# Is it possible to force an opponent to Win Tic-Tac-Toe? Find out with this Experiment

Subject:

Science

6, 7, 8

Title – REVERSE TIC TAC TOE
By – Judy Schneider
Primary Subject – Science
Secondary Subjects – Science
SCIENCE PROJECT OF THE WEEK

REVERSE TIC TAC TOE

PROBLEM:          Can I make the other person win at Tic Tac Toe?

RESEARCH:

HYPOTHESIS: Do you know how get three in a row? Can you figure out the way to make the other person get three in a row and not get three in a row yourself?

MATERIALS:          pencil and paper

PROCEDURE:
1. Play Tic Tac Toe the regular way to discover the strategy to get three in a row. Remember the object of the game is for you to get three in a row.
2. Look for a second strategy that will make a tie game every time. No one wins when it is a tie.
3. Now try to make the other person win. Both of you must try not to get three in a row.
4. Keep your trials neat, accurate, and save them to turn in as your data. You must do at least 16 trials for each strategy.
5. Number the trials, circle the first move, and indicate if it was a win, lose, or tie game.
NOTE: You can just play Tic Tac Toe and turn in this assignment. However, if you want to complete this assignment and learn from it, LOOK FOR BOTH STRATEGIES.

DATA: Be sure to turn in your game sheet.

QUESTIONS:
1. What is the secret to make the other person win?
2. What is the secret to making the game end in a tie?
3. Are the strategies any different if you are playing the game in reverse?

CONCLUSION: This is not optional. You must explain what you learned by doing this activity.