The Slav or semi slav?
The slav has too many complicated lines, I don't know why that would be good for a beginner.
QGD follows principals very well.
Which (of course) doesn't mean it's bad or only for weak players... it has (probably?) been played in every world chess championship match since the beginning of time.
For a kid everything he learns is exciting. Just give them the feeling that it is new and it is important and they will look at you like you are Gandalf or Harry Potter.
And that explains a lot. However, a kid who learns karate and is excited that he or she can kick azz does not yet have the karate perspective. And a teacher who would ignore teaching patience and discipline would be a complete idiot.
Chess is not karate.
A kid needs to be mainly excited and happy when playing chess. He must have fun. He must not take it , at first , too seriously. He must enjoy the process of playing, without caring if he wins or lose.He must see losing as part of the process.The kid that eventually improves feels the need for discipline during study and he will be disciplined. Guided , advised in being focused and careful, yes, but disciplined, certainly not. Especially if we are talking for a 9-year-old kid, it would be a huge mistake. It could even make him hate the game.
tell that to all those 10 year old asian kids rated 2000 i played at world open. i think "fun" is overrated.
Fun is not overrated but eit's different for every kid. Carlsen said that he never followed a strict disciplined program. He studied a lot but whenever he wanted and whatever he wanted.
Discipline is not a guarantee of good results in chess. Maybe 50 years ago in Soviet Union it was but we live in different times and in a different world.But all this discussion is theoretical. I'm sure the father knows very well what to do.
dont they all?