendvierkampem · Sunday 18 January 2026
KROES, M. (MICHAEL) 1915
13177 RSB Competitie 2025-2026 Achttallen februari · Monday 23 February 2026
SCHIPPERS, F.J. (FRANK) 1928
10471 Tata Steel Chess Tournament 2026 Weekendvierkampem · Friday 16 January 2026
Tata Steel Chess Tournament 2026 Weekendvierkampem Friday 16 January 2026 +0–2=1 -25.1
KNSB competitie 2025-2026 Klasse 5 ronde 5 Saturday 20 September 2025 +1–0=0 +14.6
KNSB competitie 2025-2026 Klasse 5 ronde 6 Saturday 20 September 2025 +1–0=0 +11.6
KNSB competitie 2025-2026 Klasse 5 ronde 4 Saturday 20 September 2025 +0–0=1 +2.3
KNSB competitie 2025-2026 Klasse 5 Ronde 3 Saturday 20 September 2025 +0–0=1 +4.6
KNSB competitie 2025-2026 Klasse 5 ronde 2 Saturday 20 September 2025 +1–0=0
RSB Competitie 2025-2026 Achttallen maart Monday 1 September 2025 +1–0=0 +0.6
RSB Competitie 2025-2026 Viertallen maart Monday 1 September 2025 +0–1=0 -14.4
RSB Competitie 2025-2026 Achttallen februari Monday 1 September 2025 +0–1=0 -11.4
RSB Competitie 2025-2026 Viertallen februari Monday 1 September 2025 +0–1=0 -10.8
RSB Competitie 2025-2026 Achtallen december Monday 1 September 2025 +1–0=0 +8.4
RSB Competitie 2025-2026 Beker ronde 1 Monday 1 September 2025 +0–1=0 -7.0
RSB Competitie 2025-2026 Achttallen Oktober Monday 1 September 2025 +0–0=1 -2.9
OKD: Open Kampioenschap Drechtstreek 2025 Groep A Thursday 22 May 2025 +3–3=1 -9.0

Rating History

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Peak Ratings

Classic 1912 March 1, 2024
Rapid 1873 April 1, 2026
Blitz 1873 April 1, 2026

Games

Wins 8
Losses 9
Draws 5
Win Rate 36%

Performance by Color

Color Wins Draws Losses Win Rate
White 6 4 2 50%
Black 2 1 7 20%

Recent Matches

Kempen van, A. (Arnout) (1933) Saturday 28 March 2026 WIN +14.6
Doolaard, T. (Tobie) (1311) Friday 27 March 2026 WIN +0.6
Santifort, J. (Jaap) (1817) Thursday 19 March 2026 LOSS -14.4
Kroes, M. (Michael) (1915) Monday 23 February 2026 LOSS -11.4
Mac Lean, H.M. (Murdoch) (1933) Thursday 12 February 2026 LOSS -10.8
Versteeg, H.J. (Henny) (1856) Saturday 7 February 2026 WIN +11.6
Hoogenes, M.L.N. (Menno) (1892) Sunday 18 January 2026 LOSS -13.1
Okita, R. (Ryoga) (1892) Saturday 17 January 2026 DRAW -0.3
Schippers, F.J. (Frank) (1928) Friday 16 January 2026 LOSS -11.8
Flanders, C.E. (Cander) (1964) Saturday 13 December 2025 DRAW +2.3
Verwer, S.E. (Sicco) (2037) Saturday 22 November 2025 DRAW +4.6
Stroosma, H. (Harry) (1779) Friday 14 November 2025 WIN +8.4
Hennekes, J. (Jacques) (2065) Saturday 1 November 2025 LOSS -7.0
Atassi, T.A. (Tarek) Saturday 1 November 2025 WIN
Dam van, M.L.J. (Martijn) (1817) Thursday 2 October 2025 DRAW -2.9
Hartkoren, M.H. (Maarten) (1845) Thursday 10 July 2025 LOSS -14.8
Bekebrede, E.W. (Evert) (1732) Thursday 3 July 2025 WIN +6.6
Rooijen den, T.F.H. (Teunis) (1997) Thursday 26 June 2025 LOSS -9.5
Kievit de, E. (Emilian) (1740) Thursday 19 June 2025 WIN +6.9
Hubregtse, S. (Sjoerd) (1985) Thursday 12 June 2025 LOSS -10.0