Done by dividing the group of players, ordered from strongest to weakest, into two strength ordered sets, one containing the stronger players of the group, the other containing the weaker players of the group. The strongest player of the stronger set is paired with the strongest player of the weaker set. The next strongest player of the stronger set is paired with the next strongest player of the weaker set, till all players have been paired or there is only one player unpaired.
This method also aims to have the strongest players play each other in later rounds, to produce exciting games at the end of the tournament, but tries to avoid the disadvantage of giving the top players a bad SOS due to their first round pairing.
Slide pairings are especially popular in the first round of Swiss tournaments