For convekta.com/downloads, This is Better than books to increase your chess skills. There are 13 great Demos to download. Don't miss out on these great free training Demos. You can learn a lot in a short time.
The Chess Mentor Demo. This demo contains a selection of 41 challenges culled from the Chess Mentor library. For the beginner, there are challenges selected to illustrate how the pieces move. For the intermediate level user there is a selection of tactical examples. These range in difficulty from problems aimed at the novice player to some that would challenge a club-level player (Elo 1700+). For the advanced user there is some very sophisticated challenges.