⚫ 围棋Go (Weiqi)
在线围棋人机对战：9×9、13×13、19×19 三种棋盘，提子、禁入点、打劫规则，双方停一手后按中国规则数子（贴 7.5 目）并自动判断死子；蒙特卡洛电脑三档难度，可执黑、执白或双人对战，支持悔棋、停一手与认输。Play Go online against the computer on 9×9, 13×13 or 19×19: captures, no suicide, ko, and Chinese area scoring with 7.5 komi after two passes, with automatic dead-stone detection. Three Monte-Carlo levels, play black, white or two players, with undo, pass and resign.
点击交叉点落子（手机上先点一下预览，再点一次确认）。双方连续停一手后自动数子，半透明的棋子是判定的死子，小方块表示归属。键盘：方向键移动，回车 落子，P 停一手，U 悔棋。Click an intersection to play (on phones tap once to preview, again to confirm). Two passes in a row end the game and count the board — faded stones are judged dead and small squares show territory. Keyboard: arrows, Enter plays, P passes, U undo.
玩法说明与常见问题How to play & FAQ
「围棋」怎么玩？How do I play Go (Weiqi)?
黑白双方轮流在交叉点上落子，黑棋先行。一块棋相邻的空点叫“气”，气被对方全部堵住就会被提掉。不能下在自己没气又提不了对方的位置（禁入点）；刚被提掉一子的位置，对方不能立刻提回（打劫要先在别处走一步）。双方都认为没有好棋可下时各停一手，按中国规则数子：活棋子数加围住的空点，黑棋要多出贴目 7.5 才算赢。Black and White take turns placing stones on the intersections, Black first. The empty points next to a group are its liberties; a group with none left is captured. You may not play where your stone would have no liberties unless it captures, and you may not immediately retake a single stone in a ko. When neither side has a useful move, both pass and the board is counted Chinese-style: living stones plus surrounded points, with White receiving 7.5 points of komi.
新手建议用多大的棋盘？Which board size should beginners use?
建议先下 9×9：一局 10 分钟左右，电脑也最强、最能教你死活。熟悉后再尝试 13×13 和 19×19。Start with 9×9 — games take about ten minutes and the computer plays its best there. Move on to 13×13 and 19×19 once you are comfortable.
死子是怎么判断的？How are dead stones decided?
停一手结束后，程序会在后台模拟数百局把棋下完，统计每块棋最后归谁所有，归属对方的那块棋就判为死子（显示为半透明）。如果判断有争议，可以撤销后继续下，把死子提干净再停一手。After both pass, the game simulates hundreds of finished playouts and marks groups that usually end up owned by the opponent as dead (shown faded). If you disagree, undo and keep playing to capture them before passing.
电脑在 19×19 上有多强？How strong is the computer on 19×19?
电脑使用蒙特卡洛树搜索（UCT + RAVE），在 9×9 上对新手和业余低段有一定挑战；19×19 计算量大很多，棋力明显较弱，更适合练习布局和熟悉规则。It uses Monte-Carlo tree search (UCT + RAVE). On 9×9 it gives beginners and casual players a real game; 19×19 is much larger, so it is noticeably weaker there — good for practising openings and the rules.
「围棋」免费吗？需要下载吗？Is Go (Weiqi) 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.