Here are the Checkmate Showdown System Requirements (Minimum)
CPU: Intel Core i3-4160 @ 3.60GHz
RAM: 6 GB
VIDEO CARD: NVIDIA® GeForce® GTX 480, GTX 570, GTX 670, or better
DEDICATED VIDEO RAM: 1536 MB
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 7 64-bit
SOUND CARD: DirectX compatible soundcard or onboard chipset