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

Mendonca, Leon Luke

IND IND·Born 2006·FIDE #35028561·2,383 Games

Classical26052,277 Games

Rapid254448 Games

Blitz248776 Games

Statistics

2383

Total

1079

Wins

772

Draws

526

Losses

45%32%22%

Play Style

What you need to know before facing them

Elite accuracy: 93.9% average

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.b4 ♔ (83% in 24 games)

Vulnerable to 1.b3 ♚ (only 35%)

Deep Analysis

Stockfish 18 · Classical games · 1,114 analyzed

Accuracy by phase

Opening96.6%

Middlegame94.2%

Endgame95.7%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)95%

220 Games

Equal position95%

201 Games

Losing (-2 or more)90%

79 Games

Problematic Pieces

Which pieces cause most errors?

♖

21%

68 errors

♕

19%

64 errors

♗

17%

55 errors

♙

17%

55 errors

♔

15%

48 errors

♞

12%

40 errors

Critical Moment

When does the first serious error occur?

Move 36average

1-15

16-25

26-35

36-45

46+

54% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

14

10

10

11

16

10

10

14

10

9

abcdefgh

Many

Few

Critical squares

e516 err

f414 err

f614 err

d511 err

c510 err

e5/f4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Bukreev, Stanislav2385

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

0-1

D

Pranesh M2632

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

½-½

W

Javakhadze, Zurab2423

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

1-0

W

Ketzetzis, Georgios2273

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

1-0

L

Lazavik, Denis2621

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

0-1

W

Rosen, Eric2377

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

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Reti vs King's Indian

75.0%

12 Games·Wins

1.Nf3 Nf6 2.c4 g6

King's Indian: Main Line

57.1%

14 Games·Wins

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O

Black

Caro-Kann: Main Line

92.3%

13 Games·Wins

1.e4 c6 2.d4 d5 3.Nc3 dxe4

London System

70.0%

10 Games·Wins

1.d4 Nf6 2.Bf4 b6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#25Qxe2??

Tactics

vs Kakavand

Blitz·2026

▶

#44Qh5??

Endgame

vs Mayank Chakraborty

Blitz·2026

▶

#31f5??

Tactics

vs Zemlyanskii

Blitz·2025

▶

#80f2??

Endgame

vs Naiditsch

Blitz·2025

▶

#42Qa6??

Endgame

vs Sychev

Blitz·2025

▶

#82Rb1??

Endgame

vs Moussard

Blitz·2025

▶

#25Nc6??

Tactics

vs Dardha

Blitz·2025

▶

#28Rac1??

Tactics

vs Christiansen

Blitz·2025

▶

#79Rc8??

Endgame

vs Rapport

Blitz·2025

▶

#79g4??

Endgame

vs Gharibyan

Blitz·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

1201 Games

48%33%19%

Move	Games	Performance	%
1.d4	609		65%
1.Nf3	255		65%
1.e4	210		61%
1.c4	73		70%
1.b4 Strong	24		83%
1.b3 Strong	11		82%
1.a3	8		38%
1.g3 Strong	6		75%
1.c3	3		67%
1.e3 Strong	1		100%
1.f4 Weak	1		0%

1.d4

65%

609

1.Nf3

65%

255

1.e4

61%

210

1.c4

70%

73

1.b4

83%

24

1.b3

82%

11

1.a3

38%

8

1.g3

75%

6

1.c3

67%

3

1.e3

100%

1

1.f4

0%

1

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