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How to achieve this?
With the Gutenberg editor
How to insert a diagram and set-up a position is described in the Chess diagram example.
To insert an arrow marker, click on one of the arrow marker button (a) in the right panel, and drag-drop the arrow on the board between the two wanted squares. To remove the arrow marker, repeat the same operation a second time.
To insert a square marker, click on one of the square marker button (b) in the right panel, and then click on the board square to mark. Again, repeat the same operation a second time to erase the marker.
With the classic editor
How to insert a diagram and set-up a position is described in the Chess diagram example.
Square and arrow markers can be added by setting the csl=... and cal=... attributes on the [fen]...[/fen] shortcode.
The syntax for defining the markers in the same as the one used in PGN games: see the dedicated page for more details on this syntax.