井字棋Tic-Tac-Toe

怎么玩井字棋？

井字棋（又叫三连棋、圈叉棋）是世界上最广为人知的策略小游戏之一。棋盘是 3×3 共九格，两位玩家轮流落子——你执 X，电脑执 O。谁先把自己的三枚棋子在横、竖或斜方向连成一条直线，谁就获胜；若九格填满仍无人连线，则为平局。

本作内置两档对手：简单（电脑随机落子，适合放松或带新手）与 困难（电脑使用「极小化极大」算法，永不犯错——你最好的结果是逼平它）。

操作方式

• 点击任意空格放置你的 X，电脑会立即应招。
• 用上方的「简单 / 困难」切换对手强度。
• 每局结束后点击「新一局」继续；累计战绩会保存在本机。

必胜（必不败）策略

1. 先占中心。中心格参与四条连线，是最强的起手位置。
2. 抢角防边。角格参与三条线，价值高于边格。
3. 制造「双威胁」。当你同时有两条即将连成的线时，对手只能堵一条。
4. 永远先堵对手的三连。进攻之前，先确认对方下一步不会获胜。

掌握以上原则后，你在「困难」模式下至少能稳稳逼平——这正是井字棋作为博弈论入门范例的迷人之处。

关于这款游戏

这是昼夜工坊原创的 井字棋网页版，内置由极小化极大算法驱动的智能对手。免费、无需下载、手机电脑通用，三十秒一局，是练习逻辑与预判的绝佳小游戏。

常见问题

How to play Tic-Tac-Toe

Tic-Tac-Toe is one of the most familiar strategy games in the world. On a 3×3 grid, two players take turns — you play X, the computer plays O. The first to line up three marks in a row — horizontally, vertically or diagonally — wins. If all nine squares fill with no line, it's a draw.

There are two opponents: Easy (the computer plays semi-randomly) and Hard (it uses the minimax algorithm and never makes a mistake — the best you can do is force a draw).

Controls

• Click any empty square to place your X; the computer replies instantly.
• Switch opponent strength with the Easy / Hard toggle.
• Hit New round after each game; your win / draw / loss record is saved locally.

Winning (or never-losing) strategy

1. Take the centre. It sits on four winning lines — the strongest opening.
2. Grab corners over edges. A corner belongs to three lines, an edge to only two.
3. Create a "double threat". Two near-complete lines at once means your opponent can only block one.
4. Always block first. Before attacking, make sure the opponent can't win next move.

About this game

This is an original Tic-Tac-Toe by Day & Night Studio with a minimax-powered opponent. It's free, no download, phone and desktop. Why can't you beat "Hard"? Read Tic-Tac-Toe: A Game Humanity Completely Solved.

FAQ