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Bent Riders. A discussion of pieces, like the Gryphon, that take a step then move as riders.[All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on Sun, Apr 19, 2020 07:13 AM UTC:

Hello all. I'm reading the thread with some days late. I believe I can answer some questions. You have to know that Sonja Musser from the USA, has defended her PhD on the Libro de los Juegos, the Alfonso X's codex, few years ago. On that particular aspect of the Grant Acedrex, I worked with her analysing the Spanish text. Sonja and I speak Spanish. The language used here is a medieval Spanish but it is not a big problem to understand it because that medieval Spanish has more latin roots than the modern one. 
You can find the full text on the web and large extracts concerning our Grant Acedrex on my own website here (Spanish text AND Sonja's English translation) : http://history.chess.free.fr/acedrex.htm

The original text and a litteral translation are also given in A World Of Chess, my most recent book.

You will see that we had 2 possible interpretations for the Unicornio, which is clearly a Rhinoceros, nothing else, in the mind of the author of the 13th century. When writing A World Of Chess with my mate Rick Knowlton, we considered it again, and Rick finally convinced me that the most probable interpretation is the more natural N-then-B. I will try to update my website today.
I have studied Murray's a lot and owe a strong respect to his work. What he did is unsurpassed. No one can do something like this today. That being said, Murray's look on chess variants was not very deep. He did not have a lot of estimate for them, being more attracted by chess and its direct ancestors. He made several mistakes, especially on Grant Acedrex, but also on others like Ciccolini's chess. Having access to original sources we have corrected many small details like this in our book A World Of Chess.

To answer the last question from Fergus whether the Unicornio was capturing or not on its initial N's move: Murray affirms that cannot, but the text does not say that. The text says: 

"corre mucho desque comienca & faze ante en salto en trauiesso como Cauallo. & assi lo establecieron en este acedrex que anda el primer salto como Cauallo & depues en sosquino como la Cocatriz fata do quisiere; o que tome. E daquella casa o salta non puede tornar a tras si non yr siempre adelante." (in these times they used an u for a v)

Which means (literal translation)

it runs a lot when it begins and begins with a sideward jump like a horse, and so does it in this chess. It goes the first jump like a Horse and then goes in corner like the Crocodile does when it wants to go or take. And from that square where it jumps, it may not turn back, it shall always go forward.

In Grant Acedrex, the Crocodile moves as the MODERN Bishop. (Bishop at that time was an Alfil). 

Could the Rhino take when jumping as a Knight? Personally I believe yes, but nobody knows.

We have no more information. People from 21st century shall realise that those of the 13th century didn't have the Internet and a community of chessvariant enthusiasts to comment and discuss any tiny points of the rules :=) 

Hope this helps.