ARVES is an international club for chessplayers who are specially interested in Endgamestudies.
An Endgamestudy is a chessposition with a task mostly like:
"White plays and wins" or "White plays and makes a draw".
There should be only one way to the solution and there is also always some kind of surprise or something unexpected.
An element of Art is in it.
A typical and fantastic example is the following position:

"White plays and makes a draw."
White seems to be totally lost.
The black pawn is passed and also the black king almost has captured the only white pawn at c6.
But still a miracle is going to happen...!.
Click here for the solution.
Composed by Richard Réti in 1921.