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Player Profile

Player:

(Eg: Carlsen,Magnus)

Koster, R



Years:	2025-
Number of games:	27
Number of wins:	13
Number of draws:	6
Number of losses:	8
White score:	9/14 (64.29% - Average Elo: 2237.21)
Black score:	7/13 (53.85% - Average Elo: 2238.23)

Games
White wins
White draws
White losses
Black wins
Black draws
Black losses

Top wins

Koster, R (2307) - Wempe, Joost (2212), 61st Groningen Open 2025, Groningen NED (E49) - 2025

Koster, R (2307) - Edwardss, Dylan (2165), 61st Groningen Open 2025, Groningen NED (E43) - 2025

Koster, R (2296) - Bourg, Nicolas (2160), Djerba Open A 2026, Djerba TUN (A81) - 2026

Cai, Chaoruo (2274) - Koster, R (2296), Djerba Open A 2026, Djerba TUN (D11) - 2026

Badrinath, S (2200) - Koster, R (2302), 15th London Classic Open, London ENG (B12) - 2025

Sanjay Narayanan P S (2142) - Koster, R (2307), 61st Groningen Open 2025, Groningen NED (B90) - 2025

Koster, R - ? (14)

Achour, Mohamed Anis (½/1)

Bourg, Nicolas (1/1)

De Boer, Eelke (½/1)

Deepak Ambattu, Rithvik (½/1)

Duijker, Rick (½/1)

Edwardss, Dylan (1/1)

Farberov, Maxim (1/1)

Liu, Huaqi (1/1)

Magold, Filip (0/1)

Mesropyan, Hayk (1/1)

Minde, Baptiste (1/1)

Shyam, Nikil P (0/1)

Wempe, Joost (1/1)

Yuffa, Daniil (0/1)

? - Koster, R (13)

Badrinath, S (1/1)

Berend, Elvira S (½/1)

Bouzidi, Ahmed (1/1)

Cai, Chaoruo (1/1)

Carroll, Peter (0/1)

Elmi, Saad Abobaker (0/1)

Han, Qixiang (0/1)

Khandhadia, Nivaan Rathin (1/1)

Kudaibergen, Nurlykhan (1/1)

Moussard, Jules (0/1)

Sanjay Narayanan P S (1/1)

Schuricht, Emil Frederick (½/1)

Zaibi, Amir (0/1)

Openings played as White (11)

A57 Benko Gambit (1.d4 Nf6 2.c4 c5 3.d5 b5)
Average Elo: 2317.67
Result: 1½/3 = 50%

E49 Nimzo-Indian, 4.e3, Botvinnik System (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.a3 Bxc3+ 7.bxc3)
Average Elo: 2170.5
Result: 1½/2 = 75%

A81 Dutch (1.d4 f5 2.g3)
Average Elo: 2160
Result: 1/1 = 100%

D35 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6)
Average Elo: 2168
Result: ½/1 = 50%

D21 Queen's Gambit Accepted (1.d4 d5 2.c4 dxc4 3.Nf3)
Average Elo: 2148
Result: ½/1 = 50%

E43 Nimzo-Indian, Fischer Variation (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6)
Average Elo: 2165
Result: 1/1 = 100%

E94 King's Indian, Orthodox (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O)
Average Elo: 2133
Result: 1/1 = 100%

A42 Modern Defense, Averbakh System (1.d4 d6 2.c4 g6 3.Nc3 Bg7 4.e4)
Average Elo: 2099
Result: 1/1 = 100%

D37 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3)
Average Elo: 2136
Result: 1/1 = 100%

E40 Nimzo-Indian, 4.e3 (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3)
Average Elo: 2400
Result: 0/1 = 0%

E46 Nimzo-Indian (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O)
Average Elo: 2618
Result: 0/1 = 0%

Openings played as Black (9)

B90 Sicilian, Najdorf (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6)
Average Elo: 2153.5
Result: 1/2 = 50%

B12 Caro-Kann Defense (1.e4 c6 2.d4)
Average Elo: 2396
Result: 1/2 = 50%

D19 Queen's Gambit Declined Slav, Dutch (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O 9.Qe2)
Average Elo: 2178
Result: ½/2 = 25%

D10 Queen's Gambit Declined Slav (1.d4 d5 2.c4 c6)
Average Elo: 2187
Result: 1½/2 = 75%

B13 Caro-Kann, Exchange (1.e4 c6 2.d4 d5 3.exd5 cxd5)
Average Elo: 2127
Result: 1/1 = 100%

B50 Sicilian (1.e4 c5 2.Nf3 d6)
Average Elo: 2409
Result: 0/1 = 0%

B22 Sicilian, Alapin (1.e4 c5 2.c3)
Average Elo: 2126
Result: 1/1 = 100%

A46 Queen's Pawn Game (1.d4 Nf6 2.Nf3)
Average Elo: 2332
Result: 0/1 = 0%

D11 Queen's Gambit Declined Slav (1.d4 d5 2.c4 c6 3.Nf3)
Average Elo: 2274
Result: 1/1 = 100%