It is about the book RETROSPECTIVE CHESS PROBLEMS made application.

All solutions are explained in detail.

There is a section for voluntary donations but it is not necessary to make any donation to have the complete book.

There are 6 example problems before 76; Of these, the first 30 are easy and the remaining 56 are of medium or high difficulty.

Although an internet connection is required, you just have to take a screenshot of the problem and you can go offline and solve it by viewing the screenshot of the diagram.

All the solutions are explained very step by step and in detail.

I suppose you know what retrospective chess is all about. If not, it is about answering a question for which you must think about what had to happen in the past of the game. All the positions correspond to legal positions that have been or could be given in chess games strictly following the rules of this game.

None of these problems can be solved by a computer.

I hope you enjoy a lot in its resolution as well as that you put a review in which you indicate what you like and what you don't like about the application.

Thanks a lot.