Based on the best-selling book 25 Bridge Conventions You Should Know, "part 3: Sophisticated Stuff" includes the following 18: Lebensohl Chapter 19: Reverse Drury Chapter 20: Roman Key Card Blackwood Chapter 21: Fourth-suit forcing Chapter 22: New minor forcing Chapter 23: Ogust responses to weak two-bids Chapter 24: Responsive doubles Chapter 25: Lead-directing doubles For the remaining conventions, look for these Bridge Conventions You Should Know - Part 1: Learn These First25 Bridge Conventions You Should Know - Part 2: More Complicated