🁢 骨牌占位棋Domineering
在线骨牌占位棋：一方只能竖着放骨牌，另一方只能横着放，每块骨牌占两个相邻空格，轮到谁却放不下自己方向的骨牌谁就输。规则只有一句，却是组合博弈论里的经典游戏，越到后面越要算清每一块空地还能放几块。可选 5×5 到 8×8 棋盘，人机三档难度、双人对战和悔棋。Domineering online: one player may only place dominoes vertically, the other only horizontally; each domino covers two adjacent empty squares, and whoever cannot place a domino on their turn loses. One rule, yet a classic of combinatorial game theory — late in the game you need to count exactly how many dominoes each empty patch still holds. Boards from 5×5 to 8×8, three computer levels, two-player mode and undo.
点一个空格放下骨牌（竖放向下、横放向右占一格；放不下时会自动向上/向左）；鼠标移上去能看到预览。Tap an empty square to place your domino (down for vertical, right for horizontal, or up/left if needed); hover to preview.
玩法说明与常见问题How to play & FAQ
「骨牌占位棋」怎么玩？How do I play Domineering?
竖放方（蓝）先走，每次放一块竖着的骨牌，盖住上下相邻的两个空格；横放方（橙）每次放一块横着的骨牌，盖住左右相邻的两个空格。骨牌不能重叠，也不能出界。轮到某一方时，如果棋盘上已经找不到两个相邻的空格可以按自己的方向放，这一方就输了。Vertical (blue) moves first and places a vertical domino covering two empty squares one above the other; Horizontal (orange) places horizontal dominoes covering two side-by-side squares. Dominoes may not overlap or stick out of the board. If on your turn there is no pair of empty squares in your direction, you lose.
有什么常用技巧？Any basic strategy?
尽量给自己“留地”：比如在边上留出只有你能放的狭长空位，对方用不上，最后就成了你的储备步数；同时用骨牌把对方能用的空间切碎。Keep spare room for yourself — narrow strips only your direction can use are moves in reserve — while cutting the space your opponent needs into useless pieces.
电脑是怎么下的？How does the computer play?
它比较双方剩余可放位置的多少来评估局面，困难档在空地变少时会算得更深，残局几乎不出错。It scores positions by comparing how many placements each side has left; on Hard it searches much deeper as the board fills, so endgames are nearly perfect.
「骨牌占位棋」免费吗？需要下载吗？Is Domineering 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.