What is the expert rule? I have french edition and my french is rather rusty.
This rule is recommended only for 3 or 4 players and allows tactical control of when Provinces are available.
1*. CHOOSE WHICH PROVINCES ARE AUCTIONED
At the start of the game after shuffling the Province deck, deal 3 Province cards to each player. Put the others in the box without looking at them.
Players keep these cards secret from each other. At the beginning of each turn, each player chooses one Province card, then the chosen cards are all revealed simultaneously. These are the Provinces that are available at the auction this Round.
At the beginning of the New Kingdom, the Provinces cards that were played during the Old Kingdom are shuffled and redistributed equally to players.
bidding jump card is way too weak compared to other cards.
Not if used strategically. They are generally best in the final round of each era. Say there's a province that could potentially make someone 20 money. Bid 10 for it, and throw down that card. If someone bids 21, you're lowering their score. If no one outbids you, you can make that profit.
Alternately, you see another player clearly needs that province. Throw a 3 or 6 bid on it and throw down that card to force them to pay 10 or 15 on it.
Very useful card in my opinion.