Player profile

Koustav Chatterjee

Standard: 2473 Rapid: 2396 Blitz: 2431 (last updated 2026-11-02)

FIDE ID: 25073060 (view FIDE profile)

Federation: IND Sex: M Birth Year: 2003 Age: 23

Title: GM Women's title: — Other title: — FOA title: —

Games: 134 Wins: 54 (40%) Draws: 59 (44%) Losses: 19 (14%) Other: 2

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Dossier

130 of 134 games analyzed.

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Openings

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As White 59 games 27W 25D 7L

King's Indian Defense 11 games 7W 4D 0L

Normal Variation 5 games 3W 2D 0L

King's Knight Variation 4 games 3W 1D 0L

Rare Defenses 1 game 0W 1D 0L

Orthodox Variation 4 games 2W 2D 0L

Glek Defense 2 games 1W 1D 0L

Bayonet Attack 1 game 0W 1D 0L

(unspecified) 1 game 1W 0D 0L

Fianchetto Variation 1 game 1W 0D 0L

Panno Variation 1 game 1W 0D 0L

Semi-Classical Variation 1 game 1W 0D 0L

Hollywood Variation 1 game 1W 0D 0L

Zukertort Opening 8 games 6W 2D 0L

(unspecified) 8 games 6W 2D 0L

Nimzo-Indian Defense 6 games 3W 1D 2L

Normal Variation 6 games 3W 1D 2L

Botvinnik System 4 games 3W 1D 0L

Schlechter Defense 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

English Opening 5 games 4W 1D 0L

Anglo-Indian Defense 4 games 3W 1D 0L

King's Knight Variation 4 games 3W 1D 0L

Agincourt Defense 1 game 1W 0D 0L

Neo-Catalan Declined 1 game 1W 0D 0L

Queen's Gambit Declined 5 games 2W 2D 1L

(unspecified) 2 games 1W 1D 0L

Exchange Variation 2 games 1W 0D 1L

Positional Variation 2 games 1W 0D 1L

Janowski Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Catalan Opening 4 games 0W 3D 1L

Open Defense 3 games 0W 2D 1L

Classical Line 2 games 0W 1D 1L

(unspecified) 1 game 0W 1D 0L

King's Indian Attack 4 games 0W 3D 1L

Keres Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Yugoslav Variation 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

Symmetrical Defense 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Sicilian Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Tarrasch Defense 3 games 1W 2D 0L

Symmetrical Variation 2 games 1W 1D 0L

(unspecified) 2 games 1W 1D 0L

Classical Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Sicilian Defense 3 games 1W 2D 0L

French Variation 1 game 0W 1D 0L

Westerinen Attack 1 game 0W 1D 0L

Moscow Variation 1 game 0W 1D 0L

Main Line 1 game 0W 1D 0L

Nyezhmetdinov-Rossolimo Attack 1 game 1W 0D 0L

Fianchetto Variation 1 game 1W 0D 0L

Semi-Slav Defense 2 games 1W 0D 1L

Quiet Variation 1 game 1W 0D 0L

(unspecified) 1 game 1W 0D 0L

Chigorin Defense 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

Réti Opening 2 games 1W 1D 0L

Anglo-Slav Variation 2 games 1W 1D 0L

Gurevich System 2 games 1W 1D 0L

Italian Game 1 game 0W 1D 0L

Giuoco Pianissimo 1 game 0W 1D 0L

Italian Four Knights Variation 1 game 0W 1D 0L

Grünfeld Defense 1 game 0W 1D 0L

Stockholm Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Benoni Defense 1 game 0W 1D 0L

Fianchetto Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Old Indian Defense 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Slav Defense 1 game 0W 0D 1L

Breyer Variation 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

Caro-Kann Defense 1 game 1W 0D 0L

Advance Variation 1 game 1W 0D 0L

Botvinnik-Carls Defense 1 game 1W 0D 0L

As Black 55 games 19W 27D 8L

Italian Game 11 games 6W 5D 0L

Classical Variation 7 games 2W 5D 0L

Giuoco Pianissimo 6 games 2W 4D 0L

Giuoco Pianissimo, with a4 a5 1 game 0W 1D 0L

Evans Gambit 2 games 2W 0D 0L

Leonhardt Countergambit 1 game 1W 0D 0L

Tartakower Attack 1 game 1W 0D 0L

Giuoco Pianissimo 2 games 2W 0D 0L

Normal 2 games 2W 0D 0L

Queen's Gambit Declined 11 games 4W 5D 2L

Ragozin Defense 7 games 2W 4D 1L

(unspecified) 6 games 2W 3D 1L

Alekhine Variation 1 game 0W 1D 0L

Exchange Variation 3 games 2W 1D 0L

Positional Variation 3 games 2W 1D 0L

Barmen Variation 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

Ruy Lopez 10 games 2W 6D 1L

Closed 6 games 1W 3D 1L

Anti-Marshall 4 games 1W 1D 1L

(unspecified) 2 games 0W 2D 0L

Morphy Defense 2 games 1W 1D 0L

Anderssen Variation 1 game 0W 1D 0L

Classical Defense Deferred 1 game 1W 0D 0L

Classical Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Exchange Variation 1 game 0W 1D 0L

King's Bishop Variation 1 game 0W 1D 0L

Queen's Pawn Game 3 games 1W 2D 0L

Colle System 2 games 1W 1D 0L

Traditional Colle 1 game 1W 0D 0L

(unspecified) 1 game 0W 1D 0L

Torre Attack 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

English Opening 3 games 0W 1D 2L

Agincourt Defense 1 game 0W 0D 1L

Neo-Catalan Declined 1 game 0W 0D 1L

Neo-Catalan 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

King's English Variation 1 game 0W 0D 1L

Two Knights Variation, Smyslov System 1 game 0W 0D 1L

Four Knights Game 2 games 0W 1D 1L

Naroditsky Variation 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

Scotch Variation Accepted 1 game 0W 1D 0L

Main Line 1 game 0W 1D 0L

Catalan Opening 2 games 0W 2D 0L

Open Defense 1 game 0W 1D 0L

Classical Line 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Indian Defense 2 games 1W 0D 1L

Anti-Nimzo-Indian 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

London System 1 game 1W 0D 0L

(unspecified) 1 game 1W 0D 0L

Nimzo-Indian Defense 2 games 0W 2D 0L

Classical Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Normal Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Three Knights Opening 1 game 1W 0D 0L

Schlechter Variation 1 game 1W 0D 0L

(unspecified) 1 game 1W 0D 0L

Vienna Game 1 game 0W 1D 0L

Vienna Gambit 1 game 0W 1D 0L

Bardeleben Variation 1 game 0W 1D 0L

Alekhine Defense 1 game 1W 0D 0L

Modern Variation 1 game 1W 0D 0L

Schmid Variation 1 game 1W 0D 0L

Bogo-Indian Defense 1 game 1W 0D 0L

Retreat Variation 1 game 1W 0D 0L

(unspecified) 1 game 1W 0D 0L

Scotch Game 1 game 0W 1D 0L

Tartakower Variation 1 game 0W 1D 0L

(unspecified) 1 game 0W 1D 0L

Semi-Slav Defense 1 game 0W 0D 1L

(unspecified) 1 game 0W 0D 1L

French Defense 1 game 0W 1D 0L

Tarrasch Variation 1 game 0W 1D 0L

Open System, Euwe-Keres Line 1 game 0W 1D 0L

King's Indian Defense 1 game 1W 0D 0L

Orthodox Variation 1 game 1W 0D 0L

Aronin-Taimanov Defense 1 game 1W 0D 0L

King's Indian Attack 1 game 1W 0D 0L

(unspecified) 1 game 1W 0D 0L

Blunders Top 4 of 272

This player's costliest moves in analyzed games. Can you find the winning move?

2026.01.15 · 30... f4 (−45.7% win chance) 1/2-1/2

Koustav Chatterjee

Atwell, Rose

Engine View game

2025.11.30 · 28... Ba4 (−41.3% win chance) 1/2-1/2

Koustav Chatterjee

Zhou, Jianchao

Engine View game

2026.05.02 · 46... Rxb3 (−39.1% win chance) 1-0

Koustav Chatterjee

Kacharava, Nikolozi

Engine View game

2024.07.24 · 32... Rf6 (−35.6% win chance) 1/2-1/2

Koustav Chatterjee

Rosen, Eric

Engine View game

View blunders & mistakes

Games Showing all 134 games

Date	Event	Round	Opponent	Result	Accuracy %	First moves
2026.09.07	Round 9: Koustav Chatterjee - Sethuraman, Sandeep	9.3	2026.09.07 Sethuraman, Sandeep (30941091) (2464)	½	99.50%	1. d4 d5 2. c4 e6 3. Nf3 Nf6
2026.09.07	Round 8: Sheehan, Ethan - Koustav Chatterjee	8.3	2026.09.07 Sheehan, Ethan (30943965) (2386)	0	91.10%	1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6
2026.09.07	Round 7: Koustav Chatterjee - Altman, Joshua	7.4	2026.09.07 Altman, Joshua (426210) (2248)	1	98.60%	1. Nf3 d5 2. e3 c5 3. b3 a6
2026.09.06	Round 6: Jiang, Andrew - Koustav Chatterjee	6.2	2026.09.06 Jiang, Andrew (30953510) (2294)	½	97.80%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2026.09.05	Round 5: Koustav Chatterjee - Amburgy, Ryan	5.5	2026.09.05 Amburgy, Ryan (30924820) (2288)	½	98.40%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2026.09.05	Round 4: Schitco, Ivan - Koustav Chatterjee	4.3	2026.09.05 Schitco, Ivan (13905465) (2498)	½	98.80%	1. d4 Nf6 2. c4 e6 3. g3 d5
2026.09.04	Round 3: Luger, Sam - Koustav Chatterjee	3.5	2026.09.04 Luger, Sam (30985773) (2320)	0	86.90%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2026.09.04	Round 2: Koustav Chatterjee - Stremavicius, Titas	2.2	2026.09.04 Stremavicius, Titas (12804444) (2554)	½	99.50%	1. d4 d5 2. c4 e6 3. Nf3 Nf6
2026.09.03	Round 1: Wang, Tianqi - Koustav Chatterjee	1.5	2026.09.03 Wang, Tianqi (2063824) (2363)	1	95.30%	1. d4 e6 2. Nf3 c5 3. e3 Nf6
2026.08.09	Finals \| Tiebreaks: Koustav Chatterjee - Isanzhulov, Arystan	13.3	2026.08.09 Isanzhulov, Arystan (13711644) (2385)	0	79.00%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2026.08.09	Finals \| Game 2: Koustav Chatterjee - Isanzhulov, Arystan	12.7	2026.08.09 Isanzhulov, Arystan (13711644) (2385)	0	92.70%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2026.08.09	Finals \| Game 1: Kamalidenova, Meruert - Koustav Chatterjee	11.7	2026.08.09 Kamalidenova, Meruert (13712802) (2400)	1	97.00%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2026.08.08	Semifinals \| Game 2: Gazik, Viktor - Koustav Chatterjee	10.7	2026.08.08 Gazik, Viktor (14928752) (2549)	½	97.70%	1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5
2026.08.08	Semifinals \| Game 1: Koustav Chatterjee - Kacharava, Nikolozi	9.7	2026.08.08 Kacharava, Nikolozi (13611860) (2521)	0	84.30%	1. d4 d5 2. c4 e6 3. Nf3 Nf6
2026.08.07	Quarterfinals \| Game 2: Koustav Chatterjee - Mariano, Fabian Glen	8.11	2026.08.07 Mariano, Fabian Glen (7129041) (2312)	½	96.70%	1. d4 Nf6 2. c4 g6 3. Nc3 d5
2026.08.07	Quarterfinals \| Game 1: Ulhaq, Zacky Dhia - Koustav Chatterjee	7.11	2026.08.07 Ulhaq, Zacky Dhia (7125674) (2338)	½	99.40%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2026.08.06	Round 3 \| Game 1: Alimbetov, Dias - Koustav Chatterjee	5.22	2026.08.06 Alimbetov, Dias (13712985) (2149)	1	93.00%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2026.08.05	Round 2 \| Game 2: Koustav Chatterjee - Tsarsitalidis, Konstantinos	4.19	2026.08.05 Tsarsitalidis, Konstantinos (4298748) (2275)	1	90.00%	1. Nf3 d5 2. d4 Nf6 3. e3 e6
2026.08.05	Round 2 \| Game 1: Tsarsitalidis, Konstantinos - Koustav Chatterjee	3.19	2026.08.05 Tsarsitalidis, Konstantinos (4298748) (2275)	1	93.30%	1. e4 e5 2. Nf3 Nc6 3. Nc3 Bb4
2026.08.04	Round 1 \| Game 2: Koustav Chatterjee - Arjun Gupta	2.19	2026.08.04 Arjun Gupta (25660349) (1959)	1	96.80%	1. Nf3 Nf6 2. c4 g6 3. g3 Bg7
2026.08.04	FIDE World University Teams Championship (OVER-THE-BOARD FINALS)	1.19	2026.08.04 Arjun Gupta (25660349) (1959)	1	93.70%	1. d4 Nf6 2. Nf3 e6 3. Bf4 Be7
2026.05.17	rated rapid game	-	2026.05.17 Rhea Mohapatra (35070380) (1584)	1	-
2026.05.16	rated rapid game	-	2026.05.16 Young, Cohen (4317440) (2070)	1	96.60%	1. Nf3 Nf6 2. c4 e6 3. Nc3 d5
2026.05.16	rated rapid game	-	2026.05.16 Young, Cohen (4317440) (2070)	1	96.20%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2026.05.02	rated rapid game	-	2026.05.02 Mukhametkali, Merey (13727389) (1921)	1	96.70%	1. Nf3 Nf6 2. c4 g6 3. d4 Bg7
2026.05.02	rated rapid game	-	2026.05.02 Kacharava, Nikolozi (13611860) (2528)	0	86.10%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2026.05.02	rated rapid game	-	2026.05.02 Rodrigue-Lemieux, Shawn (2620049) (2533)	½	94.00%	1. d4 Nf6 2. c4 g6 3. Nf3 Bg7
2026.05.02	rated rapid game	-	2026.05.02 Sargsyan, Anna M. (13308130) (2360)	1	95.10%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2026.05.02	rated rapid game	-	2026.05.02 Orrego Palermo, Marcelo (3433722) (2082)	1	91.80%	1. Nf3 d5 2. e3 Nf6 3. c4 c6
2026.05.02	rated rapid game	-	2026.05.02 Mudodo, Refiloe Hazel (11000821) (1807)	1	98.70%	1. Nf3 Nf6 2. c4 e6 3. Nc3 d5
2026.01.19	Round 9: Schitco, Ivan - Koustav Chatterjee	9.4	2026.01.19 Schitco, Ivan (13905465) (2490)	½	98.10%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2026.01.19	Round 8: Koustav Chatterjee - Ludwig, John	8.3	2026.01.19 Ludwig, John (2075512) (2344)	½	98.30%	1. Nf3 d5 2. g3 Bg4 3. Bg2 c6
2026.01.18	Round 7: Fus, Jakub - Koustav Chatterjee	7.3	2026.01.18 Fus, Jakub (1193023) (2422)	½	96.10%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2026.01.18	Round 6: Koustav Chatterjee - Hebbar, Eshaan	6.4	2026.01.18 Hebbar, Eshaan (30974690) (2233)	½	96.30%	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2026.01.17	Round 5: Kaplan, Avi Harrison - Koustav Chatterjee	5.2	2026.01.17 Kaplan, Avi Harrison (30934559) (2372)	½	98.70%	1. d4 Nf6 2. c4 e6 3. Nc3 d5
2026.01.17	Round 4: Koustav Chatterjee - Lin, Bryan Enming	4.5	2026.01.17 Lin, Bryan Enming (30987121) (2340)	1	95.30%	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2026.01.15	Round 2: Atwell, Rose - Koustav Chatterjee	2.5	2026.01.15 Atwell, Rose (30951011) (2290)	½	82.50%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2026.01.14	Round 3: Koustav Chatterjee - Lenderman, Aleksandr	3.1	2026.01.14 Lenderman, Aleksandr (2021285) (2468)	½	98.20%	1. Nf3 d5 2. e3 Nf6 3. c4 e6
2026.01.14	Round 1: Koustav Chatterjee - De Silva, L M S T	1.2	2026.01.14 De Silva, L M S T (9953698) (2404)	½	98.20%	1. d4 d5 2. c4 e6 3. Nc3 a6
2026.01.05	Round 6: Koustav Chatterjee - Zhang, Samuel	6.16	2026.01.05 Zhang, Samuel (30942993) (2115)	½	87.20%	1. Nf3 Nf6 2. c4 e6 3. Nc3 d5
2026.01.04	Round 5: Koustav Chatterjee - Shen, Christopher	5.12	2026.01.04 Shen, Christopher (2090635) (2338)	½	93.70%	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2026.01.04	Round 4: Guha, Rohit - Koustav Chatterjee	4.16	2026.01.04 Guha, Rohit (150036720) (2130)	1	91.60%	1. d4 Nf6 2. c4 e6 3. Nc3 d5
2026.01.03	Round 3: Koustav Chatterjee - Sonis, Francesco	3.4	2026.01.03 Sonis, Francesco (895733) (2557)	½	98.20%	1. d4 Nf6 2. c4 e6 3. g3 Bb4+
2026.01.03	Round 2: Beh, Ryan M - Koustav Chatterjee	2.16	2026.01.03 Beh, Ryan M (30980208) (1822)	1	91.20%	1. d4 Nf6 2. c4 e6 3. Nc3 d5
2026.01.03	Round 1: Koustav Chatterjee - Shinn, Jungmin	1.16	2026.01.03 Shinn, Jungmin (329218666) (1952)	1	91.00%	1. Nf3 Nf6 2. c4 e6 3. Nc3 d5
2025.12.30	Round 9: Koustav Chatterjee - Alexander Katz	9.4	2025.12.30 Alexander Katz	½	98.80%	1. Nf3 Nf6 2. g3 d5 3. Bg2 c5
2025.12.29	Round 8: Abdurakhmonov, Mukhammadali - Koustav Chatterjee	8.2	2025.12.29 Abdurakhmonov, Mukhammadali (14207346) (2354)	½	77.90%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2025.12.28	Round 5: Koustav Chatterjee - Lamaze, Simon	5.3	2025.12.28 Lamaze, Simon (36069264) (2466)	1	-	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2025.12.28	Round 4: Isaac Wang - Koustav Chatterjee	4.8	2025.12.28 Isaac Wang	1	94.70%	1. d4 Nf6 2. c4 e6 3. Nc3 d5
2025.12.27	35th annual North American Open	3.12	2025.12.27 Caglar, Sila (6364063) (2280)	1	98.30%	1. d4 d5 2. c4 e6 3. Nf3 h6
2025.12.27	Round 2: Ryan Yang - Koustav Chatterjee	2.8	2025.12.27 Ryan Yang	½	-	1. e4 e5 2. Nc3 Nf6 3. f4 d5
2025.12.26	Round 7: Koustav Chatterjee - Abdisalimov, Abdimalik	7.1	2025.12.26 Abdisalimov, Abdimalik (14206323) (2561)	½	97.40%	1. d4 Nf6 2. c4 e6 3. g3 c5
2025.12.26	Round 6: Ehsan Ghaemmaghami - Koustav Chatterjee	6.1	2025.12.26 Ehsan Ghaemmaghami	½	68.10%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2025.11.30	Round 9: Koustav Chatterjee - Erenburg, Sergey	9.17	2025.11.30 Erenburg, Sergey (2805642) (2466)	½	94.50%	1. Nf3 d5 2. e3 Nf6 3. c4 c6
2025.11.30	Round 8: Zhou, Jianchao - Koustav Chatterjee	8.8	2025.11.30 Zhou, Jianchao (8603537) (2591)	½	76.60%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2025.11.30	Round 7: Rodrigue-Lemieux, Shawn - Koustav Chatterjee	7.3	2025.11.30 Rodrigue-Lemieux, Shawn (2620049) (2521)	0	-	1. c4 e6 2. g3 d5 3. Bg2 Nf6
2025.11.28	Round 4: Brodsky, David - Koustav Chatterjee	4.4	2025.11.28 Brodsky, David (2073250) (2515)	1	94.80%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2025.11.27	Round 2: Mcconnell, Sullivan - Koustav Chatterjee	2.24	2025.11.27 Mcconnell, Sullivan (30934885) (2258)	1	96.10%	1. e4 Nf6 2. e5 Nd5 3. d4 d6
2025.11.26	Round 1: Koustav Chatterjee - Crump, Alexander J	1.30	2025.11.26 Crump, Alexander J (2063662) (2119)	1	98.30%	1. Nf3 d5 2. e3 Nf6 3. c4 c6
2025.11.24	Round 6: Koustav Chatterjee - Hong, Andrew	6.1	2025.11.24 Hong, Andrew (2099438) (2568)	½	87.60%	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2025.11.24	Round 5: Koustav Chatterjee - Xiong, Jeffery	5.1	2025.11.24 Xiong, Jeffery (2047640) (2649)	½	96.90%	1. d4 d5 2. c4 e6 3. Nf3 c6
2025.04.06	Round 3: Cardoso Cardoso, Jose Gabriel - Koustav Chatterjee	3.7	2025.04.06 Cardoso Cardoso, Jose Gabriel (4430492) (2505)	0	87.70%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2025.01.05	Round 6: Tiglon, Bryce - Koustav Chatterjee	6.6	2025.01.05 Tiglon, Bryce (2087456) (2530)	½	93.40%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2025.01.04	Round 4: Nakada, Akira - Koustav Chatterjee	4.17	2025.01.04 Nakada, Akira (30903920) (2420)	½	89.90%	1. Nf3 d5 2. c4 e6 3. g3 Nf6
2025.01.03	Round 3: Dudin, Gleb - Koustav Chatterjee	3.10	2025.01.03 Dudin, Gleb (34184934) (2516)	0	90.50%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2024.09.03	Round 9: Koustav Chatterjee - Montes Orozco, Miguel Angel	9.7	2024.09.03 Montes Orozco, Miguel Angel (5159989) (2219)	1	98.00%	1. Nf3 d5 2. g3 Nf6 3. Bg2 e6
2024.09.03	Round 8: Gongora Montes, Benjamin - Koustav Chatterjee	8.8	2024.09.03 Gongora Montes, Benjamin (5102987) (2096)	½	94.50%	1. d4 Nf6 2. Nf3 d5 3. Bg5 c5
2024.09.02	Round 7: Koustav Chatterjee - Quesada Perez, Yasser	7.2	2024.09.02 Quesada Perez, Yasser (3509362) (2581)	0	83.50%	1. Nf3 Nf6 2. g3 d5 3. Bg2 c6
2024.09.02	Round 6: Delgado Ramirez, Neuris - Koustav Chatterjee	6.5	2024.09.02 Delgado Ramirez, Neuris (3503631) (2484)	½	96.60%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2024.09.01	Round 5: Koustav Chatterjee - Macovei, Andrei	5.4	2024.09.01 Macovei, Andrei (13904680) (2464)	½	98.70%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2024.09.01	Round 4: Guo, Andrew - Koustav Chatterjee	4.7	2024.09.01 Guo, Andrew (30952719) (2229)	1	97.30%	1. d4 Nf6 2. c4 e6 3. g3 d5
2024.08.31	Round 3: Koustav Chatterjee - Garcia Guerrero, Isaac Antonio	3.6	2024.08.31 Garcia Guerrero, Isaac Antonio (5110475) (2291)	½	97.10%	1. Nf3 d5 2. e3 Nf6 3. c4 e6
2024.08.31	Round 2: Sivakumar, Shaaketh - Koustav Chatterjee	2.5	2024.08.31 Sivakumar, Shaaketh (30940176) (2307)	½	96.10%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2024.08.30	Round 1: Koustav Chatterjee - Guo, Ethan	1.6	2024.08.30 Guo, Ethan (30976359) (2189)	1	95.40%	1. Nf3 Nf6 2. c4 g6 3. d4 Bg7
2024.08.03	SixDays Budapest July GM B	9.3	2024.08.03 Pribelszky, Bence (769738) (2368)	½	98.20%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2024.08.02	SixDays Budapest July GM B	8.4	2024.08.02 Yip, Carissa (2090732) (2387)	1	97.30%	1. d4 Nf6 2. c4 g6 3. Nf3 Bg7
2024.08.02	SixDays Budapest July GM B	7.2	2024.08.02 Ezra Paul Chambers (20300204) (2339)	1	95.70%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2024.08.01	SixDays Budapest July GM B	6.5	2024.08.01 Gedajlovic, Max (2616840) (2378)	1	94.10%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2024.07.31	SixDays Budapest July GM B	5.1	2024.07.31 Li, Guohao (8619999) (2363)	½	90.40%	1. Nf3 d5 2. e3 Nf6 3. c4 c6
2024.07.31	SixDays Budapest July GM B	4.5	2024.07.31 Pacher, Milan (14907445) (2384)	½	95.70%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2024.07.30	SixDays Budapest July GM B	3.2	2024.07.30 Fodor, Tamas Jr. (723762) (2494)	0	90.80%	1. d4 d5 2. c4 e6 3. Nc3 c6
2024.07.30	SixDays Budapest July GM B	2.4	2024.07.30 Chubakov, Sultan (13803468) (2330)	½	95.00%	1. d4 Nf6 2. c4 e6 3. g3 c5
2024.07.29	SixDays Budapest July GM B	1.3	2024.07.29 Setyaki, Azarya Jodi (7101589) (2370)	1	98.20%	1. Nf3 d5 2. e3 Nf6 3. c4 e6
2024.07.25	Biel Chess Festival MTO	10.14	2024.07.25 Nurman, Alua (13729390) (2266)	½	96.30%	1. Nf3 Nf6 2. g3 g6 3. b3 Bg7
2024.07.24	Biel Chess Festival MTO	9.12	2024.07.24 Rosen, Eric (2032562) (2374)	½	85.50%	1. e4 e5 2. Nf3 Nc6 3. d4 exd4
2024.07.23	Biel Chess Festival MTO	8.6	2024.07.23 Madaminov, Mukhiddin (14210703) (2512)	0	86.70%	1. c4 e6 2. Nc3 d5 3. d4 Nf6
2024.07.22	Biel Chess Festival MTO	7.7	2024.07.22 Xue, Haowen (8625492) (2452)	½	97.30%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2024.07.20	Biel Chess Festival MTO	6.5	2024.07.20 Sethuraman, S.P. (5021596) (2589)	½	93.80%	1. d4 Nf6 2. c4 d6 3. Nf3 g6
2024.07.19	Biel Chess Festival MTO	5.4	2024.07.19 Moiseenko, Alexander (14102560) (2570)	½	97.80%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2024.07.18	Biel Chess Festival MTO	4.2	2024.07.18 Jumabayev, Rinat (13702661) (2565)	½	95.50%	1. Nf3 d5 2. g3 c5 3. Bg2 Nf6
2024.07.17	Biel Chess Festival MTO	3.7	2024.07.17 Sukandar, Irine Kharisma (7101937) (2338)	1	96.00%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2024.07.16	Biel Chess Festival MTO	2.12	2024.07.16 Haimovich, Tal (2801698) (2324)	1	94.20%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2024.07.15	Biel Chess Festival MTO	1.12	2024.07.15 Rappazzo, Johannes (1340069) (2169)	1	96.80%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
2024.07.08	Festival Echecs Plagne 2024	4.2	2024.07.08 Wirig, Anthony (615013) (2435)	½	99.50%	1. d4 Nf6 2. Nf3 d5 3. e3 c5
2024.07.08	Festival Echecs Plagne 2024	3.4	2024.07.08 Sabuk, Piotr (1137565) (2412)	1	98.80%	1. d4 d5 2. c4 e6 3. Nc3 Nf6
2024.07.06	Festival Echecs Plagne 2024	1.7	2024.07.06 Warnier, Yanis (36084565) (2168)	1	99.50%	1. Nf3 d5
2024.03.31	Round 3: Beradze, Irakli - Koustav Chatterjee		2024.03.31 Beradze, Irakli (13604597) (2507)	½	95.40%	1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6
2024.03.30	Round 2: Antipov, Mikhail Al. - Koustav Chatterjee		2024.03.30 Antipov, Mikhail Al. (4107012) (2573)	0	91.60%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2024.03.30	Round 1: Koustav Chatterjee - Gledura, Benjamin		2024.03.30 Gledura, Benjamin (712779) (2616)	0	86.20%	1. d4 d5 2. c4 c6 3. Nf3 Nf6
2024.01.15	Round 9: Joseph Levine - Koustav Chatterjee		2024.01.15 Joseph Levine	1	95.30%	1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
2024.01.15	Round 8: Koustav Chatterjee - Terry Luo		2024.01.15 Terry Luo	1	96.40%	1. Nf3 Nf6 2. d4 g6 3. c4 Bg7
2024.01.14	Round 7: Kyron Griffith - Koustav Chatterjee		2024.01.14 Kyron Griffith	½	96.10%	1. e4 e6 2. d4 d5 3. Nd2 c5
2024.01.14	Round 6: Koustav Chatterjee - Akira Nakada		2024.01.14 Akira Nakada	1	97.30%	1. e4 c6 2. d4 d5 3. e5 c5
2024.01.13	Round 5: Koustav Chatterjee - Tanitaluwa Adewumi		2024.01.13 Tanitaluwa Adewumi	½	93.90%	1. e4 c5 2. Nf3 e6 3. b3 Nc6
2024.01.13	Round 4: Alice Lee - Koustav Chatterjee		2024.01.13 Alice Lee	1	98.10%	1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7
2024.01.12	Round 3: Koustav Chatterjee - Mark Paragua		2024.01.12 Mark Paragua	½	94.80%	1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7
2024.01.12	Round 2: Gabor Nagy - Koustav Chatterjee		2024.01.12 Gabor Nagy	½	98.70%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2024.01.11	Round 1: Koustav Chatterjee - William Graif		2024.01.11 William Graif	1	98.50%	1. e4 c5 2. Nf3 Nc6 3. Bb5 g6
2023.12.30	Round 9: Koustav Chatterjee - Arman Mikaelyan		2023.12.30 Arman Mikaelyan	1	98.50%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2023.12.30	Round 8: Steven C Zierk - Koustav Chatterjee		2023.12.30 Steven C Zierk	1	96.00%	1. Nf3 d5 2. g3 Nd7 3. Bg2 e5
2023.12.29	Round 7: Koustav Chatterjee - Jacob Furfine		2023.12.29 Jacob Furfine	1	97.30%	1. Nf3 Nf6 2. c4 e6 3. Nc3 d5
2023.12.29	33rd Annual North American Open	6.10	2023.12.29 Andrei Macovei (2460)	*	98.60%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2023.12.28	33rd Annual North American Open	5.15	2023.12.28 Zoey Tang (2284)	1	93.80%	1. Nf3 d5 2. e3 c5 3. b3 Nc6
2023.12.28	Round 4: Richard Balansag Bitoon - Koustav Chatterjee		2023.12.28 Richard Balansag Bitoon	0	88.40%	1. c4 Nf6 2. Nc3 e5 3. g3 Bb4
2023.04.16	Menorca Open	9	2023.04.16 Niemann, Hans Moke (2093596) (2706)	½	97.60%	1. d4 Nf6 2. c4 e6 3. g3 c5
2023.04.15	Menorca Open	8	2023.04.15 Fier, Alexandr (2107139) (2599)	1	95.00%	1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
2023.04.15	Menorca Open	7	2023.04.15 Xu, Yi (8605564) (2505)	1	95.10%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2023.04.13	Menorca Open	4	2023.04.13 Gukesh D (46616543) (2730)	0	88.20%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2023.04.09	Fagernes Chess International 2023	9.3	2023.04.09 Ter-Sahakyan, Samvel (13302531) (2613)	0	90.80%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2023.04.08	Fagernes Chess International 2023	8.4	2023.04.08 Raja Rithvik R (35007394) (2472)	1	94.20%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2023.04.07	Fagernes Chess International 2023	7.4	2023.04.07 Rozentalis, Eduardas (12800023) (2504)	½	96.60%	1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+
2023.04.06	Fagernes Chess International 2023	6.1	2023.04.06 Puranik, Abhimanyu (5061245) (2599)	½	97.80%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2023.04.05	Fagernes Chess International 2023	5.4	2023.04.05 Savitha Shri B (35061887) (2411)	1	95.60%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2023.04.05	Fagernes Chess International 2023	5.4	2023.04.05 Savitha Shri B (35061887) (2411)	*	80.70%	1. Nf3 d5 2. d4 Nf6 3. c4 e6
2023.04.04	Fagernes Chess International 2023	3.4	2023.04.04 Dotzer, Lukas (1666975) (2416)	0	91.20%	1. e4 e6 2. d4 d5 3. Nc3 Bb4
2023.04.03	Fagernes Chess International 2023	2.6	2023.04.03 Vestby-Ellingsen, Mads (1520857) (2387)	1	98.50%	1. d4 Nf6 2. c4 e6 3. Nf3 d5
2023.04.02	Fagernes Chess International 2023	1.8	2023.04.02 Sourath Biswas (35091484) (2265)	1	96.30%	1. Nf3 Nf6 2. c4 e6 3. b3 d5
2023.01.03	MPL 59th Indian Championship	13	2023.01.03 Hari Madhavan N B (25054309) (2385)	½	90.70%	1. d4 Nf6 2. c4 e6 3. Nc3 d5
2023.01.02	MPL 59th Indian Championship	12	2023.01.02 Karthik Venkataraman (25006479) (2503)	0	83.20%	1. d4 Nf6 2. Nf3 d5 3. c4 e6
2023.09.17	Round 4: Irakli Beradze - Chatterjee Koustav		2023.09.17 Irakli Beradze	½	96.90%	1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
2023.09.17	Round 3: Chatterjee Koustav - Aleksey Sorokin		2023.09.17 Aleksey Sorokin	½	96.70%	1. Nf3 Nf6 2. c4 c5 3. Nc3 e6
2023.09.16	Round 2: Viktor Gazik - Chatterjee Koustav		2023.09.16 Viktor Gazik	1	95.80%	1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
2023.09.16	Round 1: Chatterjee Koustav - Nathaniel Philip Moor		2023.09.16 Nathaniel Philip Moor	1	96.60%	1. Nf3 d5 2. g3 Nc6 3. d4 Bf5
2023.01.01	MPL 59th Senior National	11.2	2023.01.01 Srihari, L R (2429)	½	83.20%	1. d4 Nf6 2. c4 e6 3. g3 d5