you can find the puzle here :
http://www.chess.com/forum/view/more-puzzles/3-quick-puzzles
http://www.chess.com/article/view/fatigue-wins
you can find the puzle here :
http://www.chess.com/forum/view/more-puzzles/3-quick-puzzles
http://www.chess.com/article/view/fatigue-wins