Sicilian Defense: Kopec System
1. e4 c5 2. Nf3 d6 3. Bd3
The Sicilian Defense: Kopec System is a chess opening classified as ECO B50, reached after 1. e4 c5 2. Nf3 d6 3. Bd3. It is a line of the Sicilian Defense. Black is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 185 times by this move order. White won 41%, 3% were drawn and Black won 56%. The most popular continuation is 3… Nc6 (38% of games).
Engine evaluation: +0.14 (Stockfish, depth 38; best line 3… g6 4. c3 Nc6 5. O-O Nf6 6. Bc2)
- ECO
- B50
- Moves
- 5 plies
- FEN
rnbqkbnr/pp2pppp/3p4/2p5/4P3/3B1N2/PPPP1PPP/RNBQK2R b KQkq - 1 3- PGN
1. e4 c5 2. Nf3 d6 3. Bd3
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 66 | |
| 1500-1999 | 86 | |
| 2000+ | 33 | |
| All | 185 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 3… Nc6 | 70 (38%) | |
| 3… Nf6 | 59 (32%) | |
| 3… e5 | 16 (9%) | |
| 3… g6 | 14 (8%) | |
| 3… e6 | 11 (6%) | |
| 3… a6 | 7 (4%) | |
| 3… Bg4 | 6 (3%) | |
| 3… h6 | 1 (1%) |
Master games
121 over-the-board games are classified under this line (White 50%, draw 22%, Black 28%). The strongest:
- GM Richard Rapport (2776) – GM Radoslaw Wojtaszek (2696) 1-0 · Superbet Rapid 2022 · 2022-05-21
- GM Richard Rapport (2763) – GM Andrei Volokitin (2677) 1/2-1/2 · World Rapid 2021 · 2021-12-28
- GM Alan Pichot (2648) – GM Ian Nepomniachtchi (2771) 0-1 · Titled Tue 5th Sep Late · 2023-09-05
- GM Richard Rapport (2763) – GM Kirill Shevchenko (2655) 1-0 · World Rapid 2021 · 2021-12-28
- GM Sergey Karjakin (2743) – GM Ivan Cheparinov (2664) 1/2-1/2 · World Blitz 2021 · 2021-12-30
Search all games of the Sicilian Defense: Kopec System and its sub-variations
Highest-rated Lichess games
- champyinz21 (2372) – KrUeL (2432) 1-0 · 2026-09-01 · 180 + 0s
- champyinz21 (2364) – Marat1310 (2371) 0-1 · 2026-09-06 · 180 + 0s
- orcaguy (2440) – Astrocreator (2268) 1-0 · 2026-09-07 · 600 + 0s
Comes from
Sicilian Defense: Modern Variations 1. e4 c5 2. Nf3 d6
More Sicilian Defense lines (all)
- Sicilian Defense (1. e4 c5) B20
- Sicilian Defense: Amazon Attack B20
- Sicilian Defense: Big Clamp Formation B20
- Sicilian Defense: Bowdler Attack B20
- Sicilian Defense: Brick Variation B20
- Sicilian Defense: Czerniak Attack B20
- Sicilian Defense: Czerniak Attack, Queen Fianchetto Variation B20
- Sicilian Defense: Euwe Attack, Prins Gambit B20
- Sicilian Defense: Gloria Variation B20
- Sicilian Defense: Grob Variation B20
- Sicilian Defense: Keres Variation B20
- Sicilian Defense: King David's Opening B20
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.