The claim is that, in some cases, the human operators of Deep Blue intervened and played a different move than what the computer indicated (<a href="https:&#x2F;&#x2F;www.chess.com&#x2F;blog&#x2F;clizaw&#x2F;did-ibm-cheat-kasparov" rel="nofollow">https:&#x2F;&#x2F;www.chess.com&#x2F;blog&#x2F;clizaw&#x2F;did-ibm-cheat-kasparov</a>)<p>So, yes, you can cheat in a perfect information game.