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I am sure this puzzle has only one solution. Also the solver of this puzzle can put up a Yin Yang puzzle if they wish to start a series.

Rules of Yin-Yang:

  • Fill each empty cell with either a black circle or a white circle.
  • All white circles should be orthogonally connected, so should all black circles.
  • There may not be any 2x2 cell region consisting of the same circle color.

enter image description here

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    $\begingroup$ Why would you try to require any solver to make their own puzzle? That's both unenforceable and bad form - some people just want to solve puzzles, not create them. $\endgroup$
    – bobble
    Commented Nov 27, 2020 at 4:09
  • $\begingroup$ Sorry I am trying to start a grid deduction series where solvers can post their own puzzles. $\endgroup$
    – J.Spencer
    Commented Nov 27, 2020 at 4:12
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    $\begingroup$ You could try organizing a series in the main site chatroom, but we already have a puzzle-series thing going on - Chain Puzzles, which has its own chatroom for organizing. $\endgroup$
    – bobble
    Commented Nov 27, 2020 at 4:14
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    $\begingroup$ If people want to write their own puzzles, they can; some logic puzzle genres catch on. (Tapa and Nurikabe have both caught on around here in the past!) There's no need to require that someone else put one up. $\endgroup$
    – Deusovi ♦
    Commented Nov 27, 2020 at 4:14
  • $\begingroup$ Sorry I did not phrase that rightly. I have changed it. $\endgroup$
    – J.Spencer
    Commented Nov 27, 2020 at 4:19

1 Answer 1

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There are two important facts that make Yin-Yang puzzles significantly easier:

The Checkerboard Rule: No 2×2 square can be a checkerboard pattern.
And the Border Rule: The border of the puzzle must contain only one 'section' of each color; that is, the border changes color at most twice.

To start:

The black dot on the left has to escape left. Use the Border Rule to get most of the border filled out:
enter image description here

Some connectivity, and application of both the "no 2×2" rule and "Checkerboard Rule" gets us here:

enter image description here

More of the same:

enter image description here

And applying those rules again finishes off the puzzle:

enter image description here

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    $\begingroup$ May I know how to get those rules? Can you elaborate? $\endgroup$
    – 00xxqhxx00
    Commented Nov 27, 2020 at 5:37
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    $\begingroup$ @00xxqhxx00 If you break either of those rules, you can't connect both white and black to each other: If there are two separate white sections on the edge, and you draw a line between them, then one black section is on the left and another is one the right. The same goes for a checkerboard pattern; no matter how you connect the whites, one black will be "inside" the loop formed and the other will be outside. $\endgroup$
    – Deusovi ♦
    Commented Nov 27, 2020 at 5:46

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