GM

Koustav Chatterjee

IND IND·Born 2003·FIDE #25073060·623 Games

Classical2484614 Games
Rapid23960 Games
Blitz24359 Games

Statistics

623

Total

281

Wins

212

Draws

127

Losses

45%34%20%

Play Style

What you need to know before facing them

Elite accuracy: 93.3% average
Solid conversion: 94%
Very consistent (84%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 ♔ (72% in 92 games)

Deep Analysis

Stockfish 18 · Classical games · 345 analyzed

Accuracy by phase
Opening96.7%
Middlegame94.1%
Endgame95.7%

Clutch Factor

Performance under pressure

+4%
Winning (+2 or more)94%
156 Games
Equal position94%
130 Games
Losing (-2 or more)90%
59 Games

Problematic Pieces

Which pieces cause most errors?

♖
24%
59 errors
♕
22%
54 errors
♙
20%
50 errors
♞
14%
34 errors
♔
12%
29 errors
♗
9%
22 errors

Critical Moment

When does the first serious error occur?

Move 46average
1-15
16-25
26-35
36-45
46+
28% of blunders occur between move 16-25. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

8
10
7
8
8
11
8
9
7
7
abcdefgh
Many
Few
Critical squares
e411 err
f610 err
b39 err
e68 err
f58 err
e4/f6 concentrate most errors. Force decisions in those zones.

Recent Games

D
Schitco, Ivan2490

NY Marshall Winter GM B · 19 Jan 2026

½-½
D
Ludwig, John2344

NY Marshall Winter GM B · 19 Jan 2026

½-½
D
Fus, Jakub2422

NY Marshall Winter GM B · 18 Jan 2026

½-½
D
Hebbar, Eshaan2233

2026 NY Marshall Winter I... · 18 Jan 2026

½-½
D
Kaplan, Avi Harrison2372

2026 NY Marshall Winter I... · 17 Jan 2026

½-½
W
Lin, Bryan Enming2372

2026 NY Marshall Winter I... · 17 Jan 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
Nimzo-Indian: Capablanca
80.0%
10 Games·Wins

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3

Nimzo-Indian: Rubinstein
61.1%
18 Games·Wins

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

Black
French Defense
50.0%
10 Games·Wins

1.e4 e6 2.d4 d5

Sicilian: e6 Systems
48.0%
25 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#30f4??
Tactics
vs Atwell
OTB·2026
▶
#17Qe7??
Tactics
vs Ehsan Ghaemmaghami
OTB·2025
▶
#15Ne4??
Tactics
vs Hong
OTB·2025
▶
#28Ba4??
Tactics
vs Zhou
OTB·2025
▶
#25Rd8??
Tactics
vs Ozenir
OTB·2025
▶
#112Rh4+??
Endgame
vs Budisavljevic
OTB·2025
▶
#52g6??
Endgame
vs Avila Pavas
OTB·2025
▶
#35Rxb3??
Tactics
vs Colville
OTB·2025
▶
#53d3??
Endgame
vs Nakada
OTB·2025
▶
#43Kd3??
Endgame
vs Quesada Perez
OTB·2024
Endgame Statistics

20 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
313 Games
49%34%17%
1.d4
64%
153
1.Nf3
72%
92
1.c4
58%
36
1.e4
70%
30
1.g3
50%
1
1.b3
50%
1
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