What made 1st edition 'discarded', what are it's differences from 2nd?
And link to 3rd edition is broken, where can i find rules for all
editions?
By the way, i'm not sure that king, wich can give check is really 'first
in history of chess': idea that pinned pieces don't give check was
discussed in 19th century, and such game protected king should give check.
Rook's capture is, of course, also not unique, it strange to read that way
of capturing from world's 3rd popular board game is unique... But i did
not tell that game is bad, i'll try it soon.