"The Machine That Won the War" is a science fiction short story by American writer Isaac Asimov.
It is one of a loosely connected series of such stories concerning a fictional supercomputer called Multivac.
Three influential leaders of the human race meet in the aftermath of a successful war against the Denebians.
Discussing how the vast and powerful Multivac computer was a decisive factor in the war, each of the men admits that in fact, he falsified his part of the decision process because he felt that the situation was too complex to follow normal procedures.
Finally, Lamar Swift, executive director of the Solar Federation, reveals that he had not trusted the reports produced by Multivac, and had made the final decisions purely on the toss of a coin.