# Fixing a Binairo Mistake

The rules of Binairo are simple:

1) Each row and column must have an equal number of black and white circles.
2) There can be no horizontal/vertical line of three like-color circles.

Starting from a position of fixed circles (indicated by those with dots in the center), one can complete a grid using logic.

In the puzzle below, provided by this website, I have made at least one mistake (hopefully no more than one), and I know this because filling in any of the empty cells would break one of the rules. I am not asking you to solve this puzzle for me necessarily, but rather, I want to know: Is it possible to determine logically where I went wrong without starting over from scratch or randomly erasing cells? What would you do to correct your mistake if you found yourself in this position while solving the puzzle?

• Not a definitive answer, but are you using the undo-redo arrow buttons above the puzzle grid? Feb 7, 2019 at 11:20
• Those buttons provide little in terms of methodology. I was hoping for more of a deductive option. If the answer ends up being "no", then they will suffice for the future, if the situation occurs again. Feb 7, 2019 at 19:39
• No, there's pretty much no way to do it without essentially re-solving the whole puzzle. Logical deductions can ripple through the grid, and if any number of them can be wrong the fastest option is just restarting.
– Deusovi
Feb 8, 2019 at 14:31
• As Deusovi says, it is practically impossible to correct an error that isn't quickly noticed. In this particular grid, you have 11 cells in error. Feb 9, 2019 at 4:36