What is Ruben Gideon Koellner's FIDE rating?

Ruben Gideon Koellner's FIDE rating is 2535 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 2,483 over-the-board games by Ruben Gideon Koellner (778 classical, 69 rapid, 1,636 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

TitleInternational MasterFederationGermanyBorn2004FIDE ID12993093

Classical2535▲ 2

Rapid2425

Blitz2384

Games2,483

W · D · LWon · Drawn · Lost45 / 18 / 37

Peak2535Oct 2026

Rating history

2300

2400

2500

Peak2535

Oct

2024

Apr

Jul

Oct

2025

Apr

Jul

Oct

2026

Apr

Jul

Oct

Oct 2023Nov 2026

Classical2535Rapid2425Blitz2384no games played

Accuracy by phase

95.7%Opening93.3%Middlegame95.6%Endgame

Clutch factor

Insufficient data

Play style

Elite accuracy: 93.0% average

High resilience (63%): Dangerous even when losing

Solid conversion: 87%

Very consistent (88%)

Very precise: only 0.1 blunders/game

Dominates 1.Nf3 as

(75% in 16 games)

Vulnerable to 1.Nf3

(only 38%)

Recent games

Royal, Shreyas(2533)

Bundesliga 2026-27 · 11 Oct 2026

0–1

Sedlak, Nikola(2375)

Bundesliga 2026-27 · 10 Oct 2026

½–½

Lagarde, Maxime(2597)

Bundesliga 2026-27 · 9 Oct 2026

1–0

Nesterov, Arseniy(2590)

Titled Tuesday · 1 Sept 2026

1–0

Kiringoda, Thehas Rithmitha(2115)

Titled Tuesday · 1 Sept 2026

0–1

Play against Koellner's Twin

Their real openings, level & style

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

Based on

2,483 games

Based on 2,483 games

Openings

1,250 games as White · scores 57.0%

Weaknesses

where they slip as ♔ White

Trompowsky Attack1.d4 ♞f6 2.♝g5 d587 games, last played 7 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

By family

open a family to see its lines

PROTime controls · Years · Events

2,483 games in scope

LineECOGamesLast playedWins · draws · lossesScorevs 57.0%

A45–A506702m

47%1736%

55.4%—

A40–D044853w

50%1634%

58.4%—

A80302y

50%743%

53.3%−3.7 pts

A00–A04207m

65%20%15

75.0%+18.0 pts

D10152y

47%40%13

66.7%—

D31103y

56%22%22%

60.0%—

B10–B1263y

67%33%

83.3%—

B23–B5055y

80%20%

90.0%—

Mistakes

Problematic pieces

Insufficient data

Critical moment

Insufficient data

Error heatmap · Critical squaresError heatmap

Insufficient data

Critical blunders

Tactical errors analyzed with Stockfish

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Endgame statistics

361 endgames (61.6%) · force Opposite-Color Bishops (7%)

Strongest

79.4%

R+Bishop vs R+Knight

Weakest

60.6%

Pure Pawn

Reaches Endgame

61.6%

361 / 586

B vs N Pref

52.4%·47.8%

prefers the bishop

PiecesTypeWin %games

Rook + Equal Minors

56%44%

77.9%353g

R+Bishop vs R+Knight

59%41%

79.4%306g

Rook vs Minor (Exchange)

49%50%

73.7%281g

Rook vs Rook

48%50%

72.6%252g

Rook vs Two Minors

56%44%

78.1%160g

Pure Pawn

36%50%14

60.6%109g

Rook + Equal Minors77.9%353g

R+Bishop vs R+Knight79.4%306g

Rook vs Minor (Exchange)73.7%281g

Rook vs Rook72.6%252g

Rook vs Two Minors78.1%160g

Pure Pawn60.6%109g

Weak in Opposite-Color Bishops: only 7% win rate (14 games). Force this endgameShow all 14 types

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Repertoire

PROTime controls · Years · Events

2,483 games in scope

Explore the repertoireevery move played, ranked by frequency

1,250 games48%W17%D35%L

1,250games in this linewon 48%, drew 17%, lost 35%

Move

1. d4

12133w

48%1735%

57%

1. ♞f3

167m

63%25%12

75%

1. e4

163y

50%31%19%

66%

1. d3

15y

100%

1. h4

14y

100%

1. a3

14y

100%

1. c3

13y

100%

1. c4

15y

Scouting report: Ruben Gideon Koellner (IM, GER)

Ruben Gideon Koellner

Rating history

Play style

Recent games

Play against Koellner's Twin

Openings

Weaknesses

Strengths

By family

Mistakes

Critical blunders

Endgame statistics

Repertoire