The unique format combines interesting and far-from-easy bridge problems with challenging and equally difficult logic puzzles. It dispenses with bidding procedure and introduces the reader to the increasingly rare genre of the 'par problem', where only one line of play, often exotic but always elegant, will succeed. This singularity is frequently not recognized, and presents a formidable challenge, even to advanced players. What is more, many contracts are bound to fail because declarer, in the heat of the battle, does not identify the key play. This is likely to happen, although the underlying techniques are well known to the more accomplished devotees of the game.