Tree path 4 levels Grünfeld Defense › Three Knights Variation › Grünfeld Defense: Three Knights Variation › Petrosian System
- Chess Codex
- Grünfeld Defense D80
- Three Knights Variation D90
- Grünfeld Defense: Three Knights Variation D90
- Petrosian System D91 you are here
Grünfeld Defense: Three Knights Variation, Petrosian System
Overview
Grünfeld Defense: Three Knights Variation, Petrosian System is a variation within the Closed & Semi-Closed Games family, indexed as ECO D91.
The Closed & Semi-Closed Games group covers closed and semi-closed games — 1.d4 systems characterised by long strategic manoeuvring rather than early tactics.
It begins with 9 plies and takes 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5 to reach the canonical position.
It is a variation of Grünfeld Defense: Three Knights Variation, which itself descends from the root opening Grünfeld Defense.
Step through the moves on the interactive board below, review the live Lichess statistics, or play this position against Stockfish at one of six difficulty levels.
- ECO code
- D91
- Group
- Closed & Semi-Closed Games (D)
- Plies
- 9
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
750,786 games · White 48.1% / Draw 6.1% / Black 45.9%
| Moves | Games | W / D / B |
|---|---|---|
| Ne4 | 313,954 | |
| O-O | 148,555 | |
| c6 | 128,185 | |
| dxc4 | 101,220 | |
| e6 | 14,789 | |
| c5 | 14,187 | |
| h6 | 7,117 | |
| Nbd7 | 6,712 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:09:38
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