The Mieses Opening is a chess opening that begins with the move: 1. d3
The opening is named after the German-British grandmaster Jacques Mieses.
White's 1.d3 releases his c1-bishop and makes a modest claim for the centre, but since it does not stake out as large a share of the centre as 1.d4 does, it is not a popular opening move. Of the twenty possible first moves for White, it ranks tenth in popularity. Nevertheless, since 1...d6 is playable by Black against any opening move from White, it is playable by White as well. Black has many reasonable responses, such as 1...e5, 1...d5, 1...c5, 1...Nf6, and 1...g6.
The most famous use of this opening was in the third game in the rematch between Garry Kasparov and the Deep Blue computer in 1997. Kasparov believed that the computer would play the opening poorly if it had to rely on its own skills rather than on its opening book. The game was drawn. It had been previously used by David Levy in a prize match against Cray Blitz, where White won.