Having played them all, Im finding the a.i. in Beyond the sword the best in any civ game, granted Ive yet to get deep into the modern era. Played 4 games on monarch and yet to win, and Ive played civ games for years. The a.i seems to have mad production rates and Im wondering how high are those bonuses on monarch level these days? That said CONGRATS to the civ programmers, Beyond the sword really made civ 4 fun, imo.