For the ChessWebPart, I'm using a well-known opensource javascript chess game for P4wn project.

Unfortunately, not very strong engine, but it is pure js, so what do you want?! :)

Originally, the game look like this:

From this point, to integrate this chess into SharePoint, you could eigher use this whole look, or take only the board, and create contextual tab for the buttons and options.

So, you know which variant I preferred, don't you? :)

I ended up with pretty cool look:

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