Modbury School sent us some ideas for this activity.
Make a triangle with a hollow middle, then fill the middle dot in the top line and wait for the computer to make its desicion.
I think you mean like this:
Then go in the opposite position,
You win, every time you decide you want to win.
USE THAT METHOD TO WIN.
Our soloution is to go three across one down in the centre of your three and when your other opponent goes for one of the squares you will always have another square to go to.
I think you mean something that looks like this:
Yes, that's a very good strategy as it means there are three possible squares to make with your next move (can you see where the three are?).
Thank you all who were involved at Modbury, we hope to hear from you again.