- "You know what my nickname was in chess club?The chess vulture because I peck away at my opponents until there's nothing left but a rotting carcass."
- —Sylvester to Walter
"Keep It in Check, Mate" is the sixteenth episode of the third season of Scorpion and the sixty second of the series overall. It aired February 13, 2017.
Walter and Sylvester enter an international chess competition under cover on foreign soil for Team Scorpion in order to extricate a U.S. spy before her identity is exposed.
- Elyes Gabel as Walter O'Brien
- Katharine McPhee as Paige Dineen
- Robert Patrick as Cabe Gallo
- Eddie Kaye Thomas as Toby Curtis
- Jadyn Wong as Happy Quinn
- Ari Stidham as Sylvester Dodd