🚢 海战棋Sea Battle
在线海战棋（舰队对战）：在 10×10 海域摆放 5 艘舰船，轮流向对方海域开炮，先击沉对方全部舰船获胜；支持拖动摆船、点击旋转、随机摆放，电脑三档难度（困难用概率推算），记录最少炮弹数。Play sea battle online: place five ships on a 10×10 grid, take turns firing at the enemy waters and sink the whole enemy fleet first. Drag to place, click to rotate or randomise; three computer levels (Hard uses probability density) and a fewest-shots record.
摆船：拖动船只移动，点击船只旋转。开战后点击右侧格子开炮：圆点是落空，红叉是命中，船被击沉后周围一圈会自动标为海水。键盘：方向键移动瞄准框，回车 开炮，N 新游戏。Setup: drag ships to move them, click a ship to rotate it. Then click squares on the right to fire: dots are misses, red crosses hits, and the ring around a sunk ship is marked as water. Keyboard: arrows aim, Enter fires, N new game.
玩法说明与常见问题How to play & FAQ
「海战棋」怎么玩？How do I play Sea Battle?
双方各有 5 艘船：航母（5 格）、战列舰（4 格）、两艘巡洋舰（3 格）和驱逐舰（2 格），横放或竖放在自己的 10×10 海域里，船与船不能相邻（斜着也不行）。双方轮流向对方海域的一个格子开炮，对方告知“落空 / 命中 / 击沉”。先击沉对方全部船只的一方获胜。Each side has five ships — a carrier (5), a battleship (4), two cruisers (3) and a destroyer (2) — placed horizontally or vertically on its own 10×10 grid, never touching each other, not even diagonally. Players take turns firing at one square of the enemy grid and are told miss, hit or sunk. Sink the whole enemy fleet first to win.
为什么船不能挨着放？Why can’t ships touch?
这是常见的海战棋规则，好处是击沉一艘船后，它周围一圈一定是海水，会自动标出来，让推理更清晰。It is a common sea-battle rule: once a ship sinks, the ring of squares around it must be water and is marked automatically, which keeps the deduction clean.
电脑会作弊吗？Does the computer cheat?
不会，电脑看不到你的船。简单难度基本乱打；中等用棋盘格隔一打一并追击命中；困难会统计剩余船只所有可能的摆法，选概率最高的格子开炮，平均 40 发左右就能全歼。No — it never sees your ships. Easy fires almost at random; Normal hunts on a checkerboard and follows up hits; Hard counts every possible placement of the remaining ships and fires at the most likely square, finishing in about 40 shots on average.
有什么摆船技巧？Any placement tips?
别总把船放在边上或角落，也别排得太规整；分散、方向混合的布局更难被概率推算找到。Avoid always hugging the edges or corners, and avoid neat patterns; scattered ships in mixed orientations are hardest to find.
「海战棋」免费吗？需要下载吗？Is Sea Battle 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.