Here's a free chess site.
I'd be in the same boat as Hightor. I can beat the computer to a certain level but i'm sure if i were to play a person i'd be slaughtered.
Thanks for suggesting that interesting site however their chess computer give some odd results at times, on the lower setting at least, in almost throwing away pieces in insane moves.
By the way years ago I found an interesting means to upset chess computers and it still seems to apply today.
After getting into a solid open position you go on a trading mission with the game peaces.
The chess program computers seem to this day not to handle well the large scale trading of pieces in the early mid game.