**大斜定式**| 

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| 大斜定式基本型。白4通常下在a位。 |

**大斜定式**是一個围棋定式，其变化复杂，有"大斜千变"之称。

歷史
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大斜出現在17世紀末的日本，最早出現在本因坊道知的對局，但尚未成為定式；幾十年後於相原可碩的對局棋譜中出現大斜定式。

在幾十年的時間內，儘管可能被小範圍地研究過，它卻並沒有流行起來。隨後在19世紀40年代，人們開始探索大斜定式，例如本因坊丈和、井上幻庵因碩等高手都曾下過複雜的大斜定式。

因其可能導致征子和劫爭，它成為了最複雜的定式，直到20世紀被大雪崩定式所取代。

黃士傑博士曾於2016年12月29日至2017年1月4日，匿名為 Master 在網路上用 AlphaGO 與職業棋士對局。實戰中，職業棋士用三間低夾，AlphaGO 此時遂以大斜定式回應，可見大斜定式還是有出現的價值。

後來，黃士傑博士以 AlphaGO 模擬大斜定式，根據 AlphaGo 的計算，並不建議人類直接去下大斜定式。

而對於實戰中，職業棋士在序盤時用三間低夾，AlphaGO 遂以大斜定式回應，黃士傑博士分析後面的棋局發展有六種狀況，算是解決了三百多年來大斜定式的疑問，黃士傑博士並將模擬結果公佈在2017年8月9日的臉書上。

现状
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因目外占角不常见，而且适用面较窄，所以大斜定式较少出现在当代的比赛中。

AlphaGo 大斜定式分析
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### AlphaGo 的建議1

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這是大斜定式的基本型，但是根據黃士傑博士在2017年8月9日的臉書資訊， AlphaGo 經過計算，認為白1大斜飛不如A位飛壓，看來AlphaGo並不建議人類直接去下大斜定式。

### AlphaGo 的建議2

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AlphaGo會建議先對付右上角星位的黑棋，白1下在三路的馬步，通常黑棋會來個黑2飛也下在3路，然後白3立即回來攻防右下角，不急著下出大斜定式。這是個很常見的序盤！

AlphaGo 的實戰分析
-------------

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黃士傑曾經匿名為 Master在網路上用AlphaGo與職業棋士對局。實戰中，白1之後，職業棋士用黑2三間低夾，AlphaGo才下在白3，走了大斜定式，可見大斜定式還是有出現的價值。

黑棋再來有A、B、C三種回應，其中A、B兩個比較簡單，C比較複雜且會引伸出四種狀況，所以共有六種發展。

### AlphaGo 的實戰A(勢均力敵)

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前圖中黑棋走A位，黑1下在左下角馬步，白2跳、黑3飛，然後白4尖。AlphaGo 認為雙方序盤平衡發展、勢均力敵。

### AlphaGo 的實戰B(白棋稍優)

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前圖中黑棋走B位時，黑棋選擇黑1尖頂，白2就擋，一直走到黑9跳、白10回補一手，AlphaGo計算後，認為白棋的局面稍佔優勢。

### AlphaGo 的實戰C

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前圖中黑棋走C位，黑1碰，再來白2有D、E有兩種應法，各自又產生兩種走法，一共四種。

### AlphaGo 的實戰 C-D

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前圖中黑棋走C位，黑1跳，去碰白棋，白2在D位擋、黑3長、白4也往角落裡長、黑5長引發戰鬥，白6碰，黑7則有F、G兩種下法。

### AlphaGo 的實戰 C-D-F(勢均力敵)

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黑7下在F位：黑7長、白8長、黑9長、白10衝斷，一直下到白18止，雙方各棄一子，白取得右上角落，黑棋在上邊也不錯！(AlphaGo 認為雙方勢均力敵)

### AlphaGo 的實戰 C-D-G(黑棋稍差)

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黑7下在G位：黑7擋、白8斷、黑9叫吃、白10長，黑13叫吃時，白14下在左下角、黑15提子，白16再補一手！(AlphaGo 認為黑棋稍差)

### AlphaGo 的實戰 C-E

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前圖中黑棋走C位，黑1碰，再來白2在E位應，在右邊斷、黑3叫吃、白4連、黑5連，一直下到黑9扳、黑11擋是手段，再來的白棋有H跟J兩種下法！

### AlphaGo 的實戰 C-E-H (勢均力敵)

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白棋下在H位：白12、白14限制了三個黑子往下的發展，黑15斷，一直下到白22提子，黑23攔。(AlphaGo 認為雙方勢均力敵)

### AlphaGo 的實戰 C-E-J (勢均力敵)

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白棋下在J位：當白12下在另一邊時，於是黑13飛、白14叫吃、黑15棄子、白16提子，黑17引出。 (AlphaGo 認為雙方勢均力敵)

Master大斜定式的網路實戰譜
----------------

AlphaGo在網路上下了60局，在此以二局介紹大斜定式！

第27局：Master(黑)vs范廷鈺(九段)

第28局：Master(黑)vs孟泰齡(六段)

### 第27局：Master(黑)vs范廷鈺(九段)

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白10夾，黑11選擇走大斜定式。

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白20跳、黑21夾白10，然後黑23、黑25入侵左上角的白地。

### 第28局：Master(黑)vs孟泰齡(六段)

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孟泰齡白20連爬，范廷鈺的白20則是跳出，但是執黑的 Master 兩盤都堅持走黑21夾白10，絲毫不擔心白棋在下方扳起。

然後黑23、黑25入侵左上角的白地。

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黑31拆二，上方黑棋形勢堅強。白32扳起。

### 大斜定式傳統下法

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白10夾、黑11大飛時，大斜定式傳統下法白12會走靠出，然後發展至白28。

至此黑棋取角地穩固，外圍也堅實，而且是先手，白棋劣勢。

外部链接
----

* Sensei's Library page on *taisha joseki*