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How to play
- Six dots on a hexagon with all fifteen lines between them.
- Take turns colouring one uncoloured line in your colour.
- If you complete a triangle whose three sides are all your colour, you lose. Only triangles with corners on the dots count.
- Ramsey's theorem says someone must make a triangle by the fifteenth line: there are no draws.
- Play the computer on three levels, or two players on one device.
