[douglas]

I tested it a bit earlier, and save games appear to be fully compatible between Gold 1.91 and Deluxe 1.94. I can't guarantee there's no obscure change that would cause problems in certain specific circumstances, but I doubt upgrading to Deluxe will affect your ability to play PBW games that haven't upgraded. I tested playing in 1.91 and hosting in 1.94, playing in 1.94 and hosting in 1.91, and switching host and player versions in midgame, and had no problems, though I only played for a few turns.