Koustav Chatterjee

IND IND·Born 2003·FIDE #25073060

2484Classical

2396Rapid

2435Blitz

Statistics

Total623

Wins281

Draws212

Losses127

45%34%20%

Play Style

before facing themWhat 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 as

(72% in 92 games)

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623 games analyzed

Deep Analysis

Stockfish 18 · Classical · 347 analyzedStockfish 18 · Classical games · 347 analyzed

Accuracy by phase

Opening

96.8%

Middlegame

94.1%

Endgame

95.7%

Clutch Factor

+4%

Winning (+2)Winning (+2)

94%156g

EqualEqual position

94%131g

Losing (−2)Losing (−2)

90%60g

Accuracy under pressure

Problematic Pieces — which cause most errors?

23%

59 err

21%

54 err

21%

54 err

14%

35 err

12%

31 err

22 err

Critical Moment

Move 46 avg

1-15

26%

16-25

26%

26-35

26%

36-45

21%

46+

26% of blunders occur after move 16-25 — keep tension until then.of blunders occur after move 16-25 — keep tension until then.

Error Heatmap — where do errors occur?

Few

Many

Errors mapped

Hotspot zone

e4 / f6

Critical squares

12 err

11 err

9 err

8 err

e4/f6 concentrate most errors. Force decisions in those zones.

Openings

623 gamesBased on 623 player games

Weaknesses

— exploit these— exploit these lines

No significant weaknesses detected as white

No significant weaknesses detected as black

Strengths

— avoid these— avoid these lines

aswhite80.0%wins

Nimzo-Indian: Capablanca — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd310 g10 games · last played 2 years ago

aswhite61.1%wins

Nimzo-Indian: Rubinstein — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e318 g18 games · last played 10 months ago

asblack66.7%wins

Alekhine Defense — 1.e4 Nf6 2.e5 Nd512 g12 games · last played 9 months ago

asblack50.0%wins

French Defense — 1.e4 e6 2.d4 d510 g10 games · last played 3 years ago

Critical Blunders

10 errors · Stockfish

#30f4??Tacticsvs AtwellOTB · 2026

#17Qe7??Tacticsvs Ehsan GhaemmaghamiOTB · 2025

#15Ne4??Tacticsvs HongOTB · 2025

#28Ba4??Tacticsvs ZhouOTB · 2025

#25Rd8??Tacticsvs OzenirOTB · 2025

#112Rh4+??Endgamevs BudisavljevicOTB · 2025

#35Rxb3??Tacticsvs ColvilleOTB · 2025

#52g6??Endgamevs Avila PavasOTB · 2025

#53d3??Endgamevs NakadaOTB · 2025

#43Kd3??Endgamevs Quesada PerezOTB · 2024

Recent Games

623 games

Draw

Schitco, Ivan(2490)

NY Marshall Winter GM B · 19 Jan 2026

½-½

Draw

Ludwig, John(2344)

NY Marshall Winter GM B · 19 Jan 2026

½-½

Draw

Fus, Jakub(2422)

NY Marshall Winter GM B · 18 Jan 2026

½-½

Draw

Hebbar, Eshaan(2233)

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

½-½

Draw

Kaplan, Avi Harrison(2372)

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

½-½

Win

Lin, Bryan Enming(2372)

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

1-0

Endgame Statistics

PRO162 endgames (46%) · avoid Bishop vs Knight (11%)

Strongest

79.4%

R+Bishop vs R+Knight

Weakest

60.6%

Pure Pawn

Reaches Endgame

46%

162 / 352

B vs N Pref

52.4%·47.8%

prefers the bishop

PiecesTypeWin %games

Rook + Equal Minors

77.9%353

R+Bishop vs R+Knight

79.4%306

Rook vs Minor (Exchange)

73.7%281

Rook vs Rook

72.6%252

Rook vs Two Minors

78.1%160

Pure Pawn

60.6%109

Rook + Equal Minors77.9%353

R+Bishop vs R+Knight79.4%306

Rook vs Minor (Exchange)73.7%281

Rook vs Rook72.6%252

Rook vs Two Minors78.1%160

Pure Pawn60.6%109

Weak in Bishop vs Knight: only 11% win rate (9 games) — Force thisShow all 14 types

Unlock Endgame Statistics

14 endgame categories — discover where they collapse under pressure

Repertoire

PRO

Move arrowsmost-played moves

Starting Position

SF18

313 games

49%34%17%

Move	games	%
1.d4	153	64%
1.Nf3Strong	92	72%
1.c4	36	58%
1.e4	30	70%
1.g3	1	50%
1.b3	1	50%

MovegamesPerf%

1.d4

153

64%

1.Nf3Strong

72%

1.c4

58%

1.e4

70%

1.g3

50%

1.b3

50%