Daily Shaarli
May 17, 2019
A site with a bunch of abstract strategy games (implemented in mod_perl!)
A very short introduction for western chess players, but includes an English bibliography that looks good.
Difficulty of various games for computers.
And a short intro to shogi for western chess players.
At Play in Chinatown's Backyard; Eastern Chess Meets Western Basketball Under the Mulberries - The New York Times

More on Xiangqi in Columbus Park
Some free English-language Xiangqi books.
Some Xiangqi games annotated in English!
Long article about Chinese Chess at New York's Columbus Park.