Hmm...I think simply showing the promotion options with a highlighted background is better. The plus and minus don't really tell me what my choices are (they are basically covering up the images), but do better at showing that a promotion option exists.
Personally, I'd omit the markers and highlight the background with the same color that is used for Chess-style promotions (#8080FF), while also showing instructions at the top (e.g. "Click icon of piece of choice").
Perhaps the color for promotion highlights could even be set with a parameter (e.g. promoHighlight=#8080FF) in case the selected board shades are too similar to the default color.
P.S. Also, it would be really nice to be able to deselect a piece in the holdings like you can with pieces on the board. Currently, this is not possible.
Hmm...I think simply showing the promotion options with a highlighted background is better. The plus and minus don't really tell me what my choices are (they are basically covering up the images), but do better at showing that a promotion option exists.
Personally, I'd omit the markers and highlight the background with the same color that is used for Chess-style promotions (#8080FF), while also showing instructions at the top (e.g. "Click icon of piece of choice").
Perhaps the color for promotion highlights could even be set with a parameter (e.g. promoHighlight=#8080FF) in case the selected board shades are too similar to the default color.
P.S. Also, it would be really nice to be able to deselect a piece in the holdings like you can with pieces on the board. Currently, this is not possible.