"math" chess
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Can't figure it out either. where does this 87 power 87 come from?
Here is what looks like a vietnamese chess board, unfortunately I only found rules in vietnamese :(
Here is an interesting article about Vu Bay and his journey to get "math" chess officially recognized.
http://english.vietnamnet.vn/lifestyle/2007/08/731551/
Although after reading this article, I must admit that I still have no idea what this "math" chess is.