From my limited experience today; seems that LR always selects Estate (!?!?!???) as the card. This is, obviously, dumb, as Estates are--absent edge cases--the LAST card that should be picked. It would take only 5 minutes to--at the very least--change the programming so that LR always selected Duchy as the card. That would make a million times more sense than selecting Estate.
It is *such* a stupid AI move than it already motivates me to either never buy War Chest in 'bot games, or to just resign...it's not the slightest bit fun to play a game where LR is sabotaging itself to such a large degree.
I would think that, to actually program this card to make the "correct" decision, would be incredibly difficult...would totally depend on which other 5-value cards are in the game, what stage of the game War Chest is being played, the synergy of the various 5 cards to the other kingdom cards, etc.. But, as I wrote before--at the very least, make the game pick a non-idiotic card like Duchy, and never have it pick Estate.