You are now playing against a different strategy. I won't explain how it works, but I will tell you it is called the Massive Retaliatory Strike strategy. Play the game a few times (reload the page to start again) and you will see how this strategy works.
Remember that you are not trying to beat the computer, just get as many points as you can for yourself. Once you settle on a strategy to achieve that, move on to the next page.
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