Jiugong Shuang Cheng Chess · 九宫双承棋
A plain 3×3 grid with one piece you both own, and an opening rule that forbids touching it on the very first move.
一张干净的九宫格、一枚共用子，外加一条开局规矩：第一手不许碰它。
九宫格棋盘，第一步不能走公用棋子
A 3x3 grid where turn 1 can't touch the shared piece
玩法要点
- 棋子：双方各 3 枚，另有 1 枚公用
- 棋盘：9 点，三行三列
- 获胜：让对手无棋可走
Quick start
- A player who has no legal move at all — not even the shared piece — loses right away.
- Step horizontally or vertically with an own or shared piece, without capture or jumping; the opening move cannot use the shared piece.
- After a shared-piece move, the rival must move another piece before using the shared piece again.
快速上手
- 轮到某一方却无棋可走——连公用棋子也没法动——就算输了。
- 己子或公用子横竖走一格，不吃不跳；开局第一步不能走公用子。
- 刚动过公用子，下一回合对方必须先走别的棋，不能马上再动它。
Rules
Board and Setup
The board is a 3-by-3 grid; every point connects to its horizontal and vertical neighbors.
One player's 3 pieces start on the top row, the other player's 3 pieces start on the bottom row. The right point of the middle row holds one more piece — shared by both players. The other two middle points start empty.
Movement and the Shared Piece
Take turns moving one of your own pieces, or the shared piece, one step along a line to an adjacent empty point. No diagonals, no jumping, no capturing.
The very first move of the game cannot be the shared piece — as soon as either side makes one ordinary move, it becomes available; you don't have to wait for both sides to move.
If the shared piece was just moved, the other player cannot move it 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 the shared piece — loses right away.
The core idea is to use the shared piece together with your own pieces to trap the other side's pieces in a corner.
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
棋盘是一个三行三列的九宫格，横竖相邻的点都连着线。
一名玩家的 3 枚棋子摆在最上面一行，另一名玩家的 3 枚棋子摆在最下面一行。中间一行右边那个点放一枚谁都能用的公用棋子，中间一行其余两点空着。
行棋与公用棋子
双方轮流选一枚自己的棋子，或者选公用棋子，沿横竖方向走一步到相邻的空点。不能斜走，不能跳跃，也不能吃子。
第一步不能选公用棋子，只要有一方先走完一步普通棋子，接下来就能有人去动它，不用等双方都走过。
如果刚才走的是公用棋子，下一回合对方不能马上再走它，要等对方走完一步别的棋子之后，公用棋子才能再被动。
谁赢
轮到某一方却无棋可走——连公用棋子也没法动——就算输了。
围堵的思路：用公用棋子和自己的棋子一起把对方的棋子堵在角落里。
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。