After finding little value in a treatise by Pedro Damiano, this man wrote the Book of the Liberal Invention and Art of the Game of Chess. For 10 points each:
[10m] Name this priest who names a common chess opening often called the "Spanish Game" that opens with the sequence e4-e5, Nf3-Nc6, Bb5.
ANSWER: Ruy Lopez [Ruy López de Segura]
[10e] Lopez was known for his chess theory surrounding a gambit named for this piece in which white moves the pawn to f4. This piece can only move two squares toward the rook in a move called castling.
ANSWER: king [or King's Gambit]
[10h] This chess player names "Modern Defence" and "Defence Deferred" variations of the Ruy Lopez. This man lost the World Chess Championship to Emanuel Lasker.
ANSWER: Wilhelm Steinitz [or William Steinitz]
<Noah Sheidlower , Other Academic/Cross-Category - Any>