He had nine positions on a sheet in front of Oliver, all of them comprising equal amounts of pieces for both warring sides, but all of them were completely different in who was winning or not.
"If I were to hide this one, would you remember it?" Volguard asked, his hand covering a position in which the white pieces had been forced to play a considerably more defensive battle, It was an odd situation, in which, despite black having far more attackers active, white was in a mightily advantageous position.
"Mm," Oliver said. "That is the defensive one…"
"Indeed. Do you remember where each piece was placed?" The professor pressed. "Set it up on the board if you remember."
Oliver began to, murmuring to himself all the while. "No… Needs to be one big wave in the counterattack, that wouldn't work…"
It took him a minute or two of fiddling, but after rerunning the model in his mind, he was confident it could be no other position but this.