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

Piorun, Kacper

POL POL·Born 1991·FIDE #1130420·3,021 Games

Classical25192,388 Games

Rapid2508357 Games

Blitz2546276 Games

Statistics

3021

Total

1383

Wins

968

Draws

669

Losses

46%32%22%

Play Style

What you need to know before facing them

Elite accuracy: 93.6% average

Solid conversion: 85%

Very consistent (90%)

Very precise: only 0.1 blunders/game

Dominates 1.g3 ♔ (84% in 22 games)

Vulnerable to 1.b3 ♔ (only 46%)

Deep Analysis

Stockfish 18 · Classical games · 631 analyzed

Accuracy by phase

Opening96.1%

Middlegame93.5%

Endgame95.4%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)94%

200 Games

Equal position96%

210 Games

Losing (-2 or more)90%

90 Games

Problematic Pieces

Which pieces cause most errors?

♕

22%

86 errors

♖

21%

83 errors

♙

16%

64 errors

♞

15%

59 errors

♗

14%

56 errors

♔

13%

50 errors

Critical Moment

When does the first serious error occur?

Move 39average

1-15

16-25

26-35

36-45

46+

32% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

15

13

10

13

17

12

12

16

10

12

abcdefgh

Many

Few

Critical squares

f417 err

e316 err

c715 err

e413 err

f613 err

f4/e3 concentrate most errors. Force decisions in those zones.

Recent Games

W

Stork, Oliver2411

Grand Prix PlusCity Blitz · 15 May 2026

0-1

L

Raczek, Krzysztof2487

Grand Prix PlusCity Blitz · 15 May 2026

1-0

L

Solodovnichenko, Yuri2511

Grand Prix PlusCity Blitz · 15 May 2026

0-1

W

Ernst, Robert2402

Grand Prix PlusCity Blitz · 15 May 2026

1-0

W

Lymar, Vladislav2302

Grand Prix PlusCity Blitz · 15 May 2026

1-0

W

Reprintsev, Alexander2288

Grand Prix PlusCity Blitz · 15 May 2026

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Sicilian: Dragon

60.0%

10 Games·Loses

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6

Caro-Kann: Advance

50.0%

8 GamesLow sample·Loses

1.e4 c6 2.d4 d5 3.e5

Black

Reti vs King's Indian

57.1%

21 Games·Loses

1.Nf3 Nf6 2.c4 g6

Strengths

AVOID

White

English: Anglo-Indian

100.0%

10 Games·Wins

1.c4 Nf6 2.g3 g6

French: Winawer

85.0%

20 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 Bb4

Black

Sicilian: d6 Systems

66.7%

27 Games·Wins

1.e4 c5 2.Nf3 d6

French: Winawer

54.2%

59 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 Bb4

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#20Nb3??

Tactics

vs Lukasiewicz

OTB·2025

▶

#11Bc1??

Tactics

vs Krasenkow

OTB·2025

▶

#38Qf7+??

Tactics

vs Janik

Rapid·2025

▶

#17Nxd8??

Tactics

vs Bartel

Rapid·2025

▶

#57g3??

Endgame

vs Zochowski

Rapid·2025

▶

#31Rb8??

Tactics

vs Tulliez

OTB·2025

▶

#45c3??

Endgame

vs Jarmula

OTB·2025

▶

#52Qa8??

Endgame

vs Lewtak

OTB·2025

▶

#47Qxe7??

Endgame

vs Socko

OTB·2025

▶

#25Bf4??

Tactics

vs Klekowski

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

1507 Games

51%29%20%

Move	Games	Performance	%
1.e4	812		66%
1.d4	317		66%
1.c4	186		66%
1.Nf3	147		66%
1.g3 Strong	22		84%
1.b3	14		46%
1.f4	6		67%
1.Nc3 Weak	1		0%
1.a3 Strong	1		100%
1.e3 Strong	1		100%

1.e4

66%

812

1.d4

66%

317

1.c4

66%

186

1.Nf3

66%

147

1.g3

84%

22

1.b3

46%

14

1.f4

67%

6

1.Nc3

0%

1

1.a3

100%

1

1.e3

100%

1

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