# Solving Otrio

Edit from the future: I was super humbled when the creator of the game, Brady, instructed me that I had been playing the game incorrectly. Therefore all of what is below is based off of an improper ruleset to the game. The real rules make the game much deeper (and less obviously solvable)

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I was gifted a game from the Marbles Brain Store for holidays this year called Otrio.

Its based off of Tic-Tac-Toe where a row of three O’s that are the same or ascending/descending in size or three concentric O’s gives victory. Below are some examples of victories:

Its unfortunately also based on a easily solved game, tick-tac-toe. After about ten minutes we determined that player one cannot lose if they play correctly. Here the solutions:

## 12 thoughts on “Solving Otrio”

Hello there! As the inventor of Otrio i came across your post. We also figured out that w/ 2 players and using only 2 sets the first person can always win quickly. That’s why we chose to make the rules for a 2 player game use all 4 sets, w/ each player using 2 sets across from each other (not adjacent). We found that this eliminated the first player advantage and made for much better gameplay (tho i personally like the 4 person game the best). Hope you enjoy the game and thanks for playing!

• Hah how embarrassing for me! I guess step one should have been reading the rules more closely! Thank you for your response, I’ll give it another try 🙂

• You’re actually one of the top results for Otrio right now, so it might be worth it to put an update at the top of the post itself about your error.

But like Brady said, it’s best with 4 people because you play without any ‘table talk’ addressing strategy or what moves are able to win, so when you play with a novice or younger kid, the game is actually more exciting because you’re not sure whether you ought to block a win for a person following them or advance yourself, but risk them giving a win to someone else.

If you play with four experienced people, you’ll want to make the turn order go something other than clockwise/counter clockwise because it’s harder to keep track of who to block.

• Absolutely! I totally had something written and then got distracted trying to write an AI for the game hah

I do like that idea a lot though. Even not excluding yourself could be fun

• Johnnyg says:

Brady are you out of Chicago?

2. Bob says:

3 person

The first player always wins if they put a medium ring in the center square as well

3. jaren says:

So true! I have been playing with my son, one on one, only one color each, and the first player ALWAYS wins. I thought for sure there must be some genius way to overcome this, but I have yet to find one.

• jaren says:

just to clarify… yes, medium ring in the center square on the first move will win every time.

4. J says:

I don’t understand how to “read” the animations. Why are there two players but three colors?

• J says:

OK, I figured out that the third color represents all the positions the player can use to win. But it would have been better if you wrote that instead of only having the gifs… It’s 2 am here, and I don’t want to bother my mind with that kind of complicated reasoning… 😉

5. Ryan Sanders says: