Qwen3.5 9B on Tricky grid 2

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

The end of its reply

.8....75.....97..3..256.......6.1...3..2....5..6.7..9....`

Parsing:
R1: `...........1` -> 8 dots, then 1. So R1C9=1. Grid: . . . . . . . . 1
R2: `3.527.4..` -> 3 . 5 | 2 7 . | 4 . .
R3: `...4..8.` -> Wait, let's look at the chars count.
The string is continuous. Let's break it into chunks of 9.
Chunk 1 (R1): `...........1` -> Length 10? No.
Let's recount the input string length.
`...........1` is 10 characters? `.`x8 + `1` = 9 chars. Ah, `.......` (7 dots) + `..1` (2 dots, 1)?
Input: `...........1`
Let's assume standard Sudoku spacing isn't in the single line string.
The prompt says: "Same puzzle as one line of 81 characters".
Let's count the dots in `...........1`.
If it is 81 chars total, each row is 9 chars.
Row 1: `...........1`? That looks like 10 chars. Maybe the first part is `.......` (7) then `. . 1`?
Let's look at the visual again: `... ... ..1`.
This implies Row 1 Col 1-3 are empty, Col 4-6 are empty, Col 7-8 empty, Col 9 is 1.
So R1: `.......` (7 dots) then `1`? No, `..1` means two dots then a 1.
So R1: `.` `.` `.` `.` `.` `.` `.` `.` `1`. That's 8 dots and a 1. Total 9 chars.
Okay, R1 = `.......` (7) + `.` (8) + `1` (9)? No.
Visual: `...` (3) `...` (6) `..1` (9).
So R1 = `. . . . . . . . 1`.

Row 2: `3.5 27. 4..`
Block 1: `3.5` -> `3`, `.`, `5`.
Block 2: `27.` -> `2`, `7`, `.`.
Block 3: `4..` -> `4`, `.`, `.`.
R2 = `3 . 5 2 7 . 4 . .`

Row 3: `... .4. .8.`
Block 1: `...` -> `. . .`
Block 2: `.4.` -> `.`, `4`, `.`
Block 3: `.8.` -> `.`, `8`, `.`
R3 = `. . . . 4 . . 8 .`

Row 4: `... 75. ...`
Block 1: `...` -> `. . .`
Block 2: `75.` -> `7`, `5`, `.`
Block 3: `...` -> `. . .` (Wait, the visual has `...` at the end? Or is it empty?)
Visual: `... 75. ...` -> Spaces separate blocks.
Block 1: `...`
Block 2: `75.`
Block 3: `...`? The text says `...` then space then `75.` then space then `...`.
So R4 = `. . . 7 5 . . . .`

Row 5: `.97 ..3 ..2`
Block 1: `.97` -> `.`, `9`, `7`
Block 2: `..3` -> `.`, `.`, `3`
Block 3: `..2` -> `.`, `.`, `2`
R5 = `. 9 7 . . 3 . . 2`

Row 6: `56. ... ...` -> Wait, visual says `56. ... ...`?
Prompt visual:
`.97 ..3 ..2` (Row 5)
`56. ... ...` (Row 6)? No, let's check the single line again.
`...75.....97..3..256.......6.1...3..2....5..6.7..9....`
Let's parse the single line carefully starting from index 0.
0-8: `...........1` (Row 1) -> `.......` + `.` + `1`? No, count chars.
String: `...........1`
Count: 1,2,3,4,5,6,7,8 dots, then '1'. Total 9 chars.
So R1 = `. . . . . . . . 1`.

9-17: `3.527.4..` (Row 2)
Chars: `3`, `.`, `5`, `2`, `7`, `.`, `4`, `.`, `.`. Correct.

18-26: `...4..8.` (Row 3)?
Let's check the single line substring at 18.
Indices 18,19,20,21,22,23,24,25,26.
String from prompt: `...........13.527.4......4..8....75.....97..3..256.......6.1...3..2....5..6.7..9....`
Let's slice it manually.
0-8: `...........1` (Wait, 8 dots + 1 = 9). Correct.
9-17: `3.527.4..` (9 chars). Correct.
18-26: `...4..8.` ?
Let's look at the remaining string after R2: `......4..8....75.....97..3..256.......6.1...3..2....5..6.7..

Grid tricky-1 of set v1, 24 givens. Puzzle as one line: ........13.527.4......4..8....75.....97..3..256.......6.1...3..2....5..6.7..9....