Line-Board Shuang Cheng · 线板双城棋
Two shared pieces instead of one, and nothing stops you using them twice in a row. Take the middle and keep hold of it.
公用子有两枚，而且没有规矩拦着你连着用两回——抢到中间，就把它攥住。
三子围堵，两枚双城任选一枚
Three pieces each, plus two shared pieces either side can move
玩法要点
- 棋子：双方各 3 枚，另有 2 枚公用
- 棋盘：9 点，上下枢纽夹两枚双城
- 获胜：让对手无棋可走
Quick start
- A player who has no legal move at all — not even either shared piece — loses right away.
- Take turns moving one of your own pieces, or either shared piece, one step along a line to an adjacent empty point. No jumping, no capturing.
- The same player can move a shared piece on consecutive turns of their own. But once either shared piece was just moved, the other player cannot move any shared piece on their very next turn — it becomes movable again once that player has taken one turn with a different piece.
快速上手
- 轮到某一方却无棋可走——两枚双城也都动不了——就算输了。
- 双方轮流选一枚自己的棋子，或者选任意一枚“双城”，沿连线走一步到相邻的空棋点。不能跳跃，也不能吃子。
- 同一方可以连续动双城（这回合动了双城，下回合还能再动双城）；但只要刚才走的是任意一枚双城，对方下一回合不能紧接着也动双城，要等对方走完一步别的棋子之后，双城才能再被对方动。
Rules
Board and Setup
The board has 9 points: two top corners meet at a top hub, two bottom corners meet at a bottom hub, a shared piece sits on the left and another on the right, and the exact center is one more empty point — the real crossing of the hub-to-hub line and the shared-to-shared line, empty at the start.
One player's 3 pieces start on the top two corners and the top hub, the other player's 3 pieces start on the bottom two corners and the bottom hub. Either player can move either of the two shared pieces.
Movement and the Two Shared Pieces
Take turns moving one of your own pieces, or either shared piece, one step along a line to an adjacent empty point. No jumping, no capturing.
The same player can move a shared piece on consecutive turns of their own. But once either shared piece was just moved, the other player cannot move any shared piece on their very next turn — it becomes movable again once that player has taken one turn with a different piece.
Winning
A player who has no legal move at all — not even either shared piece — loses right away.
The core idea is to use the openings created by the two shared pieces to trap the other side's pieces with nowhere left to step.
Timer
Each turn lasts 60 seconds. When time runs out, the turn passes to the other side automatically.
You can change the difficulty anytime in Game Settings.
规则详解
棋盘与开局
棋盘有 9 个棋点：上方两个角连着一个上枢纽，下方两个角连着一个下枢纽，左右各放一枚公用的“双城”棋子，正中心还有一个空棋点——它是上下枢纽连线和两枚双城连线交叉出来的真实棋点，开局是空的。
一名玩家的 3 枚棋子摆在上方两角和上枢纽，另一名玩家的 3 枚棋子摆在下方两角和下枢纽。左右两枚公用的“双城”棋子谁都能用。
行棋与两枚双城
双方轮流选一枚自己的棋子，或者选任意一枚“双城”，沿连线走一步到相邻的空棋点。不能跳跃，也不能吃子。
同一方可以连续动双城（这回合动了双城，下回合还能再动双城）；但只要刚才走的是任意一枚双城，对方下一回合不能紧接着也动双城，要等对方走完一步别的棋子之后，双城才能再被对方动。
谁赢
轮到某一方却无棋可走——两枚双城也都动不了——就算输了。
围堵的思路：借两枚双城调度出的空当，把对方的棋子逼到没有空位可走。
计时
每步限时 60 秒，时间到了会自动换对方走。
可以在"对局设置"里换一个难度，随时都能换。