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

IM

Weinstein, Norman

USA USA·Born 1950·FIDE #2000466·400 Games

Classical2450400 Games

Rapid—0 Games

Blitz—0 Games

Statistics

400

Total

160

Wins

142

Draws

98

Losses

40%36%25%

Play Style

What you need to know before facing them

Elite accuracy: 92.7% average

Plays 4.0% better with black

Very consistent (90%)

Very precise: only 0.1 blunders/game

Dominates 1.e4 ♔ (62% in 188 games)

Deep Analysis

Stockfish 18 · Classical games · 7 analyzed

Accuracy by phase

Opening96.1%

Middlegame92.4%

Endgame93.5%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)93%

1 Games

Equal position94%

4 Games

Losing (-2 or more)87%

2 Games

Problematic Pieces

Which pieces cause most errors?

♖

83%

5 errors

♙

17%

1 errors

♗

0%

0 errors

♔

0%

0 errors

♞

0%

0 errors

♕

0%

0 errors

Critical Moment

When does the first serious error occur?

Move 34average

1-15

16-25

26-35

36-45

46+

100% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

1

1

1

1

1

1

abcdefgh

Many

Few

Critical squares

d51 err

d61 err

e51 err

e71 err

g41 err

d5/d6 concentrate most errors. Force decisions in those zones.

Recent Games

L

Kunz, Andre2115

Titled Tue 18th Feb Early · 18 Feb 2025

1-0

L

Boci, Mateu2312

Titled Tue 18th Feb Early · 18 Feb 2025

0-1

W

Altynbek, Aiaru2005

Titled Tue 18th Feb Early · 18 Feb 2025

0-1

L

Rustemov, Alexander2525

Titled Tue 18th Feb Early · 18 Feb 2025

0-1

W

Aadya Gupta1928

Titled Tue 18th Feb Early · 18 Feb 2025

1-0

W

Auribault, Louis2203

Titled Tue 18th Feb Early · 18 Feb 2025

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Caro-Kann: Panov-Botvinnik

50.0%

8 GamesLow sample·Loses

1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Sicilian: 2...Nc6

59.1%

22 Games·Wins

1.e4 c5 2.Nf3 Nc6

French: Tarrasch

58.8%

17 Games·Wins

1.e4 e6 2.d4 d5 3.Nd2

Black

Sicilian: Najdorf

50.0%

10 Games·Wins

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

Critical Blunders

Tactical errors analyzed with Stockfish

1 errors

▶

#34Rd6??

Tactics

vs Larsen

OTB

Endgame Statistics

6 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2025

2024

2023

2021

2020

1979

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

206 Games

43%38%19%

Move	Games	Performance	%
1.e4	188		62%
1.Nf3	8		50%
1.c4 Strong	8		75%
1.d4	2		50%

1.e4

62%

188

1.Nf3

50%

8

1.c4

75%

8

1.d4

50%

2

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