I am looking for a database of chess problems in electronic format with solutions. Ideal variant will be a database with something like:
- FEN starting position *
- description (Mate in 3 moves, Win material, Black to draw)
- solution *
- strength of the problem
Only * are really needed, other things just nice to have. It does not matter whether the resource is free or paid. Of course I can get some books and extract such positions by myself, but I hope that someone already have done something like this.