solve

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]

1. c4 {c4 kickstarts your queenside development and uses a flank pawn to control
the center.} 1... e6 {This move opens up the scope of my bishop.} 2. a3 {That's
a very good move.} 2... d5 {What am I threatening to do $2} 3. d4 {Great response
to my threat.} 3... Nf6 {Let's see what my knight can do.} 4. Nf3 {Developing
your knight.} 4... Qd7 {I'm always happy when a student starts off developing.}
5. e3 {Defending your pawn.} 5... Qe7 6. Qa4+ {Hello, your majesty.} 6... b5
{You have a way to win material now. Look closely $1} 7. Qxb5+ {You found it.
Pieces are more useful when they can see more squares. Nice idea.} 7... Nfd7
{Check, blocked $1} 8. Bd2 {Your pieces are developing nicely.} 8... c6 {Keeping
my pawn alive.} 9. Qb3 {Moving your queen to safety.} 9... Nf6 {My knight takes
a commanding position.} 10. Bb4 {Attacking my queen, winning the initiative.}
10... Qc7 {I'm offering you a trade.  What will you do $2} 11. Bd3 {You can start
to think about castling.} 11... Bxb4+ {I'm getting ready to castle.} 12. axb4
Nfd7 13. O-O {OK $1 With your king out of harm's way, your other pieces can
maneuver more freely.} 13... Ne5 {The more squares a knight can attack, the
better.} 14. Nxe5 {You should end up winning a knight if you find the right
moves.} 14... Qd8 15. e4 {To take or not to take $2 That is the question.} 15...
dxc4 {Did you notice my pawn $2} 16. Bxc4 {I take. You take...} 16... f6 {My pawn
kicks your knight, forcing it away.} 17. Nd3 {You moved your knight out of
trouble. Good $1} 17... Bb7 {Time to get this bishop into the action.} 18. Bxe6
{Could you take that back $2 I was just getting ready to castle. No $2 Fine then.}
18... a5 19. bxa5 {You revealed an attack on my bishop.} 19... Ba6 {Moving my
bishop to a safer square $1} 20. Rd1 {You've played strong moves so far. I'm
impressed.} 20... g6 *