I have added several changes. First, I made it possible to access game board and reset button with Tab key. If a cell is focused, a red border appears. If a reset button is focused, a blue border appears. Inside the game board, arrowkeys are used to navigate in the the board, making the border of the focused cell red. Both Enter and Space are used to play a mark on the focused cell. To activate the reset button, use Tab to focus the reset button, and run the button with Enter.