Chess Stalker — Free Chess Opponent Analysis

Analyze any Lichess, Chess.com or FIDE player's openings, weaknesses, blunder patterns and psychological profile. Train against a Twin Bot that replicates your opponent's style. Search by username or FIDE ID across 11 million+ games. Free to use, no signup required.

What you get

Opponent weakness analysis — opening repertoire, common blunders, time pressure patterns
Twin Bot — practice against an AI clone of your opponent's exact playing style
FIDE OTB database — 11 million+ tournament games and 1.7 million+ rated players
Stockfish-powered analysis with depth-25 evaluations
Multi-platform: Lichess, Chess.com, and FIDE in one place
Head-to-head comparison, Nemesis detection, Stalker Score

How it works

Search any Lichess, Chess.com username or FIDE player
Get instant scouting report with weaknesses and patterns
Prepare your strategy and practice against the Twin Bot

GM

Theodorou, Nikolas

GRE GRE·Born 2000·FIDE #4262875·2,556 Games

Classical26342,230 Games

Rapid2600154 Games

Blitz2555219 Games

Statistics

2556

Total

1292

Wins

745

Draws

514

Losses

51%29%20%

Play Style

What you need to know before facing them

Elite accuracy: 94.0% average

High resilience (59%): Dangerous even when losing

Solid conversion: 84%

Very consistent (91%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♔ (72% in 65 games)

Deep Analysis

Stockfish 18 · Classical games · 575 analyzed

Accuracy by phase

Opening96.2%

Middlegame93.8%

Endgame95.2%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)95%

185 Games

Equal position95%

235 Games

Losing (-2 or more)90%

80 Games

Problematic Pieces

Which pieces cause most errors?

♖

26%

89 errors

♕

20%

69 errors

♙

17%

57 errors

♞

15%

50 errors

♗

12%

41 errors

♔

10%

33 errors

Critical Moment

When does the first serious error occur?

Move 51average

1-15

16-25

26-35

36-45

46+

39% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

9

10

13

9

19

9

11

9

10

8

abcdefgh

Many

Few

Critical squares

e419 err

d513 err

h411 err

f610 err

g310 err

e4/d5 concentrate most errors. Force decisions in those zones.

Recent Games

W

Fellowes, Billy2106

1st 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Nguyen Tung Quan2197

1st 3-0 Thu 28th May 2026 · 28 May 2026

1-0

L

Ashraf, Artin2470

1st 3-0 Thu 28th May 2026 · 28 May 2026

1-0

L

Gilfanov, Marat I2301

1st 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Szpar, Milosz2496

1st 3-0 Thu 28th May 2026 · 28 May 2026

1-0

D

Pranav,V2657

1st 3-0 Thu 28th May 2026 · 28 May 2026

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Nimzo-Indian: Rubinstein

41.2%

17 Games·Loses

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Caro-Kann

81.8%

11 Games·Wins

1.e4 c6 2.Nf3 d5

Reti: Reversed London

70.0%

10 Games·Wins

1.Nf3 d5 2.g3 c6

Black

Sicilian: Sveshnikov

76.5%

17 Games·Wins

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5

Ruy Lopez: Morphy

62.8%

43 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#57Qf4+??

Endgame

vs Maksimovic

OTB·2026

▶

#87Bh3??

Endgame

vs Bluebaum

OTB·2026

▶

#75Kg6??

Endgame

vs Nguyen

OTB·2026

▶

#59Kxh7??

Endgame

vs Lobanov

Blitz·2025

▶

#59Ke5??

Endgame

vs Hong

Blitz·2025

▶

#40Rd7??

Tactics

vs Gokerkan

Blitz·2025

▶

#27Bxc5??

Tactics

vs Bortnyk

Blitz·2025

▶

#25f3??

Tactics

vs Raja Harshit

Blitz·2025

▶

#22Qa6??

Tactics

vs Grafl

Blitz·2025

▶

#35Rc8??

Tactics

vs Sindarov

Blitz·2025

Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2026

2025

2024

2023

2022

2021

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

1294 Games

55%28%17%

Move	Games	Performance	%
1.d4	620		68%
1.Nf3	426		70%
1.e4	175		66%
1.c4 Strong	65		72%
1.g3 Strong	4		75%
1.Nc3 Strong	2		100%
1.a3	1		50%
1.b3 Weak	1		0%

1.d4

68%

620

1.Nf3

70%

426

1.e4

66%

175

1.c4

72%

65

1.g3

75%

4

1.Nc3

100%

2

1.a3

50%

1

1.b3

0%

1

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