You say unexpected positive outcome I say good luck. Luck is easier to say and write. Like "It took several unexpected positive outcomes for us to win" vs "We were lucky to win." The latter works just fine for me.
Of course it is.
Just so long that we can agree that luck isn't some mystical magical force that for whatever reason decided it liked you better that day than the other guy.
And to bring it back full circle, we weren't lucky to win. We found ourselves on the negative end of several unexpected outcomes and still had enough positive outcomes to outscore the other team in the end thanks to our preparation and hard work.