World chess champion Garry Kasparov during the first six-game match against IBM supercomputer Deep Blue, Pennsylvania Convention Center, Philadelphia, February 10-17th, 1996
First people thought that chess engines could never beat humans, and then Deep Blue showed them that this is wrong. This changed the way grandmasters thought about computers, and soon enough chess engines became a part of every top-level player’s toolbox. This eventually affected the way tournaments are held as well, because the rules had to be changed so that games have to be completed during one day and they cannot be adjourned, because computer analysis during the break would affect the game too much.
