越救越死 — 接上棋子反而全部被吃
一只老鼠 🐭 被黑猫堵住了，快跑不掉了。它大喊："救命！"另一只老鼠 🐭 赶来帮忙，和它连在一起。但连在一起后，两只老鼠变成了一大团，反而更跑不动了——黑猫 🐱 一网打尽！
接不归（日语：追い落とし，Oiotoshi）是围棋中一种令人惊叹的战术。它的名字直接说明了这种战术的本质——"接上了，但回不来了"。意思是：被叫吃的棋子即使连接上了自己的大部队，整个棋块也无法逃脱被吃的命运。
接不归的核心原理是"气紧"（shortage of liberties）。当被切断的棋子连接回来时，虽然看起来棋块变大了，但由于整个棋块的气数不够，反而比不连接时更容易被吃掉。这就像溺水的人抓住了旁边的人，结果两个人一起沉下去了。
接不归是中高级棋手需要掌握的重要战术。它经常出现在中盘的激烈战斗中，特别是在切断和分断的局面里。能够识别接不归的形状，可以帮助你避免陷入这种致命的陷阱，也可以帮助你对对手设下这样的陷阱。
要理解接不归，关键是理解"气紧"的概念。在围棋中，当两组棋子连接在一起时，新棋块的气数等于两组棋原有的外气之和减去连接点消耗的气。
关键的数学关系：
接不归发生的条件是：连接后整个棋块的气数少于对方攻击棋块的气数。即使棋子多了，如果气数不够，照样会被吃掉。
让我们看一个接不归的基本例子：
白棋在绿色标记处连接，但连接后整个棋块气不够，仍会被黑棋吃掉
在这个例子中，上方三颗白棋被叫吃，下方有一颗孤立的白棋。白棋如果在绿色标记处连接，四颗白棋会变成一个整体。但是，连接后的白棋整块只有1-2口气，而黑棋的包围已经非常紧密。黑棋继续紧气就能吃掉全部四颗白棋。白棋"接了"，但"回不来了"。
初学者可能会困惑：连接不是增加了棋子数量吗？为什么反而更容易被吃？原因在于：
连接点本身要用掉气。原来两组棋各有独立的气，连接后连接处的气被消耗，总气数可能反而减少。
如果不连接，对方只能吃掉被切断的小块。连接后，如果整块都逃不掉，对方吃掉的就是一大块——损失更大。
连接后形成的大块如果气紧，对方紧气的效率更高，因为一步棋就能同时威胁整个大块。
接不归在棋盘边缘更容易发生，因为边上的棋子本身气就少，连接后更容易出现气不够的情况。
边上的接不归：白棋在绿色处连接后，整块气不够
白棋在边上有两颗子被黑棋围攻，旁边有一颗独立的白棋。如果在绿色处连接，三颗白棋合为一体，但由于靠近边缘气数有限，连接后仍然逃不掉。这是边上接不归的典型形状。
在实战中识别接不归需要以下技巧：
当考虑是否连接时，先数：连接后整块有几口气？对方紧气需要几步？如果你的气数少于对方紧气的步数，就是接不归。
接不归的典型特征是：被切断的两部分棋子各自气紧，而连接点附近被对方棋子密密包围。
当对方执意切断你的棋子时，要想一想：对方是否已经算到接不归？如果是，那就不要上当——放弃被切断的小块，保住大块。
在进攻时，当你切断对方的棋子后，检查对方是否存在接不归。如果存在，你可以放心地继续攻击，不用担心对方连接。
了解接不归后，你可以采取以下措施来避免陷入这种困境：
接不归不是孤立的战术，它和其他战术密切相关：
One mouse 🐭 is trapped by the cat and about to be caught. It shouts "Help!" Another mouse 🐭 runs over and connects with it. But now they're one big group — even harder to run! The cat 🐱 catches them both at once!
Connect and Die (Japanese: Oiotoshi) is a stunning tactic in Go. Its name directly describes the essence of this technique — the stones "connect" but cannot "come back alive." It means that even if the cut stones successfully reconnect with the main group, the entire block still cannot escape being captured.
The core principle behind Connect and Die is the "shortage of liberties." When cut-off stones reconnect to the main group, the combined block appears larger, but because the total number of liberties is insufficient, it actually becomes easier to capture than if the stones had remained separated. It is like a drowning person grabbing someone nearby — both end up sinking together.
Connect and Die is an important tactic for intermediate to advanced players. It frequently appears during intense middle-game fighting, especially in cutting and separation situations. Being able to recognize Connect and Die patterns helps you avoid falling into this fatal trap, and also helps you set such traps for your opponent.
To understand Connect and Die, the key is understanding the concept of "shortage of liberties." In Go, when two groups of stones connect, the new group's liberties equal the sum of both groups' external liberties minus the liberties consumed at the connection point.
The critical mathematical relationship:
Connect and Die occurs when the combined group's liberties are fewer than the opponent's attacking group's liberties. Even with more stones, if you don't have enough liberties, you will still be captured.
Let's look at a basic example of Connect and Die:
White connects at the green marker, but the combined group still doesn't have enough liberties and will be captured by Black
In this example, three white stones at the top are in atari, and there is an isolated white stone below. If White connects at the green-marked position, all four white stones become one group. However, the combined group has only 1-2 liberties, while Black's surrounding is already very tight. Black continues to reduce liberties and captures all four white stones. White "connected" but "couldn't come back."
Beginners may be confused: doesn't connecting increase the number of stones? Why does it make things easier to capture? The reasons are:
The connection point itself uses up liberties. Originally, the two groups each had independent liberties. After connecting, the liberties at the connection point are consumed, and the total liberty count may actually decrease.
Without connecting, the opponent can only capture the small cut-off group. After connecting, if the whole block cannot escape, the opponent captures a much larger group — the loss is far greater.
The large combined block, if short of liberties, is more efficiently attacked. A single opponent move can threaten the entire large block simultaneously.
Connect and Die occurs more easily near the board edges because edge stones inherently have fewer liberties, making it more likely that the combined group will be short of liberties after connecting.
Edge Connect and Die: White connecting at the green marker still results in insufficient liberties
White has two stones under attack at the edge, with an isolated white stone nearby. If White connects at the green position, the three white stones merge, but due to limited liberties near the edge, the connected group still cannot escape. This is a typical edge Connect and Die shape.
Recognizing Connect and Die in real games requires the following skills:
When considering whether to connect, first count: how many liberties will the combined group have? How many moves does the opponent need to reduce those liberties to zero? If your liberties are fewer than the opponent's moves needed, it's Connect and Die.
Typical Connect and Die features include: both parts of the cut stones are short of liberties, and the connection area is densely surrounded by opponent stones.
When the opponent insists on cutting your stones, ask yourself: has the opponent already calculated a Connect and Die? If so, don't fall for it — abandon the small cut-off group and keep the large group safe.
When attacking, after you cut the opponent's stones, check whether a Connect and Die exists. If it does, you can confidently continue your attack without worrying about the opponent reconnecting.
After understanding Connect and Die, you can take the following measures to avoid falling into this trap:
Connect and Die is not an isolated tactic — it is closely related to other techniques: