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README.md

@@ -80,6 +80,64 @@ The standard setup used in d1/d2/SPG:
 - **Prompt format**: System prompt with CoT reasoning (`<reasoning>...</reasoning><answer>...</answer>`)
 - **Evaluation metric**: Cell-level accuracy (fraction of correctly filled empty cells)
 
+### Model Input Prompt Example
+
+The following is the actual prompt format used in d1/d2/SPG for training and evaluation:
+
+```
+[System]
+Please solve the following 4x4 Sudoku puzzle. The puzzle is provided as a 16-character
+string reading left-to-right, top-to-bottom, where '0' represents empty cells.
+
+Rules:
+- Fill empty cells with digits 1-4
+- Each row must contain digits 1-4 exactly once
+- Each column must contain digits 1-4 exactly once
+- Each 2x2 box must contain digits 1-4 exactly once
+
+Important: Your solution must be a COMPLETE 16-character string with only the digits 1-4,
+representing your final solved grid.
+
+Respond in this exact format:
+<reasoning>
+Your step-by-step solving process
+</reasoning>
+<answer>
+[16-character solution string with no spaces or separators]
+</answer>
+
+[User]
+Solve the following Sudoku puzzle: 0321003004002100
+```
+
+**Expected model output (example - actual CoT content varies by model):**
+
+```
+<reasoning>
+The puzzle grid is:
+0 3 | 2 1
+0 0 | 3 0
+----+----
+0 4 | 0 0
+2 1 | 0 0
+
+Row 1: has 3,2,1 → missing 4 → position 0 = 4
+Row 2: has 3 → need 1,2,4
+  Col 0: has 2 → need 1 or 4; Box0: has 3 → R1C0=4, so need 1 → position 4 = 1
+  Col 1: has 3,4,1 → need 2 → position 5 = 2
+  Col 3: has 1 → need 2,3,4; Row2 needs 4 → position 7 = 4
+Row 3: has 4 → need 1,2,3
+  Col 2: has 2,3 → need 1 or 4; Row3 needs 1,2,3 → position 10 = 1
+  Col 3: has 1,4 → need 2 or 3; Box3: has 1 → position 11 = 2
+Row 4: has 2,1 → need 3,4
+  Col 2: has 2,3,1 → need 4 → position 14 = 4
+  Col 3: has 1,4,2 → need 3 → position 15 = 3
+</reasoning>
+<answer>
+4321123434122143
+</answer>
+```
+
 ### Benchmark Results
 
 | Method | Sudoku Accuracy | Paper |