Also something important to note. The inaccuracy mistake and blunder are only relating to the outcome of the game. For example you can sac a queen in a +30 position and go down to like +7 and it will only mark that an inaccuracy.
If chess is truly a drawn game from the start then there should not be any possible game that ends in checkmate without at least one mistake IE when the game goes from drawn to lost.
If chess is truly a drawn game from the start then there should not be any possible game that ends in checkmate without at least one mistake IE when the game goes from drawn to lost.