Backgammon
Backgammon is one of the oldest two-player board games: a race around 24 points, driven by the roll of two dice. On KachaPlay (kachaplay.com) you play it free in your browser, against the computer, a random opponent, or a friend. This page covers the rules we use, the ways to play, and a few pointers.
The rules we use
- Each side has 15 checkers set out in the standard opening position.
- On your turn you roll two dice and move checkers by that many pips toward your home. Doubles let you play the number four times.
- A single checker on a point is a blot. Land on an opponent's blot and you hit it — it goes to the bar and must re-enter on the far side before that player can move anything else.
- Once all 15 of your checkers are in your home board, you start bearing off — removing them by exact or higher rolls.
- The first player to bear off all 15 checkers wins. There are no draws.
The dice are drawn by the server, not the browser, so neither side can influence a roll. Two trims keep the game clean and fast: the doubling cube and gammon/backgammon point multipliers are not used here — rating is based purely on who wins.
Ways to play on KachaPlay
Against the computer
Three difficulty levels — Rookie, Sensei and Master. Computer games are for practice: no rating change, no coins or gems.
Online against a random opponent
Get matched with another player. These games are rated — backgammon keeps its own Elo rating, and online games are where coins and gems come from.
Against a friend
Create a room and share the link, or invite a friend. Friend rooms are casual (no rating). Each online game can be no time limit, 5 minutes or 10 minutes per side. See How to Play for the full rating and currency rules.
A few tips
- Cover your blots — a lone checker can be hit and sent all the way back to the bar.
- Making points in front of your opponent's checkers slows their escape.
- When you are ahead in the race, run; when behind, hold back and wait for a hit.
- Try to keep your home board strong so a checker you hit is hard to re-enter.
FAQ
Is there a doubling cube?
No — the doubling cube is out of scope here, so games are a straight race to bear off.
Are the dice fair?
Yes. The server draws every roll with an authoritative random source; the browser cannot tamper with it.
Can a backgammon game end in a draw?
No. Someone always bears off all fifteen checkers first.
双陆棋（中文）
双陆棋是最古老的双人棋之一：在 24 个点位上比赛谁先跑完，由两颗骰子推动。在 KachaPlay （kachaplay.com）打开浏览器即可免费对战：可选电脑、随机对手或好友。 本节说明我们采用的规则、对战方式与几点建议。
我们采用的规则
- 每方 15 枚棋子，采用标准开局摆法。
- 轮到你时掷两颗骰子，按点数把棋子朝自己的内盘方向移动；掷出对子可走四步。
- 点位上只有一枚棋子叫“单张”（blot）。落到对方单张上即击中，把它送上 吧台（bar）；该子必须先从对面重新进场，对方才能动其他子。
- 当你的 15 枚棋子全部进入内盘后，即可归家（bear off）——按点数把棋子移出棋盘。
- 先把 15 枚全部归家的一方获胜。无和棋。
骰子由服务端掷出而非浏览器,双方都无法影响点数。为保持简洁明快,这里不使用加倍骰(doubling cube), 也不计 gammon/backgammon 的翻倍——积分只看谁赢。
在 KachaPlay 的对战方式
人机对战：三个难度（Rookie / Sensei / Master），仅供练习，不计积分、无奖励。
在线随机对战：与他人配对，计积分——双陆棋有独立 Elo 积分，金币钻石来自在线对局。
好友对战：建房分享链接或邀请好友；好友房为休闲局，不计积分。每局在线对战可选不限时、 每方 5 或 10 分钟。全站积分与货币规则见 玩法说明。
几点建议
- 尽量不要留单张——落单的棋子会被击中、送回吧台从头再来。
- 在对方棋子前方连续占点，能拖慢它们的逃跑。
- 比赛领先时就往前冲；落后时按兵不动，等待击中机会。
- 让自己的内盘尽量坚固，被你击中的子就更难重新进场。
常见问题
有加倍骰吗？没有——这里不使用加倍骰，对局就是一场归家竞速。
骰子公平吗？公平。每次点数都由服务端用权威随机源掷出，浏览器无法作弊。
双陆棋会平局吗？不会，总有一方先把 15 枚棋子全部归家。