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

Kourkoulos-Arditis, Stamatis

GRE GRE·Born 1998·FIDE #4221990·1,852 Games

Classical25701,774 Games

Rapid246937 Games

Blitz246441 Games

Statistics

1852

Total

965

Wins

359

Draws

528

Losses

52%19%29%

Play Style

What you need to know before facing them

Elite accuracy: 94.3% average

High resilience (66%): Dangerous even when losing

Solid conversion: 96%

Very consistent (91%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♔ (72% in 23 games)

Deep Analysis

Stockfish 18 · Classical games · 397 analyzed

Accuracy by phase

Opening96.8%

Middlegame94.3%

Endgame95.9%

Clutch Factor

Performance under pressure

+4%

Winning (+2 or more)95%

194 Games

Equal position95%

144 Games

Losing (-2 or more)91%

59 Games

Problematic Pieces

Which pieces cause most errors?

♖

22%

54 errors

♙

18%

45 errors

♕

18%

46 errors

♗

15%

37 errors

♞

14%

36 errors

♔

12%

31 errors

Critical Moment

When does the first serious error occur?

Move 40average

1-15

16-25

26-35

36-45

46+

50% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

8

8

8

8

11

11

8

7

8

8

abcdefgh

Many

Few

Critical squares

d411 err

f511 err

c28 err

c88 err

d58 err

d4/f5 concentrate most errors. Force decisions in those zones.

Recent Games

L

Pranav,V2657

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

1-0

W

Shuvalov, Evgenij2008

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

1-0

W

Zhigalko, Sergei2572

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

1-0

W

Nguyen Tung Quan2197

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

0-1

W

Lyutsinger, Iren2232

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

0-1

W

Mnatsakanyan, Aren2207

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

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Petroff: Steinitz Attack

62.5%

8 GamesLow sample·Loses

1.e4 e5 2.Nf3 Nf6 3.d4

Sicilian: Rossolimo

41.2%

17 Games·Loses

1.e4 c5 2.Nf3 Nc6 3.Bb5

Black

Sicilian: Najdorf

66.7%

9 GamesLow sample·Loses

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

Nimzo-Indian: Classical

55.6%

9 GamesLow sample·Loses

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

Strengths

AVOID

White

Ruy Lopez: Closed

78.6%

14 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7

Sicilian: e6 Systems

75.8%

33 Games·Wins

1.e4 c5 2.Nf3 e6

Black

Reti: KIA

73.3%

15 Games·Wins

1.Nf3 d5 2.g3 b6

Sicilian: e6 Systems

49.0%

100 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#35gxf5??

Tactics

vs Alexakis

OTB·2025

▶

#42Rd5??

Endgame

vs Grebnev

OTB·2025

▶

#35Ng5??

Tactics

vs Grigorov

Blitz·2025

▶

#36Rc3??

Tactics

vs Karamichos

Rapid·2025

▶

#77Kb4??

Endgame

vs Skembris

Rapid·2025

▶

#54Nf2??

Endgame

vs Halkias

Blitz·2025

▶

#29Qe6??

Tactics

vs Alexandri

Blitz·2025

▶

#52h5??

Endgame

vs Demirtzoglou

Blitz·2025

▶

#46h5??

Endgame

vs Papasimakopoulos

Blitz·2025

▶

#33Nh7??

Tactics

vs Krallis

Blitz·2025

Endgame Statistics

21 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

943 Games

57%19%24%

Move	Games	Performance	%
1.e4	451		67%
1.d4	234		67%
1.Nf3	153		66%
1.b3	79		66%
1.c4 Strong	23		72%
1.f4	2		50%
1.b4 Weak	1		0%

1.e4

67%

451

1.d4

67%

234

1.Nf3

66%

153

1.b3

66%

79

1.c4

72%

23

1.f4

50%

2

1.b4

0%

1

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