This is the first puzzle of this type that I created for the practice of the Indian Puzzle Team participating in the World Puzzle Championship 2009. Nowadays this is the Classic Puzzle Type, However that time this puzzle type was very new and I created this puzzle to understand the rules of this puzzle type. Later I created some more puzzles of this type, which I will be posting here later. This puzzle type also appeared in the 18th World Puzzle Championship in Antalya (Turkey). This puzzle type is also known as the Black and White puzzle. However, with the name Black and White, there are many different puzzles available nowadays. So I am keeping the name Ying Yang and will be using the same name for all my future posts for this puzzle type.
I am posting this Ying Yang in Mini Puzzles Series as the 17th puzzle. Can you solve this Ying-Yang puzzle?

## Rules of Ying Yang puzzle

Fill each empty cell with either a black circle or a white circle. All white circles should form a single interconnected area and similarly, all black circles should form a single interconnected area. There cannot exist any 2x2 cell region consisting of the same color circles anywhere in the grid.
 Ying Yang (Mini Puzzles Series #17)

Ying Yang (Mini Puzzles Series #17) Solution

Next Mini Puzzles Series puzzle: Smashed Sums (Mini Puzzles Series #18)

Solution of Fun With Sudoku Series puzzle titled Classic Sudoku (Fun With Sudoku #91)
 Classic Sudoku (Fun With Sudoku #91) Solution