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Promote to which piece?
Step 1: Set Up Position
The first thing to do is to set up the initial position or import an existing PGN file to edit. You can:

or

or
If you do not have an existing game file or board position with which to start, choose "Manually Enter Position."

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Step 1: Set Up Position
Quick Set Options: 

Clear Board | Set Standard Position

Set Chess960 SPID:

Make black pieces mirror white

Edit Board Position: 

To move a piece, click on the piece and drag it to its new square.

White Pawn White Knight White Bishop White Rook White Queen White King
Black Pawn Black Knight Black Bishop Black Rook Black Queen Black King

To add a piece, drag it from above and release it on the desired square.

To remove a piece, drag it off the board and release it.