Minesweeper Lesson 4 - 1-2-1 & 1-2-2-1 Patterns

This lesson shows two more common patterns you will definitely encounter when solving boards of any caliber. They are both comprised of 1-2 patterns (check lesson 3 if you haven't learned the 1-2 pattern) but knowing the hybridized 1-2-1 / 1-2-2-1 patterns is useful for quick recognition. As always feel free to leave any questions you may have in the comments and I'll be sure to answer them! :) #minesweeper