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

Steinberg, Nitzan

ISR ISR·Born 1998·FIDE #2801795·1,940 Games

Classical25561,853 Games

Rapid250938 Games

Blitz248849 Games

Statistics

1940

Total

1058

Wins

344

Draws

538

Losses

55%18%28%

Play Style

What you need to know before facing them

Elite accuracy: 93.6% average

Solid conversion: 86%

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.d4 ♔ (82% in 105 games)

Deep Analysis

Stockfish 18 · Classical games · 178 analyzed

Accuracy by phase

Opening97.0%

Middlegame93.8%

Endgame95.2%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

81 Games

Equal position95%

66 Games

Losing (-2 or more)89%

31 Games

Problematic Pieces

Which pieces cause most errors?

♙

26%

35 errors

♖

21%

28 errors

♕

19%

25 errors

♞

14%

18 errors

♗

11%

14 errors

♔

10%

13 errors

Critical Moment

When does the first serious error occur?

Move 43average

1-15

16-25

26-35

36-45

46+

44% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

6

5

7

6

4

5

4

6

5

6

abcdefgh

Many

Few

Critical squares

f57 err

c16 err

f36 err

f66 err

h56 err

f5/c1 concentrate most errors. Force decisions in those zones.

Recent Games

L

Bortnyk, Olexandr2604

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

0-1

W

Haug, Havard2422

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

0-1

L

Lazavik, Denis2605

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

1-0

W

Ghoreishi Amiri, Seyed Kian2299

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

0-1

D

Avramidou, Anastasia2310

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

½-½

W

Terry, Renato2508

1st 3-0 Thu 30th Apr 2026 · 30 Apr 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

French: Classical

62.5%

8 GamesLow sample·Loses

1.e4 e6 2.d4 d5 3.Nc3 Nf6

Sicilian: Rossolimo

44.4%

18 Games·Loses

1.e4 c5 2.Nf3 Nc6 3.Bb5

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Petroff: Main Line

82.4%

17 Games·Wins

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6

Reti: Double Fianchetto

82.4%

17 Games·Wins

1.Nf3 Nf6 2.g3 g6

Black

King's Indian: Classical

82.4%

17 Games·Wins

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2

King's Indian: Main Line

80.0%

15 Games·Wins

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

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#36Rc1??

Tactics

vs Finkel

OTB·2026

▶

#33Ke5??

Tactics

vs Dinesh Rajan M

OTB·2025

▶

#22Qc6??

Tactics

vs Harikrishna

OTB·2025

▶

#35Rxf6??

Tactics

vs Giri

OTB·2025

▶

#60Rg4??

Endgame

vs Willow

OTB·2025

▶

#22b4??

Tactics

vs Mhango

OTB·2025

▶

#44Ne4??

Endgame

vs Sevian

OTB·2025

▶

#32Nfh3??

Tactics

vs Villiers

OTB·2025

▶

#47Rf7??

Endgame

vs Cuenca Jimenez

Rapid·2025

▶

#30cxd3??

Tactics

vs Krivenko

Rapid·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

989 Games

58%19%23%

Move	Games	Performance	%
1.e4	731		64%
1.Nf3 Strong	142		80%
1.d4 Strong	105		82%
1.c4	11		68%

1.e4

64%

731

1.Nf3

80%

142

1.d4

82%

105

1.c4

68%

11

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