The passing years bring progress and innovation in every aspect of our lives. Bridge is no exception. Although the play of the hand by experts and good players was already at a very high level 25 or 50 years ago, the same cannot be said for bidding methods. Auctions in those "old days" were primitive compared with what today's players use. Now many club and tournament players have adopted sophisticated systems, and they can bid more accurately than most experts in the past.

This 12-page informational / reference pamphlet is full of information.