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'Coordinate Cunning' printed from http://nrich.maths.org/

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This month's game is linked with our World of Tan. It is for 2 players. Little Mai and Little Fung explain how you play:

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LM: First you must decide where to place the origin, (0,0). It can be anywhere.

LF: Now you must decide who is blue and who is red.

LM: Blue goes first and chooses a point. Blue has to state the position of their chosen point in relation to the origin.

LF: BUT, if you get the coordinates of the dot wrong, you don't get that point.

LM: And you lose a go.

LF: Red now chooses a point and gives its coordinates.

LM: You then take it turns to go?

LF: Until one person has four dots in line of their colour.