What is Ruben Gideon Koellner's FIDE rating?

Ruben Gideon Koellner's FIDE rating is 2533 standard, 2425 rapid, 2384 blitz. Chess Stalker tracks it together with Ruben Gideon Koellner's over-the-board games and opening repertoire.

How many OTB games has Ruben Gideon Koellner played?

The Chess Stalker database holds 2,480 over-the-board games by Ruben Gideon Koellner (2,409 classical, 31 rapid, 40 blitz), with 45% wins. The full list, with openings and results, is on Ruben Gideon Koellner's Chess Stalker profile.

How do I prepare against Ruben Gideon Koellner?

Open Ruben Gideon Koellner's free Chess Stalker report: opening repertoire with results per line as White and Black, recurring weaknesses and blunder patterns evaluated with Stockfish, and recent games. Then rehearse against the Twin Bot, which imitates Ruben Gideon Koellner's style, before facing them.

Ruben Gideon Koellner

Germanyborn 2004FIDE ID 12993093

Rating & statistics

FIDE rating lists · Sep 2023 – Sep 2026

2300

2400

2500

2600

Peak2533

2485 · Sep 2023

Oct

2024

Apr

Jul

Oct

2025

Apr

Jul

Oct

2026

Apr

Jul

Oct

Sep 2023Oct 2026

2533Classical

2425Rapid

2384Blitz

2533peak, Sep 2026

2,480games

1,118wins, 45%

439draws, 18%

917losses, 37%

Rated gamesInactive · rating frozenOfficial FIDE lists · drag the range below the chartPeak 2533 · Sep 2026

Play style

before facing themWhat you need to know before facing them

Elite accuracy: 93.0% average

High resilience (69%): Dangerous even when losing

Solid conversion: 86%

Very consistent (88%)

Very precise: only 0.1 blunders/game

Dominates 1.Nf3 as

(75% in 16 games)

Vulnerable to 1.Nf3

(only 38%)

Play against Koellner's Twin

Their real openings, level & style

Practice against a bot that uses their real openings and playing style

Based on

2,480 games

Based on 2,480 games

Openings

2,480 gamesBased on 2,480 player games

Weaknesses

where they slip as ♔ White

Trompowsky Attack1.d4 ♞f6 2.♝g5 d587 games, last played 5 months ago44.8%losses

Dutch Defense1.d4 f5 2.♝g5 g611 games, last played 3 years ago45.5%losses

Strengths

what holds up for them as ♔ White

No consistent strengths detected as white

Deep analysis

Stockfish · Classical · 549 analyzedStockfish · Classical games · 549 analyzed

Accuracy by phase

Opening

95.7%

Middlegame

93.3%

Endgame

95.6%

Clutch factor

+6%

Winning (+2)Winning (+2)

94%228g

EqualEqual position

94%154g

Losing (−2)Losing (−2)

89%118g

Accuracy under pressure barely drops when losing.

Problematic pieces

25%

112 err

21%

91 err

15%

66 err

14%

63 err

13%

59 err

12%

51 err

Critical moment

Move 40 avg

1-15

22%

16-25

28%

26-35

36-45

38%

46+

38% of blunders occur after move 46. Keep tension until then.of blunders occur after move 46. Keep tension until then.

Error heatmap · Critical squaresError heatmap

Few

Many

139Errors mapped

e5 / f3Hotspot zone

Critical squares

1616 err

1515 err

1414 err

e5/f3 concentrate most errors. Force decisions in those zones.

Critical blunders

10 errors · Stockfish

#35

♜c7+?? vs Wagner

Endgame · Rapid · 2025

#29

♜f8?? vs Vogel

Middlegame · OTB · 2025

♝c4?? vs Santos Latasa

Opening · Rapid · 2025

#14

♛e6?? vs Rodshtein

Middlegame · Blitz · 2025

#35

♛c5?? vs Hansen

Endgame · Rapid · 2025

#51

♚d6?? vs Teclaf

Endgame · Rapid · 2025