text: In the 1972 World Chess Championship, Bobby Fischer's first game against Boris Spassky went poorly after Fischer sent one of these pieces to capture a poisoned pawn.
full_question: In the 1972 World Chess Championship, Bobby Fischer's first game against Boris Spassky went poorly after Fischer sent one of these pieces to capture a poisoned pawn. Advancing a pawn to where it can attack one of these pieces is key to the Evans Gambit. This piece is advanced by white on the third move in the Torre Attack. Moving this piece one or two squares in front of a knight is called a (*) fianchetto, and is frequently used in hypermodern openings. How far this piece is advanced determines the difference between the Italian Game and the Ruy Lopez. These pieces, along with knights, are informally worth three points. For 10 points, name this piece which in chess can only move diagonally.
first_sentence: In the 1972 World Chess Championship, Bobby Fischer's first game against Boris Spassky went poorly after Fischer sent one of these pieces to capture a poisoned pawn.