Qwen3.5 9B on Cozy grid 1

5 given 5 filled correctly 53 wrong, with the right digit 3 left empty

The end of its reply

<grid>
589172364
163485972
742698513
85471926? -> Wait, let me re-verify the full solution logic to ensure accuracy before output.
Let's re-run a strict logical deduction or solve step-by-step carefully.

**Initial Grid:**
Row 0: 5 . . | . . . | . . .
Row 1: . . 3 | . . 8 | . . 2 -> Wait, the input string format `..8 ..2` implies spaces.
Input: `5.. ... ...` (Row 0)
`..3 ..8 ..2` (Row 1) -> C2=3, C5=8, C8=2? Or is it `..3`, `..8`, `..2` meaning cols 2, 5, 8?
Let's assume standard spacing: 3 chars per block.
R0: 5 . . | . . . | . . . -> [5][ ][ ] | [ ][ ][ ] | [ ][ ][ ]
R1: . . 3 | . . 8 | . . 2 -> [ ][ ][3] | [ ][ ][8] | [ ][ ][2] ? No, the string is `..3 ..8 ..2`. That's 9 chars if spaces are ignored?
Ah, the prompt says "Puzzle (31 givens...)".
Let's parse the string `5..........3..8..2.8..6974..5.49..1.12.....96.49.76..8.6295..3.9..8..2..........1` carefully.
It seems there are no spaces in the "one line" version, but the "Puzzle" block has spaces.
Let's assume the visual block:
`5.. ... ...` -> R0C0=5. Rest empty.
`..3 ..8 ..2` -> R1C2=3, R1C5=8, R1C8=2. (Indices 2, 5, 8).
`.8. .69 74.` -> R2C1=8, R2C4=6, R2C5=9, R2C6=7, R2C7=4.
`.5. 49. .1.` -> R3C1=5, R3C3=4, R3C4=9, R3C7=1.
`12. ... .96` -> R4C0=1, R4C1=2, R4C7=9, R4C8=6.
`.49 .76 ..8` -> R5C1=4, R5C2=9, R5C4=7, R5C5=6, R5C8=8.
`.62 95. .3.` -> R6C1=6, R6C2=2, R6C3=9, R6C4=5, R6C7=3.
`9.. 8.. 2..` -> R7C0=9, R7C3=8, R7C6=2.
`... ... ..1` -> R8C8=1.

Let's populate the grid mentally and solve.

**Grid State:**
R0: 5 . . | . . . | . . .
R1: . . 3 | . . 8 | . . 2
R2: . 8 . | . 6 9 | 7 4 .
R3: . 5 . | 4 9 . | . 1 .
R4: 1 2 . | . . . | . 9 6
R5: . 4 9 | . 7 6 | . . 8
R6: . 6 2 | 9 5 . | . 3 .
R7: 9 . . | 8 . . | 2 . .
R8: . . . | . . . | . . 1

**Box 0 (Top Left):**
Cells: (0,0)=5. (1,2)=3 is outside. (2,1)=8.
Values in Box 0:
R0: 5, ?, ?
R1: ?, ?, 3 (Wait, 3 is at C2, which is Box 1? No. Box 0 is Cols 0-2. So R1C2=3 IS in Box 0).
R2: ?, 8, ?
So Box 0 has {5, 3, 8}. Missing: 1, 2, 4, 6, 7, 9.
Cols 0, 1, 2. Rows 0, 1, 2.
R0C0=5.
R1C2=3.
R2C1=8.
Constraints:
Col 0 has R4C0=1, R7C0=9. So Box0 Col0 cannot be 1, 9.
Col 1 has R3C1=5, R4C1=2, R5C1=4, R6C1=6.
Box 0 Col 1 cells: R0C1, R1C1, R2C1(8).
Values present in Col 1: 5, 2, 4, 6, 8 (from R2).
Missing in Col 1: 1, 3, 7, 9.
R0C1, R1C1 need to be from {1, 3, 7, 9}. But 3 is in Box 0 at R1C2. So R1C1 != 3.
R0C1 can be 1, 7, 9? R4C0=1 implies no 1 in Col 0.
Let's look at **Row 4**: `1 2 . | . . . | . 9 6`. Missing: 3, 4, 5, 7, 8.
**Box 4 (Center):** Rows 3-5, Cols 3-5.
R3C3=4, R3C4=9.
R4: empty, empty, empty.
R5C4=7, R5C5=6.
Values in Box 4 so far: {4, 9, 7, 6}. Missing: 1, 2, 3, 5, 8.
Col 4 has: R2C4=6, R3C4=9, R

Grid cozy-0 of set v1, 31 givens. Puzzle as one line: 5..........3..8..2.8..6974..5.49..1.12.....96.49.76..8.6295..3.9..8..2..........1