KNSB FIDE
KS

Kostandinos Sideras

Rated since January 2023

1878 Classic
1873 Rapid
1873 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
ROOIJEN DEN, T.F.H. (TEUNIS) 2016
13330 OKD: Open Kampioenschap Drechtstreek 2026 Groep A · Thursday 4 June 2026
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
VERHAAR, N.J. (NIELS) 1818
13330 OKD: Open Kampioenschap Drechtstreek 2026 Groep A · Thursday 28 May 2026
HEEREN VAN, A. (ARIE) 1796
13330 OKD: Open Kampioenschap Drechtstreek 2026 Groep A · Thursday 2 July 2026
Worst losses
THEUNISSE, T.J. (THEO) 1814
14007 RSB Competitie 2025-2026 Achttallen juni · Friday 29 May 2026
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
Tata Steel Chess Tournament 2026 Weekendvierkampem Friday 16 January 2026 +0–2=1 -25.1
OKD: Open Kampioenschap Drechtstreek 2026 Groep A Thursday 21 May 2026 +3–2=2 +12.3
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 juni Monday 1 September 2025 +0–1=0 -7.3
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

Team Competition

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

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 11
Losses 12
Draws 7
Win Rate 37%

Performance by Color

Color Wins Draws Losses Win Rate
White 8 4 4 50%
Black 3 3 8 21%

Recent Matches

Heeren van, A. (Arie) (1796) Thursday 2 July 2026 WIN +10.1
Dieën van, A. (Andre) (1602) Thursday 25 June 2026 DRAW -8.2
Wilming, A.J. (Auke) (2136) Thursday 18 June 2026 LOSS -4.5
Boer, W. (Wout) (1954) Thursday 11 June 2026 LOSS -9.7
Rooijen den, T.F.H. (Teunis) (2016) Thursday 4 June 2026 WIN +17.3
Theunisse, T.J. (Theo) (1814) Friday 29 May 2026 LOSS -7.3
Verhaar, N.J. (Niels) (1818) Thursday 28 May 2026 WIN +10.6
Dobber, G. (Bert) (1779) Thursday 21 May 2026 DRAW -3.2
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