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

Ibarra Jerez, Jose Carlos

ESP ESP·Born 1985·FIDE #2226332·4,601 Games

Classical25334,346 Games

Rapid2535192 Games

Blitz2541111 Games

Statistics

4601

Total

2660

Wins

842

Draws

1098

Losses

58%18%24%

Play Style

What you need to know before facing them

Elite accuracy: 92.7% average

High resilience (64%): Dangerous even when losing

Solid conversion: 88%

Very consistent (87%)

Very precise: only 0.1 blunders/game

Dominates 1.Nc3 ♚ (80% in 10 games)

Vulnerable to 1.a3 ♔ (only 45%)

Deep Analysis

Stockfish 18 · Classical games · 325 analyzed

Accuracy by phase

Opening95.8%

Middlegame93.0%

Endgame94.4%

Clutch Factor

Performance under pressure

+7%

Winning (+2 or more)94%

148 Games

Equal position94%

122 Games

Losing (-2 or more)86%

55 Games

Problematic Pieces

Which pieces cause most errors?

♖

23%

75 errors

♙

17%

55 errors

♕

17%

57 errors

♗

16%

52 errors

♞

16%

54 errors

♔

12%

40 errors

Critical Moment

When does the first serious error occur?

Move 40average

1-15

16-25

26-35

36-45

46+

36% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

9

10

11

15

10

9

13

9

8

10

abcdefgh

Many

Few

Critical squares

f515 err

e413 err

e511 err

d510 err

f310 err

f5/e4 concentrate most errors. Force decisions in those zones.

Recent Games

D

Lyutsinger, Iren2232

2nd 3-0 Thu 28th May 2026 · 28 May 2026

½-½

W

Baturin-Vinogradov, Miroslav2249

2nd 3-0 Thu 28th May 2026 · 28 May 2026

1-0

W

Sakhayi, Mostafa2166

2nd 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Drygalov, Sergey2530

2nd 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Malik, Maciej2183

2nd 3-0 Thu 28th May 2026 · 28 May 2026

1-0

L

Martirosyan, Haik M.2636

2nd 3-0 Thu 28th May 2026 · 28 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Reti: KIA

56.5%

23 Games·Loses

1.Nf3 d5 2.g3 Nf6

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Sicilian: d6 Systems

59.1%

232 Games·Wins

1.e4 c5 2.Nf3 d6

Scotch: Classical

75.0%

28 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5

Black

Sicilian: e6 Systems

63.5%

285 Games·Wins

1.e4 c5 2.Nf3 e6

London System

75.0%

12 Games·Wins

1.d4 Nf6 2.Bf4 g6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#32Bd5??

Tactics

vs Gan-Erdene

Blitz·2025

▶

#86Na6??

Endgame

vs Drygalov

Blitz·2025

▶

#27Nxd4??

Tactics

vs Oro

Blitz·2025

▶

#41Qd8+??

Endgame

vs Smirnov

Blitz·2025

▶

#66Qc5??

Endgame

vs Madaminov

Blitz·2025

▶

#38Qd1??

Tactics

vs Hong

Blitz·2025

▶

#13Nxh4??

Tactics

vs Firouzja

Blitz·2025

▶

#54Ref2??

Endgame

vs Samunenkov

Blitz·2025

▶

#51Bc7??

Endgame

vs Wafa

Blitz·2025

▶

#28Nd2??

Tactics

vs Agmanov

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

2304 Games

61%17%22%

Move	Games	Performance	%
1.e4 Strong	1896		71%
1.Nf3	228		65%
1.d4	99		65%
1.c4	18		56%
1.g3	12		46%
1.Nc3	11		68%
1.a3	10		45%
1.b3	7		43%
1.e3	6		67%
1.b4 Strong	5		80%
1.d3	5		70%
1.g4	3		50%
1.f4	2		50%
1.h4 Strong	1		100%
1.Nh3 Weak	1		0%

1.e4

71%

1896

1.Nf3

65%

228

1.d4

65%

99

1.c4

56%

18

1.g3

46%

12

1.Nc3

68%

11

1.a3

45%

10

1.b3

43%

7

1.e3

67%

6

1.b4

80%

5

1.d3

70%

5

1.g4

50%

3

1.f4

50%

2

1.h4

100%

1

1.Nh3

0%

1

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