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

Rustemov, Alexander

RUS RUS·Born 1973·FIDE #4119002·7,145 Games

Classical25257,056 Games

Rapid249458 Games

Blitz—31 Games

Statistics

7145

Total

3688

Wins

1374

Draws

2082

Losses

52%19%29%

Play Style

What you need to know before facing them

Elite accuracy: 90.2% average

Very consistent (86%)

Very precise: only 0.3 blunders/game

Dominates 1.d4 ♔ (65% in 3372 games)

Deep Analysis

Stockfish 18 · Classical games · 211 analyzed

Accuracy by phase

Opening96.3%

Middlegame91.7%

Endgame93.9%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)92%

85 Games

Equal position93%

39 Games

Losing (-2 or more)87%

87 Games

Problematic Pieces

Which pieces cause most errors?

♙

21%

80 errors

♖

20%

77 errors

♔

16%

61 errors

♕

16%

64 errors

♞

15%

59 errors

♗

13%

49 errors

Critical Moment

When does the first serious error occur?

Move 41average

1-15

16-25

26-35

36-45

46+

38% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

10

11

13

10

12

10

18

16

15

10

abcdefgh

Many

Few

Critical squares

b418 err

e416 err

g415 err

f613 err

d512 err

b4/e4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Brown, Akeem2060

2nd 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Sarana, Alexey2664

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

0-1

W

Le Tuan Minh (VIE)2585

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

1-0

W

Yilmaz, Baver2317

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

Nguyen, Luong Vu2073

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

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

1.b3 d5 2.Bb2 Nf6

54.8%

31 Games·Loses

1.b3 d5 2.Bb2 Nf6

Strengths

AVOID

White

King's Indian

56.9%

504 Games·Wins

1.d4 Nf6 2.c4 g6

Queen's Gambit Declined

58.6%

406 Games·Wins

1.d4 d5 2.c4 e6

Black

French: Rubinstein

50.0%

346 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 dxe4

1.g3 d5 2.Bg2 Nf6

70.0%

10 Games·Wins

1.g3 d5 2.Bg2 Nf6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#26Rae1??

Tactics

vs Goncharov

OTB·2025

▶

#36Kh3??

Tactics

vs Gurbanov

OTB·2025

▶

#40Ne1??

Tactics

vs Terry

OTB·2025

▶

#14g6??

Tactics

vs Svane

OTB·2025

▶

#64Rh3??

Endgame

vs Mitrabha

OTB·2025

▶

#13Qxf3??

Tactics

vs Ashraf

OTB·2025

▶

#55a6??

Endgame

vs Martirosyan

OTB·2025

▶

#50h3??

Endgame

vs Punin

OTB·2025

▶

#33Qxg3??

Tactics

vs Pavlidou

OTB·2025

▶

#57Rxh4+??

Endgame

vs Flores Quillas

OTB·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

3615 Games

55%19%26%

Move	Games	Performance	%
1.d4	3372		65%
1.Nf3	150		62%
1.c4	78		61%
1.e4	11		64%
1.d3 Weak	1		0%
1.g4 Weak	1		0%
1.b3	1		50%
1.f4 Weak	1		0%

1.d4

65%

3372

1.Nf3

62%

150

1.c4

61%

78

1.e4

64%

11

1.d3

0%

1

1.g4

0%

1

1.b3

50%

1

1.f4

0%

1

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