Learning to play chess

If you think SparkChess is not playing correctly, you should have a look here. Some chess rules are subtle and casual players may not be aware of them.

I just moved my pawn two squares and then it disappeared!

Most likely you were the victim of an en-passant take. Don’t feel too bad, many casual players are not familiar with it. Please consult the official chess rules for details.

The enemy pawn advanced to my first row and then a second black queen appeared – Why?

That is promotion; a pawn will be promoted to a queen (or other piece) if it reaches the last rank. Please consult the official chess rules for details.