Move Just One Matchstick to Solve This!! 

1=9-8

1-9=8

For me moving the whole board would count as several moves, so I wouldn't accept this as a possible solution. I also thought about 1 - 5 ≠ 8 or 1 ≠ 5 - 8 as solutions, but I think 1=9-8 may be the most elegant one.

Interesting

7+2=9

Move just one matchstick. Dats the rule! No board manipulation, dude! See better answers below ;>)

1 - 5 ≠ 8 or 1 ≠ 5 - 8

1 menos 6 igual 8? ¿?

1=9-8