Current position
Rat Defense: Harmonist
1.e4 d6 2.f4
The Rat Defense starts with 1.e4 d6 2.f4 and is catalogued under ECO B00, in the semi-open games half of the book. The catalog indexes 11 lines inside it, grouped into 11 named variations, and the position after those moves has 1 playable continuation to walk from here.
Root edges show how often each move is played around your Elo. Use the arrow on a position to reveal the next replies.
Current setup
Move ideas
Claims the center with a pawn and opens lines for the queen and king’s bishop.
Idea: Build quick development and make early castling possible.
Advances to d6 to claim central space and control nearby key squares.
Idea: Give the pieces room to develop behind a durable central foothold.
Advances the f-pawn to gain kingside space and control new squares.
Idea: Create useful wing space while keeping the central structure flexible.
Advances to d5 to claim central space and control nearby key squares.
Idea: Give the pieces room to develop behind a durable central foothold.
Waiting for Lichess game popularity.
Each line below is an indexed entry under Rat Defense. Open one to load it on the board and keep exploring from that position.
ECO groups openings by the structures they lead to, so these families tend to share plans with the Rat Defense.