this might be a little late, but today, after playing this game on and off for about 2years, I finally won the game twice in a row.
My strategy is as follows: Always try to "lose" as few numbers as possible. I will try to give an example down here.
TL: Top Left
TR: Top Right
BL: Bottom Left
BR: Bottom Right
If you have on your TL a , in your TR a  ...