“It’s an analysis board,” Sage said softly.

She tipped the screen two inches toward him so he could see the digital grid.

“Look at this knight fork.

It takes three moves to set up, but White loses a rook whatever happens.”

Tai stared at the glowing screen, his jaw shifting side to side in the firelight.

“That’s dumb.”

“It’s not dumb,” Sage said.

“It’s a tactical endgame from 1974.”