The document discusses practice scenarios for bridge lessons about overcalling opponents and introducing doubles. It provides example hands and explains the appropriate bids in response to an opponent's opening bid. These bids include overcalling in a new suit to show a strong hand, using a takeout double to inquire about a fit in an unbid suit, and jumping to the three level in a new suit or notrump with a very strong hand to show interest in game.

1. NYU Bridge and Spades Club Bridge Lessons - Beginners

2. The Basics of Overcalling Opponents and the Introduction to Doubles Practice Scenarios for Lesson 6