What would be the strategy for the game Boxes? (Boxes is the game in which players connect dots on a grid and whoever encloses a box gets a point, along with an extra turn, until all lines are made)
The game Boxes is another form of the game "Dots and Lines" or "Dots and Boxes", where the strategy is understood as a game of early control. The idea is to force the opponent into a condition to draw the third line into a long chain of near-complete boxes, where the ability to complete boxes with the fourth side yourself in a repetitive, connective manner is possible.
Strategy can better be explained on wikipedia, but in general terms details the use of a strategic sacrifice to the opponent to get to collect a few box wins, but be placed into a position to yield much greater returns for yourself because the last required move closes a third side into a long open chain.