The Ultimate mate in 4 moves chess puzzle app! Sharpen your chess skills with Mate in 4 Puzzles! Experienced players and anyone looking for a good challenge will enjoy solving these chess problems!This app has 1000 interactive chess puzzles that will challenge you. The object is to finish each game by forcing a checkmate in 4 to 8 moves. The puzzles consist of a large number of classical puzzles collected from a variety of sources. These puzzles are fun to play and can be enjoyed at your leisure on your iPhone, iPod touch, and iPad.Mate in 4+ chess problems are especially useful for more advanced chess players or anyone wanting to improve their skills.New features added in Version 2.0 include:------------------------------- Completely revamped chess engine that is much stronger- Timing clock is displayed while you are working on each puzzle. How long you take to solve a puzzle is stored.- New options: more chess piece sets (total of 7) and more colors schemes (total of 7) including wood and marble. (Improved the options menu as well)- Social Gaming: Leaderboards to compare the number of puzzles you have solved with your friends and other players. Facebook integration - including the ability to post your progress and ask your friends for help on a puzzle.- Universal app - works on iPhone, iPod Touch, and iPad - high resolution graphics all around (where supported).For even more chess puzzle challenges check out these apps:- Mate in 1 Puzzles - Mate in 2 Puzzles- Mate in 3 Puzzles