Mating Nets.
http://www.chess.com/tactics/?id=21429
http://www.chess.com/tactics/?id=90259
http://www.chess.com/tactics/?id=34465
B v N
http://www.chess.com/tactics/?id=430767 prevent pawn promotion
Pawn Promotion
http://www.chess.com/tactics/?id=23993
This forum is for tactics trainer links. Just keep editing your first post to add more links.