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The best technique is to try and get as many numbers closest to zero as possible. When you have a number in the centre of the board, it opens up more opportunities to get three in a row. Let's say you get a zero. You have 8 different directions you can go. You could go left, right, up, down or in any diagonal way. If you had a number in the corner, you only have three possible directions you can go. The most likely chance of winning is if you get a number as close as possible or get the number zero.