13
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The standard Masyu rules apply.

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1
7
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Solution

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Step 1

Start with some basic deductions concerning circles that are next to a wall.
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Step 2

Notice that we can't go through the white circles in rows 4 or 9 without making a loop so these must be crossed horizontally. Additionally, this forces the path descending from the top of column 3 to go left since going right would also force an issue in the top left corner. We can develop in the top left to get the following
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Step 3

If the path goes through the black circle in row 4 to the left, then a little bit of development leads us to the following untenable position.
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Hence, it must be that it goes to the right through this circle. Some more development in that region leads us to the following,
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Step 4

If the path continues from the black circle in row 7 to the left, we can develop and get to the following untenable position.
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Hence, the path must continue to the right from the black circle in row 7 and some more development leads us to the following position.
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Step 5

From here, we see that the path must go horizontally after traversing the white circle in row 4. The deductions from there are reasonably straight forward.
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1
  • $\begingroup$ Great job and well done! You might need to point out why are they "untenable positions", especially the subtle one on Step 3 :) (and also FYI, black circle on line 6 has similar logic to the one on line 7 -- if that's somewhat helpful too for other solvers as well!) $\endgroup$ – athin Apr 15 at 21:26

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