Ultimate Tic Tac Toe

编程小练习——经典OOXX棋（误）井字棋的升级版

规则：

1.棋盘由9块3*3的小棋盘组成，执O和执X的双方轮流落子

2.当某方在任何一个小棋盘内形成三子共线（横or竖or斜），则赢下这个小棋盘，标记为自己的符号

3.当某方赢下的三个小棋盘共线（横or竖or斜），则赢得整局的胜利

4.（关键）任何一方落子的位置将决定对方能够落子的小棋盘：例如，O在某个3*3小棋盘的右上角落子，则X下一步只能在右上方的3*3小棋盘内落子。如果被决定的小棋盘已经决出胜负（或平局），那么下一步将不受限制，可在任意位置落子

5.先手方第一步不能在中央小棋盘落子

一方获胜后，鼠标右键重新开始

升级版井字棋的AI较为复杂，暂不支持人机对战，仅可本地双人对战

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Rules (From Wiki):

Each small 3-by-3 tic-tac-toe board is referred to as a local board, and the larger 3-by-3 board is referred to as the global board.

The game starts with X playing wherever they want in any of the empty spots except the central local board. This move 'sends' their opponent to its relative location. 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. 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.

If a move is played so that it is to win a local board by the rules of normal tic-tac-toe, then it wins that local board.

Once the outcome of a local board is decided (win or draw), no more moves may be played in that board. If a player is sent to such a board, then that player may play in any other board.

Game play ends when either a player wins the global board, or there are no legal moves remaining.

Right click to restart.