Chessumo comes from Murray LLC. It's a point scoring puzzle game.  All pieces can attack any other piece.  Points are scored by pushing pieces off the board, just like in sumo wrestling.
  Pushing 1 piece gains 1 point.
Pushing 2 pieces gains 5 points.
3 pieces nets 14 points.

After your piece makes a move, it is dead and can no longer move.  Unless, another piece pushes it within the grid, but not off the board.

It took me more time than I care to admit, that I figured these rules out.

At first, I did not like this game. Then I saw a monster score on the Leaderboard and tinkered more.

Chessumo definitely has an element of luck. Bad luck often comes when pawns and bishops appear.  However, this is a very solid game.  At the moment, my high score is over 500.
https://itunes.apple.com/us/app/chessumo/id1265923253"mt=8

http://chessumo.com/

Other chess-like puzzles that I've blogged about:Solitaire Chess - my favorite from this listOvergrownPirate RingBoard: Chess PuzzleBlip BlurpKnight TradeTroyisMate in 3" Ok!Chess Puzzle of the DayChess Free Ruby CaptureChessQuestBlind KnightsIntersectionChess Light - very goodNo More KingsMarch Simple Chess
Knights

Other Point Scoring Games Worthy of Your Time (Some are no longer available.)
NumberMania
Four Straight Lines
Pushopolous
Stickets
Folt
Nineout
Nineout II
BeeCells Lite
Kindly Colors
HexAgony
Domino Drop
Put Number
Tripevo
Triple Town
Kindly  Col...