This collection of chess problems and combinations is a continuation of the Reshebnikov series. You have matured, so the tasks have become more difficult. This collection presents two topics: Double blow and bunch. No chess game is complete without these tactics. Both a bunch and a double blow can meet both in an early debut and in a deep endgame. Do not doubt that, having solved all the tasks from this book, you will love simple positions. And then it will not be difficult for you to build a chess "bridge," "square" and "ladder." And at the right time - you will be able to drive the enemy into zugzwang. At the end of the game, you will definitely meet all the tactics studied in the first three books.