Mieses Opening
Chesspedia, the Free Chess Encyclopedia.
The Mieses Opening is a chess opening move 1.d3. It is named after the German master Jacques Mieses.
It releases the Queen's 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 20 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.
Its most famous use came in the third game in the rematch between Garry Kasparov and the Deep Blue computer in 1997. Kasparov correctly believed that the computer would play the opening poorly if it had to rely on its own skills rather than on its opening book, but the game was drawn.
It is considered an irregular opening, so it is classified under the A00 code in the Encyclopaedia of Chess Openings.