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

Vidonyak, Roman

GER GER·Born 1972·FIDE #14100622·438 Games

Classical2442438 Games

Rapid—0 Games

Blitz—0 Games

Statistics

438

Total

170

Wins

137

Draws

131

Losses

39%31%30%

Play Style

What you need to know before facing them

Plays 92.6% better with black

Very precise: only 0.0 blunders/game

Dominates 1.Nf3 ♔ (70% in 40 games)

Vulnerable to 1.Nf3 ♚ (only 33%)

Deep Analysis

Stockfish 18 · Classical games · 1 analyzed

Accuracy by phase

Opening92.6%

Middlegame98.7%

Endgame93.4%

Clutch Factor

Performance under pressure

-8%

Winning (+2 or more)85%

0 Games

Equal position85%

0 Games

Losing (-2 or more)93%

1 Games

Problematic Pieces

Which pieces cause most errors?

♞

100%

1 errors

♗

0%

0 errors

♔

0%

0 errors

♙

0%

0 errors

♕

0%

0 errors

♖

0%

0 errors

Critical Moment

When does the first serious error occur?

Move 30average

1-15

16-25

26-35

36-45

46+

Error Heatmap

Where do most errors occur?

1

abcdefgh

Many

Few

Critical squares

d71 err

Recent Games

W

Coelho, Ramyres Santana1981

Titled Tue 6th Sep Early · 6 Sept 2022

0-1

L

Rios Escobar, Adan2276

Titled Tue 6th Sep Early · 6 Sept 2022

1-0

L

Przybylski, Wojciech2321

Titled Tue 6th Sep Early · 6 Sept 2022

0-1

L

Chernomordik, Pavel2200

Titled Tue 6th Sep Early · 6 Sept 2022

0-1

L

Blomqvist, Erik2523

Titled Tue 6th Sep Early · 6 Sept 2022

1-0

L

Ferreira, Vitor Hugo Vieira2128

Titled Tue 6th Sep Early · 6 Sept 2022

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Nimzo-Indian: Rubinstein

75.0%

8 GamesLow sample·Loses

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

King's Indian

50.0%

24 Games·Loses

1.d4 Nf6 2.c4 g6

Black

Sicilian: d6 Systems

58.6%

29 Games·Loses

1.e4 c5 2.Nf3 d6

Strengths

AVOID

White

No consistent strengths detected as White

Black

Sicilian: Najdorf

57.1%

14 Games·Wins

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

Critical Blunders

Tactical errors analyzed with Stockfish

No blunders recorded

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2022

2018

2017

2016

2015

2014

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

223 Games

39%32%29%

Move	Games	Performance	%
1.d4	159		51%
1.Nf3	40		70%
1.e4	9		67%
1.c4	8		50%
1.b3 Strong	3		83%
1.b4	3		33%
1.g3	1		50%

1.d4

51%

159

1.Nf3

70%

40

1.e4

67%

9

1.c4

50%

8

1.b3

83%

3

1.b4

33%

3

1.g3

50%

1

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