Your goal in Five-in-a-row is to get five X's in a row while
preventing your opponent from getting five O's in a row.
In this JavaScript implementation,
the game is played on a 15x15 board.
(If you'd like a bigger or smaller board,
you can set it to any size from 10x10 through 20x20.)
You play X's, and the computer plays O's.
First move is yours. Enjoy!
