Local wins are not valuable if they cannot be used to win the global board-in fact, it may be strategic to sacrifice a local board to your opponent in order to win a more important local board yourself. This means that each local move played is not intended to win the local board, but to win the global board. It is governed only by actions that occur in local boards. Winning the game: Due to the rules of ultimate tic-tac-toe, the global board is never directly affected.This makes the game tree difficult to visualize, possibly leaving many possible paths overlooked. Future board positions are no longer interchangeable, each move leading to starkly different possible future positions. Each move determines the next move, and therefore reading ahead-predicting future moves-follows a much less linear path. Visualizing the game tree: Visualizing future branches of the game tree is more difficult than single board tic-tac-toe.Therefore, players are forced to consider the larger game board instead of simply focusing on the local board. This might make moves that may be considered bad in normal tic-tac-toe viable, since the opponent is sent to another local board, and may be unable to immediately respond to them. Anticipating the next move: Each move played in a local board determines where the opponent's next move may be played.Even though every move must be played in a local board, equivalent to a normal tic-tac-toe board, each move must take into account the global board in several ways: This is because of the complicated game branching in this game. Ultimate tic-tac-toe is significantly more complex than most other variations of tic-tac-toe, as there is no clear strategy to playing. This is most effectively done by randomly generating a 5-digit number, then using the first digit to select a global box and the next four digits to place "X"s and "O"s in the appropriate local box. If playing with this rule set is still preferred, the forced-win problem can be practically solved by generating the first 4 moves at random. It was shown in 2020 that this set of rules for the game admits a winning strategy for the first player to move, meaning that the first player to move can always win assuming perfect play. This is up to the players on which rule to follow. This allows the game to last longer and involves further strategic moves. Īnother version for the game allows players to continue playing in already won boxes if there are still empty spaces. Game play ends when either a player wins the global board or there are no legal moves remaining, in which case the game is a draw. If a player is sent to such a board, then that player may play in any other board. Once a local board is won by a player or it is filled completely, no more moves may be played in that board. If a move is played so that it is to win a local board by the rules of normal tic-tac-toe, then the entire local board is marked as a victory for the player in the global board. O can then play in any one of the nine available spots in that local board, each move sending X to a different local board. For example, if X played in the top right square of their local board, then O needs to play next in the local board at the top right of the global board. This move "sends" their opponent to its relative location. The game starts with X playing wherever they want in any of the 81 empty spots. Rules Įach small 3 × 3 tic-tac-toe board is referred to as a local board, and the larger 3 × 3 board is referred to as the global board. Compared to traditional tic-tac-toe, strategy in this game is conceptually more difficult and has proven more challenging for computers. Players take turns playing on the smaller tic-tac-toe boards until one of them wins on the larger tic-tac-toe board. Strategic tic-tac-toe, meta tic-tac-toe, tic-tac-tic-tac-toe-toe, or (tic-tac-toe)² ) is a board game composed of nine tic-tac-toe boards arranged in a 3 × 3 grid. ![]() Ultimate tic-tac-toe (also known as ten-tac-toe, super tic-tac-toe, Since X played in the top-right corner of the local board, O is forced to play their next move in the top-right local board.
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