Exact relative value of chess pieces and fairy chess pieces

With the advent of chess programs and engines, especially self-learning artificial intelligence engines such as AlphaZero and Leela, the search for the exact relative value of chess pieces has become a thing of the past, as artificial intelligence is demonstrating the true dynamic essence of chess, not

Russell Enterprises Archives - British Chess News

If there was a piece in chess that had the same moves (minus castling) as the king, what value would it have? I would put it on par with a knight or

ubdip's Blog • Finding the value of pieces •

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