Related Clues:

• Non ____
• Added to
• Like pairs of socks
• Defeated in chess
• Sign that can mean "better than"
• Won, in chess
• Checked thoroughly?
• Beaten, a la Bobby Fischer
• Checked for the last time?
• Addition sign
• Beat at the board
• Won a game of chess
• Unable to escape, in a way
• Beat at chess
• Sign of the cross