I just finished reading the book A Calm Brain, by Gayatri Devi. She describes what happens when getting calm from the bottom up. "Your heart rate and breathing slow down. Deep, slow breaths and a slowed heartbeat send a strong message to the core brain, signaling there is no threat in the environment, and the world is a safe place."
So give it a try tonight and see how it makes you feel. The more you practice being in this position for say 10-20 breaths will have you on the path to a more calm state and a more relaxed mind and body, which will improve your scores immediately! Enjoy the walk...Play the game.