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

Iturrizaga Bonelli, Eduardo

ESP ESP·Born 1989·FIDE #3901211·3,404 Games

Classical25872,822 Games

Rapid2604284 Games

Blitz2635340 Games

Statistics

3404

Total

1749

Wins

1064

Draws

588

Losses

51%31%17%

Play Style

What you need to know before facing them

Elite accuracy: 93.3% average

High resilience (64%): Dangerous even when losing

Solid conversion: 96%

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.b3 ♔ (80% in 10 games)

Deep Analysis

Stockfish 18 · Classical games · 751 analyzed

Accuracy by phase

Opening95.9%

Middlegame93.4%

Endgame94.9%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)94%

236 Games

Equal position95%

190 Games

Losing (-2 or more)89%

74 Games

Problematic Pieces

Which pieces cause most errors?

♖

22%

78 errors

♙

19%

68 errors

♕

19%

67 errors

♞

15%

53 errors

♗

14%

48 errors

♔

11%

38 errors

Critical Moment

When does the first serious error occur?

Move 41average

1-15

16-25

26-35

36-45

46+

39% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

9

9

11

11

11

10

15

12

14

15

abcdefgh

Many

Few

Critical squares

d415 err

g415 err

f414 err

e412 err

c511 err

d4/g4 concentrate most errors. Force decisions in those zones.

Recent Games

L

Seemann, Jakub2548

TCh-AUT Rapid 2026 · 17 May 2026

1-0

W

Martinez Alcantara, Jose Eduardo2650

TCh-AUT Rapid 2026 · 17 May 2026

0-1

W

Standhartinger, Joachim2055

TCh-AUT Rapid 2026 · 17 May 2026

0-1

W

Dolzhykova, Kateryna2280

TCh-AUT Rapid 2026 · 17 May 2026

1-0

L

Perunovic, Milos2502

TCh-AUT Rapid 2026 · 17 May 2026

1-0

W

Licznerski, Lukasz2500

TCh-AUT Rapid 2026 · 17 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

English vs 1...e5

50.0%

8 GamesLow sample·Loses

1.c4 e5 2.Nc3 Bb4

Black

Nimzo-Indian: Fischer

55.6%

9 GamesLow sample·Loses

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6

Strengths

AVOID

White

Reti vs King's Indian

71.2%

73 Games·Wins

1.Nf3 Nf6 2.c4 g6

English: Anglo-Indian

62.2%

37 Games·Wins

1.c4 Nf6 2.Nc3 g6

Black

Reti: Double Fianchetto

73.7%

19 Games·Wins

1.Nf3 Nf6 2.g3 b6

Sicilian: e6 Systems

55.2%

192 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#38Qc4??

Tactics

vs Bharath Subramaniyam H

Blitz·2025

▶

#47Kh1??

Endgame

vs Oro

Blitz·2025

▶

#34Rcd8??

Tactics

vs Erdogmus

Blitz·2025

▶

#46Kxe6??

Endgame

vs Madaminov

Blitz·2025

▶

#38Qf6??

Tactics

vs Ahmad

Blitz·2025

▶

#47Bxg5??

Endgame

vs Plat

Blitz·2025

▶

#45Rd5??

Endgame

vs Pechac

Blitz·2025

▶

#17Qxc2??

Tactics

vs Saraci

Blitz·2025

▶

#47Ke5??

Endgame

vs Calleja Gonzalez

OTB·2025

▶

#24Nb6??

Tactics

vs Dardha

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

1746 Games

55%31%14%

Move	Games	Performance	%
1.c4 Strong	868		71%
1.Nf3 Strong	486		74%
1.d4	326		68%
1.e4	54		68%
1.b3 Strong	10		80%
1.g3 Weak	1		0%
1.d3 Strong	1		100%

1.c4

71%

868

1.Nf3

74%

486

1.d4

68%

326

1.e4

68%

54

1.b3

80%

10

1.g3

0%

1

1.d3

100%

1

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