ChessGenius (OVI version) can only be purchased from the OVI Store. To purchase go to OVI and search for ChessGenius

• Runs on all S60 3rd edition and 5th edition phones
  Supports touch on all S60 5th edition phones
• Small and compact
  ChessGenius.requires only 190 KB on your phone
• Incredibly strong play
  Excellent play even on the 'instant' level. Playing strength is around 2450 Elo
• Thirty playing levels
  Ten easy levels. ChessGenius makes deliberate mistakes
  Ten time based levels. Instant, 1 sec, 2 sec, 3 sec, 5 sec, ... 3 mins
  Ten Blitz levels. Whole game in 1 min, 2 min, 3 min, 5 min, .... 120 min. The Chess Clocks count down in these levels. You lose if you run out of time
• Game information
  The last moves of the game
  Chess Clocks. Total White and Black time and move time
  Main line. For example, the line may show:
  "1.03 05 cxd4 Nxd4 Nc6 Bb5" This means that:
  ChessGenius is winning by 1.03 pawns. Search depth = 5, and line of moves. ChessGenius is planning cxd4 and expects Nxd4 in reply etc
• Set-up position
  Any legal position can be entered
• Take back and Step forward
  Take back moves to start of game and Step forward to end of game.
• Hint
  Let ChessGenius suggest your move
• Players
  Play against ChessGenius, against another player or watch ChessGenius play itself
• Analyze game
  Like 2 player mode but ChessGenius calculates continuously and shows its thinking. Useful for replaying games to see where mistakes have been made or for playing over an imported PGN Master game
• Rules of Chess
  Understands all the rules of Chess including, en-passant, under promotion, castling, draw by repetition and the 50 move rule. Announces a draw if there is insufficient material to win
• Save and Load games
  Games can be saved and loaded in PGN format. Games are saved to the "notes" application and can be edited and transferred
• Tutor option
  ChessGenius will warn if a blunder / weak move is played and give the option of take back
• Chessboard options
  Choose between two chessboard sizes and 6 board colours
• Show legal moves option
  After selecting a piece ChessGenius shows where the piece can move to
• Championship
  A 'Championship' icon is displayed if you have not used Hint, Taken back moves or viewed the Main line. Can you beat ChessGenius without help?
• Supports English, German and French Languages
  Language is selected during installation

ChessGenius has built in help. Select help from the "Options" Menu on the ChessGenius start screen.

To castle move your king two squares to the right or left. If castling is legal ChessGenius will accept the move and move your rook.
Castling is legal if the king and rook have not moved before in the game, the king is not in check and the squares that the king moves through are not attacked. For a better explanation and an excellent tutorial see www.chesscorner.com

This is probably an en passant capture. To find out more see the next question

For an excellent tutorial see the learn section at www.chesscorner.com

ChessGenius saves and loads game in a PGN compatible form that can be understood by almost all desktop chess programs. Games are saved to the Nokia Notes application. Games can be transferred to desktop PC in the same way as any Note. Refer to the Notes application for details.

PGN is "Portable Game Notation", a standard representation of chess game data in ASCII text files. It is used by most Chess software. For full details see: http://www.chessclub.com/help/PGN-spec
Here is a sample game:
[Event "Kasparov vs ChessGenius"]
[Site "London"]
[Date "1994.??.??"]
[Round "1"]
[White "Kasparov"]
[Black "ChessGenius"]
[Result "0-1"]
[ECO "D23/06"]

1. c4 c6 2. d4 d5 3. Nf3 Nf6 4. Qc2 dxc4 5. Qxc4 Bf5 6. Nc3 Nbd7 7. g3 e6 8. Bg2 Be7 9. O-O O-O 10. e3 Ne4 11. Qe2 Qb6 12. Rd1 Rad8 13. Ne1 Ndf6 14. Nxe4 Nxe4 15. f3 Nd6 16. a4 Qb3 17. e4 Bg6 18. Rd3 Qb4 19. b3 Nc8 20. Nc2 Qb6 21. Bf4 c5 22. Be3 cxd4 23. Nxd4 Bc5 24. Rad1 e5 25. Nc2 Rxd3 26. Qxd3 Ne7 27. b4 Bxe3+ 28. Qxe3 Rd8 29. Rxd8+ Qxd8 30. Bf1 b6 31. Qc3 f6 32. Bc4+ Bf7 33. Ne3 Qd4 34. Bxf7+ Kxf7 35. Qb3+ Kf8 36. Kg2 Qd2+ 37. Kh3 Qe2 38. Ng2 h5 39. Qe3 Qc4 40. Qd2 Qe6+ 41. g4 hxg4+ 42. fxg4 Qc4 43. Qe1 Qb3+ 44. Ne3 Qd3 45. Kg3 Qxe4 46. Qd2 Qf4+ 47. Kg2 Qd4 48. Qxd4 exd4 49. Nc4 Nc6 50. b5 Ne5 51. Nd6 d3 52. Kf2 Nxg4+ 53. Ke1 Nxh2 54. Kd2 Nf3+ 55. Kxd3 Ke7 56. Nf5+ Kf7 57. Ke4 Nd2+ 58. Kd5 g5 59. Nd6+ Kg6 60. Kd4 Nb3+ 0-1