Mindfulness when playing chess

I want to start with this Buddha quote from the Dhammapada > As rain breaks through an ill-thatched house, passion will break > through an unreflecting mind. Ch. 1: The Twin Verses, verse 13 Last night I was playing chess with a close friend and he beat me 4 times consecutively .The first time I almost beat him but my performance worsened linearly .The last time my performance was the worst. Aside from realizing that each time I lost the more I wanted to beat him ,I realized that while playing I was constantly **thinking** about the possible moves and wasn't mindful or aware during the game.Its almost like I was constantly surprised by unanticipated moves Its **during** the game that the feeling of defeat struck me and during this I was thinking about the plan . How can watching and strategic thinking occur,if when I watch there is no thinking?. A fellow here stated that thinking and watching are antagonistic .I think this has some truth as when I watch the thread of thoughts subsides. I think this leads to a more general question and that in any sport or activity that requires a certain skill .How can mindfulness be incorporated during that activity?. I know there are already related questions but,there doesn't seem to be a clear cut answer.