khawla said:
should i develop it as 2D game or 3D?

That's easy to answer i think : )

Because very most of your time will go into AI, such minimal graphics are good enough to work on that.
Depending on how the progress is, you may tend to invest in some impressive 3D later, or better stick at simple 2D using images to get it done.

Let your chess program talk a communication protocol, so it can play against other computers or get attached to board-display programs for human play.

https://www.chessprogramming.org/Chess_Engine_Communication_Protocol​

EDIT: Maybe https://www.chessprogramming.org/Protocols​ is the better starting point.

As JoeJ indicated above, there are some very simple (the example given is a string of text) representations that you could use. So, don't get hung up on the visual depiction of the game. It shouldn't affect the logic of the core game anyway. If you keep the visuals separate from the core logic, then you'll be able to swap out the visuals later without having to modify the underlying logic code.

So, go with whatever is fastest for you right now.

Agreed, for a senior project it is really easy to over-scope.

Is your goal AI? There are systems out there where you only provide the AI and the system plays against opponents.

Is your goal to make a standalone game? It is a lot more than what beginners realize but can be a great learning project.

Is your goal to showcase projects that you did in school? Maybe you did a ray tracing project and can draw a raytraced chess board. Maybe you had an emphasis on networking and want to build a networked chess game.

Use whatever you already know. You don't have much time to learn something new. Normally a senior project is about 40 hours of work, meaning a 3-4 credit hour class, but it is professionally only a single work week. If it is a full year project maybe two weeks, and you get a few hours of advice from a teacher. It can feel like the whole wide world is open to you, but really there is a fairly tight time constraint.