Hi there,
I have previously used this same library on a personal project I developed several months ago. The code is a little tricky, but it is a cool library. I would be very happy to work with you on this project, as I am a keen chess player myself, including fairy chess variants :)
I have an excellent knowledge of javascript, and a good understanding of QA workflows also.
My bid is to provide the 2 new hybrid pieces you requested (chancellor and archbishop), as well as any test cases you require to ensure that the pieces behave as expected. I can see this project taking around 6-8 hours for development, and another 3-4 for writing test cases and testing of the finished library.
I am relatively new to freelancer, but would be very happy to work with you on this. If you have any questions about my proposal, or would like some more information, please feel free to ask.
Regards,
Phillip Wheatley