Rollback between castles during auctions.

It's unlikely that this information would be truly useful for beginners. There are (and often are) situations where you and your opponent are negotiating for different castles. For example, in pairs, it might be Dungeon-Castle, Dungeon-Rampart, etc. It would be more helpful to keep statistics. For example, it would be useful to add items to the standard report form indicating the price at which a castle was bought/sold and its color. And to gradually create a corresponding table.

P.S. It's strange that Ivan doesn't want to share "information." The "daddies" already roughly know in advance which "daddies" they will be negotiating with. And with those who are obviously weaker, what difference does it make whether they know about your preferences in negotiations or not?