Napoleon Commits the Guard

In the final throes of the Battle of Borodino, some of Napoleon's top generals asked that he commit the Imperial Guard to the battle in the hopes that it would raise the morale of the other French troops and allow a final assault that would decide the fate of the Russian Army and the war itself.

Napoleon refused to commit the Guard for fear that it would be decimated in the battle. Borodino would by a French Pyrrhic victory at best, and the Russian Army would withdraw to fight another day.

So what effects on the battle and the war would there be if Napoleon had committed the Guard to the battle?
 
I read somewhere, I don't remember where so it may not be true, that during his exile he admitted that withholding the guard was one of his only military regrets.
 
The problem is that what Napoleon said or dictated to his interviewées is often not very trustable. He often gave different and even sometimes contradicting explanations of why he made this mistake or of what he should have done.

Concerning Borodino, if he had committed the Guard, it woul have changed ... nothing.

Borodino OTL was a french tactical victory. However it remained a part of a campaign that had already become a strategic nonsense. Anyway, the russians would retreat as soon as they would risk being crushed. And the russians had reserves. So, committing the Guard may probably imply just heavier losses in both sides. And Napoleon was lacking reserves while his supply like was overextended.
 
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