Errors are an inevitable part of creating a game or maintaining a website. In many ways all the pieces of code are the chess pieces and all the planning is the chess board. You move the pieces across the board until you can manoeuvre them to either stalemate or check mate.
The stalemate is where you’ve hit a blank wall with errors, so you have to backtrack all previous moves to determine where you went wrong. The check mate is where you’ve succeeded in fixing the errors.
You always have to be one step ahead, knowing the moves up to the point the error occurred or knowing how to prevent them in the first place so the rest of it runs smoothly and error-free.