Player profile
Klaasen, Calvin John
Dossier
43 of 49 games analyzed.
Accuracy: 92.8%
Opened d4: 11/20Opened e4: 8/20Opened c4: 1/20
Castled kingside: 31Same-side castling: 31Did not castle: 6Castled queenside: 1
Played in the center: 14Fianchettoed queenside: 11Fianchettoed kingside: 10Played on the queenside: 10Played on the kingside: 4
Space advantage: 26Active pieces: 25Initiated exchanges: 22Backward pawn: 22Kept the bishop pair: 21Sacrificed material: 20Isolated pawn: 15Avoided exchanges: 10Missed tactics: 7Accepted short draws: 5
Openings
Click "+" to add that group to the games list below. Multiple groups can be added at once.
As White 23 games 8W 12D 3L
Sicilian Defense 7 games 2W 3D 2L
Closed 1 game 1W 0D 0L
Traditional
1 game
1W
0D
0L
Four Knights Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Delayed Alapin Variation 1 game 0W 0D 1L
with e6
1 game
0W
0D
1L
Kan Variation 1 game 0W 1D 0L
Maróczy Bind, Réti Variation
1 game
0W
1D
0L
Accelerated Dragon 1 game 0W 1D 0L
Maróczy Bind
1 game
0W
1D
0L
Sozin Attack 1 game 0W 0D 1L
Leonhardt Variation
1 game
0W
0D
1L
Najdorf Variation 1 game 1W 0D 0L
Opocensky Variation, Traditional Line
1 game
1W
0D
0L
Queen's Gambit Declined 3 games 1W 2D 0L
Exchange Variation 2 games 1W 1D 0L
Positional Variation
2 games
1W
1D
0L
Three Knights Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Nimzo-Indian Defense 3 games 2W 0D 1L
Classical Variation 3 games 2W 0D 1L
(unspecified)
2 games
2W
0D
0L
Noa Variation
1 game
0W
0D
1L
Slav Defense 2 games 0W 2D 0L
Modern Line 2 games 0W 2D 0L
(unspecified)
2 games
0W
2D
0L
Queen's Pawn Game 1 game 1W 0D 0L
Symmetrical Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Grünfeld Defense 1 game 1W 0D 0L
Three Knights Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Benko Gambit Accepted 1 game 0W 1D 0L
Fully Accepted Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
English Opening 1 game 1W 0D 0L
King's English Variation 1 game 1W 0D 0L
Reversed Closed Sicilian
1 game
1W
0D
0L
Petrov's Defense 1 game 0W 1D 0L
Modern Attack 1 game 0W 1D 0L
Center Variation
1 game
0W
1D
0L
Scotch Game 1 game 0W 1D 0L
Classical Variation 1 game 0W 1D 0L
Intermezzo Variation
1 game
0W
1D
0L
King's Indian Defense 1 game 0W 1D 0L
Semi-Averbakh System 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Bogo-Indian Defense 1 game 0W 1D 0L
Nimzowitsch Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
As Black 21 games 6W 9D 4L
Sicilian Defense 8 games 1W 4D 2L
Accelerated Dragon 3 games 0W 2D 1L
Maróczy Bind
2 games
0W
2D
0L
Modern Bc4 Variation
1 game
0W
0D
1L
Nyezhmetdinov-Rossolimo Attack 2 games 0W 0D 1L
(unspecified)
2 games
0W
0D
1L
Kalashnikov Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Lasker-Pelikan Variation 1 game 0W 1D 0L
Sveshnikov Variation
1 game
0W
1D
0L
French Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Queen's Gambit Declined 5 games 2W 3D 0L
(unspecified) 2 games 1W 1D 0L
(unspecified)
2 games
1W
1D
0L
Harrwitz Attack 1 game 0W 1D 0L
Fianchetto Defense
1 game
0W
1D
0L
Tartakower Defense 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Janowski Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Ruy Lopez 2 games 0W 0D 2L
Morphy Defense 1 game 0W 0D 1L
Tarrasch Variation
1 game
0W
0D
1L
Closed 1 game 0W 0D 1L
Flohr System
1 game
0W
0D
1L
Caro-Kann Defense 2 games 0W 1D 0L
Advance Variation 1 game 0W 1D 0L
Van der Wiel Attack
1 game
0W
1D
0L
Panov Attack 1 game 0W 0D 0L
Modern Defense, Mieses Line
1 game
0W
0D
0L
Bogo-Indian Defense 1 game 1W 0D 0L
Grünfeld Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Bishop's Opening 1 game 1W 0D 0L
Vienna Hybrid 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
English Opening 1 game 1W 0D 0L
Symmetrical Variation 1 game 1W 0D 0L
Three Knights, Fianchetto Variation
1 game
1W
0D
0L
Rapport-Jobava System 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Blunders Top 4 of 110
This player's costliest moves in analyzed games. Can you find the winning move?
Games Showing all 49 games
| Date | Event | Round | Color | Opponent | Result | Accuracy % | First moves |
|---|---|---|---|---|---|---|---|
| 2026.07.05 | SA Open 2026 Championship | 9.4 | 2026.07.05 Dinham, James (14327023) (2140) | 1 | 94.10% | 1. e4 c5 2. Nc3 Nc6 3. Nf3 a6 | |
| 2026.07.04 | SA Open 2026 Championship | 8.4 | 2026.07.04 Ressel, Tane (14342898) (1840) | 1 | 91.10% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | |
| 2026.07.03 | SA Open 2026 Championship | 7.3 | 2026.07.03 Li, Zhengfei (14361604) (1919) | ½ | 95.00% | 1. d4 d5 2. c4 c6 3. Nf3 Nf6 | |
| 2026.07.02 | SA Open 2026 Championship | 6.2 | 2026.07.02 Mnyasta, Charlton (14343371) (2215) | 0 | - | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2026.07.01 | SA Open 2026 Championship | 5.2 | 2026.07.01 Schutte, Andre (14306000) (1865) | 1 | - | 1. Nf3 Nf6 2. d4 d5 3. c4 c6 | |
| 2026.06.29 | SA Open 2026 Championship | 4.3 | 2026.06.29 Mnyasta, Tezihano (14339447) (1997) | ½ | 98.10% | 1. d4 d5 2. c4 e6 3. Nf3 c6 | |
| 2026.06.29 | SA Open 2026 Championship | 3.1 | 2026.06.29 Rogov, Matfey (44191308) (2369) | ½ | - | 1. d4 e6 2. Nf3 c5 3. e4 cxd4 | |
| 2026.06.29 | SA Open 2026 Championship | 2.3 | 2026.06.29 Davies, Shaughn (14305364) (1904) | 1 | - | 1. Nf3 Nf6 2. d4 g6 3. c4 Bg7 | |
| 2026.06.29 | SA Open 2026 Championship | 1.3 | 2026.06.29 Ncethelo, Bongolethu (14353091) (1869) | 1 | - | 1. d4 d5 2. c4 e6 3. Nf3 c6 | |
| 2026.03.01 | SA Adult Closed | 11.5 | 2026.03.01 Mnyasta, Charlton (14343371) (2158) | ½ | 97.60% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | |
| 2026.02.25 | SA Adult Closed | 7.3 | 2026.02.25 Dinham, James (14327023) (2091) | 0 | 93.20% | 1. Nf3 c5 2. e4 Nc6 3. Nc3 g6 | |
| 2026.02.23 | SA Adult Closed | 5.2 | 2026.02.23 Cawdery, Daniel (14300249) (2337) | ½ | 98.10% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | |
| 2026.02.22 | SA Adult Closed | 4.6 | 2026.02.22 Karsten, Jan (14350653) (2385) | ½ | 98.40% | 1. d4 Nf6 2. c4 c5 3. d5 b5 | |
| 2026.02.22 | SA Adult Closed | 3.1 | 2026.02.22 Simpson, Michael (14338882) (2166) | ½ | 96.30% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | |
| 2026.02.21 | SA Adult Closed | 2.6 | 2026.02.21 Levitan, Judah Nathan (14332639) (2205) | * | - | 1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 | |
| 2026.02.21 | SA Adult Closed | 1.2 | 2026.02.21 Van Zyl-Rudd, Jack (14309017) (2230) | 0 | 67.30% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2026.02.19 | SA Adult Closed | 10.3 | 2026.02.19 Levitan, Caleb Levi (14332620) (2192) | 0 | 86.90% | 1. e4 c5 2. Nf3 e6 3. c3 Nf6 | |
| 2026.02.19 | SA Adult Closed | 9.4 | 2026.02.19 Mhango, Banele (14327040) (2225) | ½ | 92.60% | 1. c4 c5 2. Nf3 g6 3. d4 cxd4 | |
| 2026.02.19 | SA Adult Closed | 8.4 | 2026.02.19 Barrish, Daniel (14304600) (2290) | 1 | 90.20% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2026.02.19 | SA Adult Closed | 6.5 | 2026.02.19 Mazibuko, Khanya (14321041) (2069) | 1 | 99.20% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2026.02.19 | SA Adult Closed | 2.6 | 2026.02.19 Levitan, Judah Nathan (14332639) (2205) | 0 | 87.70% | 1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 | |
| 2025.01.08 | Round 5: Klaasen, Calvin John - Kobese, Watu | 5.2 | 2025.01.08 Kobese, Watu (14300141) (2264) | ½ | 94.60% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2025.01.08 | Round 4: Samuels, Ethan - Klaasen, Calvin John | 4.4 | 2025.01.08 Samuels, Ethan (14321068) (2025) | 1 | 90.90% | 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nc6 | |
| 2025.01.07 | Round 3: Klaasen, Calvin John - Schutte, Andre | 3.4 | 2025.01.07 Schutte, Andre (14306000) (1877) | ½ | 90.30% | 1. d4 d5 2. c4 c6 3. Nf3 e6 | |
| 2025.01.06 | Round 2: Klaasen, Calvin John - Milford, Eugene | 2.6 | 2025.01.06 Milford, Eugene (14310260) (1812) | 1 | 80.90% | 1. c4 e5 2. Nc3 Nc6 | |
| 2025.01.06 | Round 1: Mncwabe, Minenhle Junior - Klaasen, Calvin John | 1.7 | 2025.01.06 Mncwabe, Minenhle Junior (14324350) (1860) | 1 | 95.90% | 1. Nf3 c5 2. c4 g6 3. g3 Bg7 | |
| 2024.04.02 | Round 11: Karsten, Jan - Klaasen, Calvin John | 2024.04.02 Karsten, Jan (14350653) (2307) | 0 | 92.90% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | ||
| 2024.04.01 | Round 10: Klaasen, Calvin John - Mnguni, Jacob Dumisani | 2024.04.01 Mnguni, Jacob Dumisani (14320908) (2134) | ½ | 94.10% | 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 | ||
| 2024.03.31 | Round 9: Barrish, Daniel - Klaasen, Calvin John | 2024.03.31 Barrish, Daniel (14304600) (2218) | ½ | 98.80% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | ||
| 2024.03.31 | Round 8: Klaasen, Calvin John - Levitan, Caleb Levi | 2024.03.31 Levitan, Caleb Levi (14332620) (2235) | ½ | 94.90% | 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 | ||
| 2024.03.30 | Round 7: Kobese, Watu - Klaasen, Calvin John | 2024.03.30 Kobese, Watu (14300141) (2268) | ½ | 86.90% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | ||
| 2024.03.29 | Round 6: Klaasen, Calvin John - Cawdery, Daniel | 2024.03.29 Cawdery, Daniel (14300249) (2380) | ½ | 99.20% | 1. e4 c5 2. Nf3 g6 3. d4 cxd4 | ||
| 2024.03.29 | Round 5: Mfazwe, Lutho - Klaasen, Calvin John | 2024.03.29 Mfazwe, Lutho (14310244) (1956) | 1 | 96.20% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | ||
| 2024.03.28 | Round 4: Klaasen, Calvin John - Mhango, Banele | 2024.03.28 Mhango, Banele (14327040) (2193) | ½ | 94.20% | 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 | ||
| 2024.03.27 | Round 3: Khumalo, Keith - Klaasen, Calvin John | 2024.03.27 Khumalo, Keith (14319470) (2079) | ½ | 94.50% | 1. d4 d5 2. Nc3 Nf6 3. Bf4 a6 | ||
| 2024.03.26 | Round 2: Klaasen, Calvin John - Mnyasta, Charlton | 2024.03.26 Mnyasta, Charlton (14343371) (2123) | 0 | 86.90% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | ||
| 2024.03.25 | Round 1: Klaasen, Calvin John - Simpson, Michael | 2024.03.25 Simpson, Michael (14338882) (2093) | 1 | 89.40% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | ||
| 2024.01.07 | Round 9: Watu Kobese - Calvin John Klaasen | 2024.01.07 Watu Kobese | ½ | 95.70% | 1. e4 c6 2. d4 d5 3. e5 Bf5 | ||
| 2024.01.06 | Round 8: Calvin John Klaasen - Charlton Mnyasta | 2024.01.06 Charlton Mnyasta | 1 | 97.40% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | ||
| 2024.01.06 | Round 7: Matfey Rogov - Calvin John Klaasen | 2024.01.06 Matfey Rogov | ½ | 96.10% | 1. d4 d5 2. c4 e6 3. Nc3 a6 | ||
| 2024.01.05 | Round 6: Calvin John Klaasen - Edward Potgieter | 2024.01.05 Edward Potgieter | ½ | 91.50% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | ||
| 2024.01.05 | Round 5: Reegan Palmer - Calvin John Klaasen | 2024.01.05 Reegan Palmer | 1 | 91.40% | 1. e4 c5 2. Nf3 e6 3. g3 Nc6 | ||
| 2024.01.04 | Round 4: Calvin John Klaasen - Tezihano Mnyasta | 2024.01.04 Tezihano Mnyasta | ½ | 92.40% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | ||
| 2024.01.03 | Round 1: Minenhle Junior Mncwabe - Calvin John Klaasen | 2024.01.03 Minenhle Junior Mncwabe | * | 95.20% | 1. e4 d5 2. exd5 Nf6 3. c4 c6 | ||
| 2023.06.11 | Round 5: Jan Karsten - Calvin John Klaasen | 2023.06.11 Jan Karsten | ½ | 91.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | ||
| 2023.06.11 | Round 4: Calvin John Klaasen - Matfey Rogov | 2023.06.11 Matfey Rogov | 1 | 85.70% | 1. d4 e6 2. e4 d5 3. Nc3 Bb4 | ||
| 2023.06.10 | Round 3: Jan Boder - Calvin John Klaasen | 2023.06.10 Jan Boder | ½ | 90.50% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | ||
| 2023.06.10 | Round 2: Calvin John Klaasen - Daniel Barrish | 2023.06.10 Daniel Barrish | * | 83.90% | 1. d4 Nf6 2. Nf3 d5 3. c4 e6 | ||
| 2023.06.09 | Round 1: Yovann Gatineau - Calvin John Klaasen | 2023.06.09 Yovann Gatineau | 0 | 88.40% | 1. d4 d5 2. Nf3 Nf6 3. g3 c6 |