All Questions
Tagged with tic-tac-toe game
15 questions
11
votes
1
answer
1k
views
Pigpen Tic-Tac-Toe
This puzzle is part of the Monthly Topic Challenge #3: Pencil and Paper Games
Introducing a new tic-tac-toe variant of my own devising (at least I haven't found an equivalent anywhere online).
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- 159k
14
votes
2
answers
863
views
Decision Paralysis
This puzzle is part of the Monthly Topic Challenge #1: Restricted Title: xkcd 1xxx and is based on https://xkcd.com/1801/.
Protip: If you ever need to defeat me, just give me two very similar options ...
- 21.5k
3
votes
1
answer
367
views
Harary's generalized Tic-Tac-Toe; Winning strategy for Skinny on a 7 x 7 board?
Disclaimer: The purpose of this post is a ask question, not to offer a puzzle. Still, there are some puzzles here for the reader's pleasure.
Disclaimer 2: This question was also asked on Math Stack ...
- 33k
19
votes
1
answer
2k
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Blindfold Tic-Tac-Toe
You are playing the classic game of 3x3 Tic-Tac-Toe. You are blindfolded and you cannot see the grid, while your opponent can see it. When making a move you call out a cell. If that cell is taken you ...
- 38.7k
5
votes
1
answer
274
views
Playing tic-tac-toe by submitting your moves in advance
Suppose that, instead of playing in your turn, you have to submit in advance, an ordered list of the 9 board positions. Then a computer plays for you by using, whenever it is your turn, the leftmost ...
2
votes
0
answers
892
views
How do you force a win in 4x4x4 TicTacToe
I have read in the wikipedia page of TicTacToe that it is possible for the first player to force a win in a 4x4x4 board. I tried to find a strategy on how to do it online but failed. So, how do you ...
- 766
10
votes
2
answers
684
views
Buzzword Bingo Boss Battle!
Two bosses of different companies take turns delivering long speeches. Every speech much “claim” at least one unused square by uttering the corresponding buzzword(s) in the table below. Victory is ...
- 7,862
18
votes
1
answer
640
views
Noughts and Crosses puzzle
Eques and Knott are playing a game of standard 3x3 Noughts and Crosses. At no stage of the game has Eques threatened to complete a row of three on his very next turn.
Suddenly Knott realises he must ...
- 7,862
17
votes
2
answers
2k
views
Tic-Tac-Toe Without a Predefined Board
On a warm and uneventful summer day, John and Mary passed the time by playing games of Tic-Tac-Toe, taking sticks and drawing in the soil. John and Mary are both child prodigies, so within two rounds ...
- 10k
11
votes
1
answer
765
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A Tic-Tac-Toe variant with three marks - winning strategy and chances
We start with a usual $3 \times 3$ grid, $3$ different marks (say, $X, O, I$) and $2$ players.
Player $A$ has to make a vertical, horizontal or diagonal line made of $3$ identical marks (XXX, OOO or ...
- 1,007
8
votes
1
answer
1k
views
Tic Tac Toe Recursive
Related: Connect 4 Recursive
We have a mega tic tac toe grid. Each of the nine cells of the mega grid has a smaller tic tac toe grid. In total we have 81 cells that can be filled. (Maybe imagine a ...
- 7,236
21
votes
2
answers
1k
views
Titanicker Tic-Tac-Toe
This is something of a follow-on to Hugh Meyer's enjoyable "Titanic Tic-Tac-Toe." Fortunately, our intrepid heroes Xavier and Oliver have wrested away a bit of wreckage that some fellow named Jack was ...
- 794
36
votes
1
answer
2k
views
Titanic Tic-Tac-Toe
Xavier and Oliver were playing tic-tac-toe on the Titanic using a wooden board and metal X's and O's. As the stern of the ship sank lower and lower
they found, to their annoyance, that the pieces ...
- 23.8k
7
votes
2
answers
2k
views
What is the smallest tic-tac-toe board to have a winning strategy?
There is not winning strategy for 9cell 3x3 board.
There is a winning strategy for 16cell 4x4 board, or even for 10cell "3x3 + 1_cell_near_a_corner" board (see M.Gardner "Mathematical games"):
$$
\...
- 16.6k
43
votes
6
answers
27k
views
What is the optimal first move in tic-tac-toe?
I have been told that it is possible to guarantee no worse than a tie in normal 3x3 tic-tac-toe, but that the first move is very important. What is that important first move?
- 3,720