Tree path 4 levels King's Pawn Game › Pirc Defense › Rat Defense: Harmonist › Rat Defense: Fuller Gambit
- Chess Codex
- King's Pawn Game B00
- Pirc Defense B00
- Rat Defense: Harmonist B00
- Rat Defense: Fuller Gambit B00 you are here
Rat Defense: Fuller Gambit
Overview
Rat Defense: Fuller Gambit is a gambit, classified under ECO code B00 within the Semi-Open Games family. As with all gambits, one side sacrifices material early — usually a pawn — in exchange for development, open lines, or initiative.
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.
It is reached after 6 plies of play, with the move sequence 1. e4 d6 2. f4 d5 3. exd5 Nf6.
It is a variation of Rat Defense: Harmonist, which itself descends from the root opening King's Pawn Game.
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
- B00
- Group
- Semi-Open Games (B)
- Plies
- 6
- Parent
- Rat Defense: Harmonist
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
3,271 games · White 47.0% / Draw 4.6% / Black 48.5%
| Moves | Games | W / D / B |
|---|---|---|
| c4 | 1,069 | |
| Nf3 | 990 | |
| Nc3 | 571 | |
| d4 | 325 | |
| Bb5+ | 154 | |
| Bc4 | 128 | |
| d6 | 18 | |
| d3 | 8 |
Source: Lichess Opening Explorer · cached 2026-09-26 01:18:27
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