**雪崩定式**是一类围棋定式的统称，因其状如雪崩而得名。有**小雪崩定式**和**大雪崩定式**两种。

小雪崩定式
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**小雪崩定式**变化较为单一。

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大雪崩定式
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**大雪崩定式**变化极为复杂，和妖刀定式、大斜定式并称为三大难解定式。

### 吳清源第一次下出內拐

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小目黑1一间高挂，白2托，黑3顶，白4挡，黑5扳。如果白不想走大雪崩，第8手可以走e。本图以下的变化，a为吃角，b为外拐，c为内拐。另外近年还有d位断的新型。

c 位「內拐」是吳清源所創的被稱為「革命定式」的一手，它是1957年2月20日，於第一屆日本最強者決定戰本賽對陣高川格的時候下出的。它使大雪崩定式完全改觀，以往都是在 b 位外拐。

### 內拐後實戰

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吳清源第一次內拐黑1時，白2是公認的疑問手，應該直接在白4位斷。

實戰時，黑21獲取實利，捨棄右邊三黑子。白22攔之後，黑23外碰暫時脫離戰場，意在解消左上邊白棋模样。

AlphaGo 對大雪崩定式的分析
-----------------

### 傳統的大雪崩定式是吃虧的

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根據黃士傑博士2017年8月2日的臉書資料，AlphaGo 認為傳統的大雪崩定式，黑棋是吃虧的，建議黑7不要跟著黑1長，改叫吃、白8黏、黑9大飛。

### AlphaGo 的分析

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黃士傑博士試著強迫 AlphaGo 走大雪崩定式，結果有別於傳統定式的2路拐，AlphaGo 認為在1位單長就可以了。
白6黏之後，黑7有A、B兩個下法，可以將局面的不利減到最小。

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緊接著黑7在(a位)右邊長，可以將局面的不利減到最小。

  


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白6黏之後，如果黑7下在三路星下(b位)，則白8長、黑9拐、白10跳，也可以將局面的不利減到最小。

### 內拐后一般变化

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值得注意的是，AlphaGo認為一般情況下白棋內拐比外拐更好，而2017年年初AlphaGo與羋昱廷九段所下出的外拐，是針對當時局面的場合下法。

Master大雪崩定式的網路實戰
----------------

AlphaGo在網路上60局，在此以第29局介紹大雪崩定式！

第29局：羋昱廷九段(黑)與Master(白)

### 羋昱廷(黑)與Master(白)實戰

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A位是大雪崩定式的一般下法，但是Master在白46弈出了新手。

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黑55是問題手，羋昱廷局後分析說：『因為是30秒的快棋，沒時間仔細思考，注意力都集中在了是否是先手上，結果出現了初級錯誤。』

然後Master在白56粘長取得先手，黑57跳，白58還搶到了棋盤上最後一個大場。

黑61拆，羋昱廷懊惱地認為：『這是第三步問題手，應該在B尖衝白棋，擴張中腹。』

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如果按照人類的定式來下，從白46長，一直下到黑57飛！

参考资料
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1. 廖渝生.. 四川科学技术出版社. ISBN 9787536458857 （中文（简体））.