Chesster is an exciting variation of the ancient board game Chess. It's played as a normal 2-player multiplayer game of Chess, but with a significant difference: the board is 5 x 7 tiles instead of the normal 8 x 8. This also means that the number of pieces you have from the start is reduced to 10.
Chesster is played as a hectic version of Chess where time is always ticking away as you ponder your next move. You start with a limited amount of time, but receive extra time for capturing the opponent's pieces. You win the game if you checkmate your opponent, or if they run out of time before you do.
The strategy in Chesster is basically the same as in Chess, but the smaller board creates small differences. Generally the pawns are more valuable in the tight space and limited number of starting pieces, and the Knight is hampered slightly by the restricted space.
Grabbing a piece late in the game is very valuable to add a lot of extra time to your clock. So even if it's just a stray pawn it can add the extra time you need to win.