text: Sunil gives a very good explanation of what is going on, though that last step was a little vague to understand.  Here's what I would do:\n\nPick 1 (1)\nOpponent picks 1-8 (2-9)\nPick however many are needed to get the total to 10 (10)\nOpponent picks 1-8 (11-18)\nPick however many are needed to get the total to 19 (19)\nOpponent picks 1-8 (20-27)\nPick however many are needed to get the total to 28 (28)\nOpponent picks 1-8 (29-36)\nPick however many are needed to get the total to 37 (37)\nOpponent picks 1-8 (38-45)\nPick however many are needed to get the total to 46 (46)\nOpponent picks 1-8 (47-54)\nPick however many are needed to get the total to 55 (55)\nOpponent picks 1-8 (56-63)\nPick however many are needed to get the total to 64 (64)\n\nYou win!!\n\nAgain, this is essentially the same strategy as Sunil provided, except this gives you a step by step breakdown of the entire game.