How to use "drag & drop" on websites?

I use the adroid stock-browser and I'd like to play chess using e.g. http://www.shredderchess.de/schachproblem-des-tages.html Unfortunately you have to drag and drop the pawns. I tried several gestures, but I was not able to use the drag and drop feature. Do I have to change any options (where?) or should I use a different browser?