MATED
Tools · Board editor

Set up any position by hand

Pick a piece, click a square. Castling rights and the side to move are yours to set, then send the position straight to the engine.

8
7
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5
4
3
2
1a
b
c
d
e
f
g
h
Brush
Position
FEN

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

What is a FEN?

One line of text that describes a whole position: where every piece stands, whose turn it is, and what is still allowed. Chess.com and Lichess will both hand you one from any game, usually under a share or export menu.

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

The starting position, field by field.

Pieces
Each rank from 8 down to 1, separated by slashes. Capitals are white, lowercase black, and a digit is that many empty squares in a row.
Turn
w or b. Whose move it is.
Castling
K and Q for white's kingside and queenside, k and q for black's. A dash means nobody can castle any more.
En passant
The square a pawn could be captured on this move after a two-square push. Usually a dash.
Halfmove clock
Moves since the last capture or pawn move, for the fifty-move rule.
Move number
Which move of the game this is.

If you would rather not type one, set the position up by hand in the board editor and copy the FEN it gives you.