Sam has closed his piano and gone to bed ... now we can talk about the real stuff of life ... love, liberty and games such as Janus, Capablanca Random, Embassy Chess & the odd mention of other 10x8 variants is welcome too
For posting: - invitations to games (you can also use the New Game menu or for particular games: Janus; Capablanca Random; or Embassy) - information about upcoming tournaments - disussion of games (please limit this to completed games or discussion on how a game has arrived at a certain position ... speculation on who has an advantage or the benefits of potential moves is not permitted while that particular game is in progress) - links to interesting related sites (non-promotional)
In the historical framework, the en passant move was really the French's "pet peeve". Even while Paul Morphy was still playing, en passant was not universally agreed upon, although most players did play this way. Howard Staunton was instrumental in getting the rules and standards written down, and I think it was 1881 that the official description on en passant made its way into "chess law."
The most interesting evolution I think was that concerning castling. The Italian players wanted the king to move ANY two squares, with the ability to place the rook next to wherever the king landed! Now that would be confusing! I think it took 80 years for the "freeformers" to be tamed to just horizontal movements of the king.