Chess King is a very affordable (Rs 2,500/- for limited time) and very powerful chess training software. Chess King comes with Houdini 2 - the strongest chess engine on the planet. With Chess King you can solve puzzles, play chess against Houdini, analyse your games, prepare for a particular opponent and access more than the five million game database called GigaKing. Here is a video by Steve Lopez explaining what is Chess King.