⚪ 五子棋Gomoku
在线五子棋人机对战：15×15 棋盘，简单/中等/困难三档电脑，可选先后手、悔棋，连成五子即胜，电脑在后台计算不卡顿，手机电脑都能下。Play Gomoku (five in a row) against the computer on a 15×15 board: three difficulty levels, play first or second, undo moves — the AI thinks in the background so the page never freezes.
点击棋盘交叉点落子（手机上先点一下预览，再点一次确认）。键盘：方向键移动光标，回车 落子，U 悔棋。Click an intersection to place a stone (on phones tap once to preview, again to confirm). Keyboard: arrows move the cursor, Enter places, U undoes.
玩法说明与常见问题How to play & FAQ
「五子棋」怎么玩？How do I play Gomoku?
黑白双方轮流在棋盘交叉点上落子，黑棋先行。谁先在横、竖或斜方向上连成五个（或更多）同色棋子就获胜；棋盘下满仍无人连五则为平局。Black and white take turns placing stones on the intersections, black first. The first to get five (or more) in a row horizontally, vertically or diagonally wins; a full board with no five is a draw.
电脑有多强？How strong is the computer?
简单难度会犯错，适合入门；中等会认真攻防；困难会在后台搜索多步棋（每步约 1–1.5 秒），能抓住大多数冲四和活三。Easy makes mistakes; Normal attacks and defends sensibly; Hard searches several moves ahead in the background (about 1–1.5 s per move) and spots most fours and open threes.
有禁手规则吗？Are there forbidden moves (renju rules)?
没有，这里使用无禁手的自由规则：连五或长连都算赢。No — this is freestyle gomoku with no forbidden moves; five or more in a row wins.
可以悔棋吗？Can I undo?
可以，「↶ 悔棋」会撤回你和电脑各一步，次数不限。Yes. Undo takes back your move and the computer’s reply, as many times as you like.
「五子棋」免费吗？需要下载吗？Is Gomoku free? Do I need to download anything?
完全免费，无需注册、下载或安装，打开网页就能玩，手机、平板和电脑都支持；游戏完全在你的浏览器本地运行，不会上传任何数据。It is completely free with no sign-up, download or install — just open the page on a phone, tablet or computer. The game runs entirely in your browser and nothing is uploaded.