逐步數獨解題器

貼上任意數獨，它會按人的思路來解——一次一個人類技巧，依序推進，並為每一步推理給出白話解釋。這是學習工具而非答案機器：你可以在任意一步停下，讀懂這一手為何是被迫的，然後回到自己的盤面。

輸入或貼上盤面的 81 格（空格用 0 或點），然後逐步推進。每一步都會highlight相關格子並標明所用技巧。若卡住，通常表示需要階梯之外的技巧，或你輸入的盤面沒有唯一解。

它沿著標準人類技巧的階梯推進，總是先嘗試能取得進展的最簡單技巧——與人手解題的順序一致。每個技巧都有獨立說明頁：

• · Naked Single — A Naked Single is a cell that has only one remaining candidate, so that value must go there.
• · Hidden Single — A Hidden Single is a digit that can legally go in only one cell within a row, column or box, even if that cell has other candidates.
• · Pointing (Locked Candidates) — Pointing is when all candidates for a digit inside a box fall on a single row or column, letting you eliminate that digit from the rest of that row or column.
• · Claiming (Locked Candidates) — Claiming is the mirror of pointing: when a digit's candidates in a row or column all fall inside one box, you eliminate that digit from the rest of that box.
• · Naked Pair — A Naked Pair is two cells in the same unit that share the same two candidates, letting you remove those two digits from every other cell in the unit.
• · Hidden Pair — A Hidden Pair is two digits that can only go in the same two cells of a unit, letting you strip all other candidates from those two cells.
• · X-Wing — An X-Wing is a rectangle pattern where a digit's candidates in two rows line up in the same two columns, allowing eliminations down those columns (or vice versa).
• · Swordfish — A Swordfish is the three-line generalization of the X-Wing: a digit confined to the same three columns across three rows, enabling column eliminations.
• · XY-Wing — An XY-Wing is a three-cell pattern (a pivot seeing two pincers) that forces a common digit out of any cell both pincers can see.
• · Forcing Chain — A Forcing Chain follows a sequence of 'if this, then that' implications until two starting assumptions converge on the same conclusion, which must therefore be true.

不會。解題器完全在你的瀏覽器中執行——你輸入的盤面不會被上傳、儲存或記錄。它也不與我們的題庫相連，只處理你貼上的內容。

也可以瀏覽我們的評級題庫，每道題都已標明所需技巧。