Player profile
Krefenstein, Sergej
Dossier
34 of 35 games analyzed.
Accuracy: 90.5%
Opened d4: 13/18Opened e4: 5/18
Castled kingside: 26Same-side castling: 25Castled queenside: 5Opposite-side castling: 3Did not castle: 1
Played on the queenside: 12Played in the center: 10Fianchettoed queenside: 7Played on the kingside: 7Fianchettoed kingside: 4
Active pieces: 28Backward pawn: 21Space advantage: 19Kept the bishop pair: 18Sacrificed material: 17Initiated exchanges: 14Missed tactics: 14Isolated pawn: 9Avoided exchanges: 8Played gambits: 3
Openings
Click "+" to add that group to the games list below. Multiple groups can be added at once.
As White 19 games 3W 10D 6L
Queen's Gambit Declined 4 games 0W 4D 0L
Traditional Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Queen's Knight Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Semi-Slav 1 game 0W 1D 0L
Abrahams Variation
1 game
0W
1D
0L
Harrwitz Attack 1 game 0W 1D 0L
Main Line
1 game
0W
1D
0L
King's Indian Defense 4 games 0W 1D 3L
Orthodox Variation 3 games 0W 1D 2L
Classical System
1 game
0W
0D
1L
Classical System, Benko Attack
1 game
0W
0D
1L
Gligoric-Taimanov System
1 game
0W
1D
0L
Semi-Averbakh System 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Sicilian Defense 3 games 1W 1D 1L
Dragon Variation 2 games 1W 1D 0L
Yugoslav Attack, Early Deviations
1 game
0W
1D
0L
Yugoslav Attack, Chinese Dragon
1 game
1W
0D
0L
Nyezhmetdinov-Rossolimo Attack 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Nimzo-Indian Defense 2 games 0W 1D 1L
Sämisch Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Kmoch Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Slav Defense 1 game 0W 1D 0L
Czech Variation 1 game 0W 1D 0L
Krause Attack
1 game
0W
1D
0L
Benko Gambit Declined 1 game 1W 0D 0L
Main Line 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Horwitz Defense 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Ruy Lopez 1 game 1W 0D 0L
Morphy Defense 1 game 1W 0D 0L
Steinitz Deferred
1 game
1W
0D
0L
French Defense 1 game 0W 0D 1L
Advance Variation 1 game 0W 0D 1L
Main Line
1 game
0W
0D
1L
Queen's Indian Defense 1 game 0W 1D 0L
Kasparov-Petrosian Variation 1 game 0W 1D 0L
Classical Variation
1 game
0W
1D
0L
As Black 14 games 6W 4D 4L
Sicilian Defense 4 games 4W 0D 0L
Najdorf Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Boleslavsky Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Sozin Attack 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Scheveningen Variation 1 game 1W 0D 0L
Classical Variation
1 game
1W
0D
0L
French Defense 3 games 0W 3D 0L
Advance Variation 2 games 0W 2D 0L
Main Line
2 games
0W
2D
0L
King's Indian Attack 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Indian Defense 1 game 0W 0D 1L
London System 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Caro-Kann Defense 1 game 1W 0D 0L
Endgame Offer 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Queen's Gambit Declined 1 game 0W 0D 1L
Ragozin Defense 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Zukertort Opening 1 game 1W 0D 0L
Dutch Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Scotch Game 1 game 0W 1D 0L
Scotch Gambit 1 game 0W 1D 0L
Göring Gambit Declined
1 game
0W
1D
0L
Nimzo-Indian Defense 1 game 0W 0D 1L
Classical Variation 1 game 0W 0D 1L
Noa Variation
1 game
0W
0D
1L
King's Indian Attack 1 game 0W 0D 1L
Keres Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Blunders Top 4 of 147
This player's costliest moves in analyzed games. Can you find the winning move?
Games Showing all 35 games
| Date | Event | Round | Color | Opponent | Result | Accuracy % | First moves |
|---|---|---|---|---|---|---|---|
| 2026.08.09 | Round 9: Wirth, Heinz, Dr. - Krefenstein, Sergej | 9.6 | 2026.08.09 Wirth, Heinz, Dr. (12958328) (1984) | 1 | 90.40% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2026.08.08 | Round 8: Krefenstein, Sergej - Strehse, Nelson | 8.4 | 2026.08.08 Strehse, Nelson (16228898) (2321) | ½ | 98.30% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | |
| 2026.08.07 | Round 7: Krefenstein, Sergej - Dimitrijeski, Kristian | 7.3 | 2026.08.07 Dimitrijeski, Kristian (4627229) (2066) | ½ | 97.10% | 1. d4 d5 2. c4 c6 3. Nf3 Nf6 | |
| 2026.08.06 | Round 6: Ruediger Merz - Krefenstein, Sergej | 6.7 | 2026.08.06 Ruediger Merz | 1 | 91.20% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | |
| 2026.08.04 | Round 4: Beduschi, Ben - Krefenstein, Sergej | 4.5 | 2026.08.04 Beduschi, Ben (16273443) (2017) | 0 | 85.10% | 1. d4 Nf6 2. Nf3 e6 3. Bf4 b6 | |
| 2026.08.02 | Round 2: Ozates, Mert - Krefenstein, Sergej | 2.8 | 2026.08.02 Ozates, Mert (6328075) (1926) | 1 | 97.80% | 1. e4 c6 2. Nf3 d5 3. d3 Bg4 | |
| 2026.07.30 | Round 3: Krefenstein, Sergej - Eilenberg, Jonas | 3.1 | 2026.07.30 Eilenberg, Jonas (16204271) (2388) | ½ | 91.40% | 1. d4 d5 2. c4 e6 3. Nc3 Bb4 | |
| 2026.04.12 | Round 9: Krefenstein, Sergej - Piz, Maxim, Dr. | 9.12 | 2026.04.12 Piz, Maxim, Dr. (24602981) (2108) | 0 | 71.40% | 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 | |
| 2026.04.11 | Round 8: Krefenstein, Sergej - Thuemler, Floris | 8.14 | 2026.04.11 Thuemler, Floris (16296435) (2029) | ½ | 86.00% | 1. d4 d5 2. c4 e6 3. Nc3 c6 | |
| 2026.04.10 | Round 7: Dimitrijeski, Kristian - Krefenstein, Sergej | 7.12 | 2026.04.10 Dimitrijeski, Kristian (4627229) (2056) | 0 | 89.70% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | |
| 2026.04.09 | Round 6: Krefenstein, Sergej - Noll, Paul | 6.10 | 2026.04.09 Noll, Paul (16290631) (2142) | ½ | 94.30% | 1. d4 d5 2. c4 e6 3. Nc3 Be7 | |
| 2026.04.08 | Round 5: Gelman, Josef - Krefenstein, Sergej | 5.14 | 2026.04.08 Gelman, Josef (12959642) (2066) | 1 | 89.80% | 1. Nf3 f5 2. g3 Nf6 3. Bg2 g6 | |
| 2026.04.07 | Round 4: Krefenstein, Sergej - Niehaus, Frank | 4.12 | 2026.04.07 Niehaus, Frank (24600490) (2101) | 0 | 82.20% | 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 | |
| 2026.04.06 | Round 3: Brustkern, Juergen - Krefenstein, Sergej | 3.10 | 2026.04.06 Brustkern, Juergen (4602676) (2110) | ½ | 97.90% | 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 | |
| 2026.04.05 | Round 2: Schliebener, Stephan - Krefenstein, Sergej | 2.10 | 2026.04.05 Schliebener, Stephan (4621662) (2123) | 0 | 87.50% | 1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 | |
| 2026.04.04 | Round 1: Krefenstein, Sergej - Foerster, Jonas | 1.9 | 2026.04.04 Foerster, Jonas (4640098) (2250) | ½ | 93.60% | 1. d4 g6 2. c4 Bg7 3. Nc3 d6 | |
| 2025.12.29 | Round 6: Krefenstein, Sergej - Foerster, Jonas | 6.5 | 2025.12.29 Foerster, Jonas (4640098) (2218) | 0 | 89.60% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2025.12.28 | Round 4: Krefenstein, Sergej - Wichmann, Cliff | 4.5 | 2025.12.28 Wichmann, Cliff (4616090) (2264) | ½ | 93.80% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2025.11.02 | Round 6: Simcaks, Sergejs - Krefenstein, Sergej | 6.3 | 2025.11.02 Simcaks, Sergejs (11603755) (1943) | 1 | 93.40% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2025.11.01 | Round 5: Krefenstein, Sergej - Litvinov, Ivan | 5.4 | 2025.11.01 Litvinov, Ivan (14149729) (1815) | 1 | 98.40% | 1. d4 Nf6 2. c4 c5 3. d5 b5 | |
| 2025.10.31 | Round 7: Krefenstein, Sergej - Strache, Michael | 7.1 | 2025.10.31 Strache, Michael (4693183) (2244) | ½ | - | 1. d4 e6 | |
| 2025.10.31 | Round 2: Krefenstein, Sergej - Guder, Sibylle | 2.4 | 2025.10.31 Guder, Sibylle (16245555) (1863) | 0 | 90.10% | 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 | |
| 2025.10.31 | Round 1: Kohlmeyer, Dagobert - Krefenstein, Sergej | 1.4 | 2025.10.31 Kohlmeyer, Dagobert (24670332) | 1 | 93.10% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2025.04.27 | Round 9: Krefenstein, Sergej - Jahnz, Fabian | 9.8 | 2025.04.27 Jahnz, Fabian (4653300) (2242) | 0 | 84.30% | 1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 | |
| 2025.04.26 | Round 8: Heerde, Thomas - Krefenstein, Sergej | 8.9 | 2025.04.26 Heerde, Thomas (12945684) (1983) | ½ | 83.90% | 1. e4 e6 2. d3 d5 3. Nd2 c5 | |
| 2025.04.25 | Round 7: Klenburg, Michael - Krefenstein, Sergej | 7.6 | 2025.04.25 Klenburg, Michael (14102072) (2338) | 0 | 85.90% | 1. g3 d5 2. Nf3 Bg4 3. Bg2 Nf6 | |
| 2025.04.24 | Round 6: Krefenstein, Sergej - Nogly, Christoph | 6.9 | 2025.04.24 Nogly, Christoph (4610156) (2203) | 1 | 87.90% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2025.04.23 | Round 5: Krefenstein, Sergej - Niehaus, Frank | 5.11 | 2025.04.23 Niehaus, Frank (24600490) (2126) | ½ | 89.00% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2025.04.22 | Round 4: Noeldner, Julian - Krefenstein, Sergej | 4.11 | 2025.04.22 Noeldner, Julian (16218744) (2279) | ½ | 96.50% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2025.04.21 | Round 3: Kreutz, Jonas - Krefenstein, Sergej | 3.14 | 2025.04.21 Kreutz, Jonas (12970697) (2109) | ½ | 85.90% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2025.04.20 | Round 2: Krefenstein, Sergej - Brustkern, Juergen | 2.15 | 2025.04.20 Brustkern, Juergen (4602676) (2093) | 1 | 94.90% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2025.04.19 | Round 1: Krefenstein, Sergej - Matviienko, Mykhailo | 1.13 | 2025.04.19 Matviienko, Mykhailo (14194287) (2159) | 0 | 90.50% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| Round 9: Rodriguez Klasen, Ennio - Krefenstein, Sergej | 9.5 | Rodriguez Klasen, Ennio (16277414) (1950) | 0 | 91.30% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | ||
| 2023.12.28 | Round 3: Sergej Krefenstein - Jonas Förster | 2023.12.28 Jonas Förster | ½ | 95.00% | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 | ||
| 2023.07.17 | Round 3: Aaron Matthes - Sergej Krefenstein | 2023.07.17 Aaron Matthes | 0 | 87.00% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 |