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

Drozdowski, Kacper

POL POL·Born 1996·FIDE #1136720·1,848 Games

Classical24611,768 Games

Rapid248948 Games

Blitz249232 Games

Statistics

1848

Total

951

Wins

475

Draws

421

Losses

51%26%23%

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.b3 ♔ (73% in 11 games)

Deep Analysis

Stockfish 18 · Classical games · 14 analyzed

Accuracy by phase

Opening96.2%

Middlegame94.7%

Endgame95.0%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)96%

8 Games

Equal position95%

3 Games

Losing (-2 or more)90%

3 Games

Problematic Pieces

Which pieces cause most errors?

♞

33%

2 errors

♖

33%

2 errors

♗

17%

1 errors

♙

17%

1 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?

2

1

1

1

1

abcdefgh

Many

Few

Critical squares

e82 err

d41 err

d51 err

e31 err

f61 err

e8/d4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Rosen, Eric2377

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

1-0

W

Banerjee, Supratit2313

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

1-0

D

Fellowes, Billy2106

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

½-½

W

Malladi, Sadkrith1985

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

0-1

L

Kravtsiv, Martyn2598

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

1-0

W

Papasimakopoulos, Alexandros2348

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

Queen's Gambit Accepted

75.0%

8 GamesLow sample·Loses

1.d4 d5 2.c4 dxc4

Sicilian: 2...Nc6

54.5%

11 Games·Loses

1.e4 c5 2.Nf3 Nc6

Strengths

AVOID

White

Sicilian: d6 Systems

56.9%

153 Games·Wins

1.e4 c5 2.Nf3 d6

Italian: Giuoco Piano

66.7%

48 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5

Black

Nimzo-Indian: Rubinstein

72.7%

11 Games·Wins

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

Sicilian: e6 Systems

46.9%

241 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

1 errors

▶

#32Rf6??

Tactics

vs Fier

OTB·2024

Endgame Statistics

10 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

925 Games

56%26%18%

Move	Games	Performance	%
1.e4	807		69%
1.d4	57		58%
1.c4	36		63%
1.Nf3	13		69%
1.b3 Strong	11		73%
1.g3 Strong	1		100%

1.e4

69%

807

1.d4

58%

57

1.c4

63%

36

1.Nf3

69%

13

1.b3

73%

11

1.g3

100%

1

🍪 Cookies · Chess Stalker uses technical cookies (required for operation) and analytical cookies (to improve the service). Analytical cookies are optional.