The Buddha preached the Noble Eight fold path.
Eight pillars of thinking and behaving that would help you become the better person you want to be.
The 7th of the Eight Noble Paths is Right Mindfulness.
Namely...
What is IN your mind, what you let into it, and how, and in what way, does it help you.
You can get a more professorial, academic, loftier explanation if you scour the Internet, consult the thousands of books, periodicals, and information that's freely available... though that may take you away from the practicality of it all, the essence of living a good life, in the here and now.
And so here's something that you can perfect from having a no mind scenario when the stakes are high.
And interestingly, it comes not from the Buddha, but from Chuang Tzu, who in fact, DOES have a Buddha mind, a powerful one at that;
"When you are betting for stones in an archery contest, you shoot with skill.
When you are betting for fancy belt buckles, you worry about your aim.
And when you are betting for real gold, you're a nervous wreck.
Your skill is the same in all three cases - but one prize means more to you than another, so you let outside concerns weigh on your mind.
He who looks too hard at the outside gets clumsy on the inside."
Right mindfulness here, means... having no mind and no tension about the stakes you're playing for.
...where you think inside, you're playing for stones and pebbles, no matter what the stakes, you'll experience a peaceful relaxation in getting to the glorious outcome you want.
But look, don't just believe what you read - test it, experiment with it, work it. Be the judge and jury based on your own detective work and in your own efforts and application.