funny concept but not that much strategy too it. Just spam 1 as long as robots clash on oponents side. If oponent waits for a 3, you either put your own 3 against it and keep spamming 1 right after or put a 4 and keep spamming 1 after. If oponnent puts a 4 and then spams 1 (seems like only working counter to 1 spam), you just wait for it to hit your side and then do the same thing back.
Either AI is too easy or that's really all the strategy in the game ... which gets stale after 3 or 4 matches. Too bad cause it's a great concept!