I accidentally touched my bishop and opponent's "Knight", while reaching for my queen during a game, almost simultaneously. Am I forced to take the opponent's piece?
FIDE Article 4.3:
Except as provided in Article 4.2, if the player having the move touches on the chessboard, with the intention of moving or capturing:
a. one or more of his own pieces, he must move the first piece touched that can be moved
b. one or more of his opponent’s pieces, he must capture the first piece touched that can be captured
c. one piece of each colour, he must capture the opponent’s piece with his piece or, if this is illegal, move or capture the first piece touched that can be moved or captured. If it is unclear whether the player’s own piece or his opponent’s was touched first, the player’s own piece shall be considered to have been touched before his opponent’s.
If a player touches a piece without the intention of moving or capturing (e.g. fingerslip), there is no touch move restriction.