chess puzzles

do you have any interesting chess puzzles? you want to share it with us? If both answer are yes, you can test us here! i start off with a game from my games with a brilliant knight move^o^.

interesting

first,a queen trap.

next,a game with the saying;sac,sac,mate.

in this game, my opponent resigns. but the puzzle is, why did he resign?

NICE!

I played in a National tournament a few days ago,I beat a 1600 rated person,here is the game