Goat format ruling
Checkmate

Card effect (current official text)Tribute 1 Archfiend monster on your side of the field. During this turn, 1 "Terrorking Archfiend" on your side of the field can attack your opponent's Life Points directly.
Rulings
- Checkmate targets 1 Terrorking Archfiend on your side of the field as a target when it is activated.
- "Checkmate" is a targeting effect, targeting a specific "Terrorking Archfiend."
- If "Terrorking Archfiend" is equipped with "Twin Swords of Flashing Light – Tryce" when "Checkmate’s" effect applies, "Terrorking Archfiend" may attack directly twice.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.