Do you want to improve your chess? Then you must solve lots of tactical puzzles.
iChess was developed exactly for this reason
☆ Analyze with the power of two Chess engines!
☆ 3 Levels (Normal, Advanced & Master)
☆ More than 1250 puzzles, all offline!
☆ Load your own puzzles file in PGN format
…and 10 more features!
Isn’t it quite ironic to call a game for the android platform, iChess? 
ha ha ha 
My blogpost on why the name iChess http://mychessapps.blogspot.in/2011/09/why-name-ichess.html
Based on real tournament? cool!
Installed it, will respond later after some plays.
yes indeed. Most of the puzzles across Normal, Advanced & Master levels are from 2011 GM tournaments.
More than 600 puzzles from July, August 2012 tournaments are available as In-app purchase.
HOW DO I WIN???
