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

Kiselev, Vitalii

ARG ARG·Born 1988·FIDE #4194128·182 Games

Classical2507161 Games

Rapid238821 Games

Blitz24070 Games

Statistics

182

Total

90

Wins

41

Draws

51

Losses

49%23%28%

Play Style

What you need to know before facing them

Elite accuracy: 94.3% average

Very consistent (93%)

Very precise: only 0.0 blunders/game

Dominates 1.d4 ♔ (77% in 26 games)

Vulnerable to 1.d4 ♚ (only 47%)

Deep Analysis

Stockfish 18 · Classical games · 12 analyzed

Accuracy by phase

Opening95.4%

Middlegame93.9%

Endgame95.1%

Clutch Factor

Performance under pressure

+1%

Winning (+2 or more)94%

7 Games

Equal position97%

3 Games

Losing (-2 or more)92%

2 Games

Problematic Pieces

Which pieces cause most errors?

♙

27%

3 errors

♗

18%

2 errors

♞

18%

2 errors

♖

18%

2 errors

♔

9%

1 errors

♕

9%

1 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

1

1

1

2

1

1

2

1

abcdefgh

Many

Few

Critical squares

a52 err

c42 err

b11 err

b61 err

d71 err

a5/c4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Ortiz, Jorge1817

55Âº Abierto Internaciona... · 28 Mar 2026

0-1

D

Moreno Perez, Tobias Sebastian2356

55Âº Abierto Internaciona... · 28 Mar 2026

½-½

W

Leskovar, Mario2169

55Âº Abierto Internaciona... · 28 Mar 2026

1-0

W

Fischer, Pablo1959

55Âº Abierto Internaciona... · 28 Mar 2026

1-0

W

Ocampos, Ian2233

55Âº Abierto Internaciona... · 28 Mar 2026

1-0

W

Sipaila, Jorge2083

55Âº Abierto Internaciona... · 28 Mar 2026

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

Sicilian: Rossolimo

55.6%

9 GamesLow sample·Loses

1.e4 c5 2.Nf3 Nc6 3.Bb5

Strengths

AVOID

White

Sicilian: Closed

66.7%

12 Games·Wins

1.e4 c5 2.Nc3 Nc6

Black

No consistent strengths detected as Black

Critical Blunders

Tactical errors analyzed with Stockfish

1 errors

▶

#26Rxg5??

Tactics

vs Hoffman

OTB·2025

Endgame Statistics

14 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2026

2025

2024

2021

2018

2014

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

89 Games

61%12%27%

Move	Games	Performance	%
1.e4	59		60%
1.d4 Strong	26		77%
1.Nf3 Strong	3		100%
1.g3 Strong	1		100%

1.e4

60%

59

1.d4

77%

26

1.Nf3

100%

3

1.g3

100%

1

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