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

IM

Di Berardino, Diego Rafael

BRA BRA·Born 1987·FIDE #2105446·2,230 Games

Classical24652,172 Games

Rapid243818 Games

Blitz241740 Games

Statistics

2230

Total

1159

Wins

489

Draws

581

Losses

52%22%26%

Play Style

What you need to know before facing them

Elite accuracy: 92.5% average

Solid conversion: 88%

Very precise: only 0.1 blunders/game

Dominates 1.Nf3 ♔ (86% in 46 games)

Deep Analysis

Stockfish 18 · Classical games · 446 analyzed

Accuracy by phase

Opening96.6%

Middlegame93.4%

Endgame95.2%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)93%

234 Games

Equal position93%

140 Games

Losing (-2 or more)89%

72 Games

Problematic Pieces

Which pieces cause most errors?

♖

26%

95 errors

♕

19%

72 errors

♙

18%

68 errors

♗

16%

58 errors

♞

12%

43 errors

♔

9%

35 errors

Critical Moment

When does the first serious error occur?

Move 34average

1-15

16-25

26-35

36-45

46+

36% of blunders occur between move 16-25. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

10

12

13

10

9

8

12

16

9

9

abcdefgh

Many

Few

Critical squares

f416 err

d513 err

c512 err

e412 err

e510 err

f4/d5 concentrate most errors. Force decisions in those zones.

Recent Games

D

Gontcharov, Vladislav2421

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

½-½

L

Pranav,V2657

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

0-1

W

Petcu, Gabriel2323

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

1-0

W

Brown, Akeem2060

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

1-0

L

Verkholantcev, Andrei2204

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

0-1

L

Ganiev, Artur2371

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

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

King's Indian: Saemisch

69.2%

13 Games·Wins

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3

Ruy Lopez: Morphy

63.6%

55 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6

Black

Reti vs King's Indian

72.7%

11 Games·Wins

1.Nf3 Nf6 2.c4 g6

Reti: Double Fianchetto

69.2%

13 Games·Wins

1.Nf3 Nf6 2.g3 g6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#32Qe8??

Tactics

vs Guimaraes

OTB·2025

▶

#17Bc4??

Tactics

vs Umetsubo

OTB·2025

▶

#41Qg4??

Endgame

vs Kayser

OTB·2025

▶

#26Qb3??

Tactics

vs Guerrero

OTB·2025

▶

#39Nf6??

Tactics

vs Gomez

OTB·2025

▶

#35Kg3??

Tactics

vs Ticona Rocabado

OTB·2025

▶

#23Ra8??

Tactics

vs Toth

OTB·2025

▶

#37Kg7??

Tactics

vs Fier

OTB·2025

▶

#36Rh8??

Tactics

vs Silva

OTB·2025

▶

#38Qc5??

Tactics

vs Quintiliano

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

1108 Games

54%22%24%

Move	Games	Performance	%
1.e4	587		66%
1.d4	445		61%
1.Nf3 Strong	46		86%
1.c4 Strong	30		82%

1.e4

66%

587

1.d4

61%

445

1.Nf3

86%

46

1.c4

82%

30

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