Without seeing an example of what you've done so far, we can't tell you what could be improved.

It's kind of hard to judge without knowing what you have already. Also, this was a bit vague. Are we talking about an accessible board and pieces or a computer program?

Yeah uh... we need to see what you're working on in order to give feedback

Without knowing what you are working on, here are some of the features I would like to see in any accessible chess app:

* The ability to navigate the board with arrow keys.
* Multiple methods for inputting moves (chess notation or select / drop pieces with the enter key for instance)
* Support for the major chess platforms that currently exist (no walled garden blind chess arenas please)
* A visible, high contrast board.
* moves announced when they are made and stored in a history buffer that can be traversed to read the progression of the game.
* Check, checkmate, and any illegal move announced by the game.

I think this would be a good place to start. Thankfully chess apps seem like they would be pretty simple to make even using a language like Python. The hurdle will probably be the interface. Modules like $1 will probably be helpful if you are using Python. Hope this helps!

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If it does have a cisual aspect, make sure it has a dark mode. Some forms of blindness is from photophobia and the white pieces and tiles could cause difficulty.