Tree path 5 levels King's Pawn Game › Sicilian Defense › Sicilian Defense › O'Kelly Variation › Yerevan System
- Chess Codex
- King's Pawn Game B00
- Sicilian Defense B20
- Sicilian Defense B27
- O'Kelly Variation B28
- Yerevan System B28 you are here
Sicilian Defense: O'Kelly Variation, Yerevan System
Overview
Sicilian Defense: O'Kelly Variation, Yerevan System is a named branch in the Semi-Open Games group of chess theory, classified under ECO B28.
The Semi-Open Games group covers semi-open games — replies to 1.e4 where Black declines the symmetrical 1…e5 in favour of an asymmetric pawn structure.
The line arises from 5 plies — specifically the moves 1. e4 c5 2. Nf3 a6 3. Nc3.
In the opening tree, this line branches off from Sicilian Defense: O'Kelly Variation, part of the broader King's Pawn Game system.
Use the board to walk through every move, check how the position has scored on Lichess, or take it head-to-head against Stockfish.
- ECO code
- B28
- Group
- Semi-Open Games (B)
- Plies
- 5
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
658,849 games · White 46.8% / Draw 4.7% / Black 48.5%
| Moves | Games | W / D / B |
|---|---|---|
| e6 | 198,627 | |
| Nc6 | 160,106 | |
| b5 | 159,272 | |
| d6 | 100,512 | |
| g6 | 19,255 | |
| Nf6 | 7,364 | |
| h6 | 7,058 | |
| b6 | 2,640 |
Source: Lichess Opening Explorer · cached 2026-09-26 01:08:24
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Submissions are reviewed before publishing.