What are all the good opening combos?

One well known very good combo is the Caro-Kann + the Slav:

• The main objective of both of these openings is to develop the light-squared Bishop to f5 before it gets locked inside the Pawn chain.
• They tend to lead to roughly similar Pawn structures.
• On average they both tend to lead to positional, quiet and strategic games.
• And most importantly, if you choose both of these openings, against 1. c4 you can play 1...c6 which can transpose into either a Slav (2. d4) or a Caro-Kann Panov/Pseudo-Panov (2. e4).

I would like to know what are all the other possible combinations of openings which work well together.

I am only interested in combos where both openings are sound.

And if possible also explain why exactly the openings work well together.

The caro-kann and the slav are two totally different openings. They are not similar at all.

Black 1 g6

White 1 g3

What more do you need

1 e4 Nf6 and 1 d4 Nc6 for black. Those tricky knights :p

This is probably your best starting point:

https://en.wikipedia.org/wiki/Pawn_structure

Sicilian Dragon + Modern Benoni. Both have similar structures and are sharp and attacking. They can also be paired with 1.c4 2.g3 as White, it has similar structures but it's not sharp and attacking.

Which Black opening against 1.e4 would work well together with the QGD?

This guy is either a troll or an idiot

French and QGD

In either case, his claim is right, though.

No, he isn't. The openings are different, but the pawn structures are the same and the middle game strategies resulting from them are the same.

There is a whole group of openings which reach this same pawn structure.

There are two different lines in the French where black plays an early dxe4, the Scandinavian, the Orthodox QGD, Slav/semi-Slav, and lines in the Caro-Kann … of course there are ways white can avoid this pawn structure, but a lot of players build their whole black opening repertoire around getting this pawn structure through varying openings.

People here are so antagonistic, contrary and polarizing. There isn't any point in all this condescension. Someone asked for help, and two other people start arguing with each other. These message boards are toxic.

In the Caro case, white misses his e-pawn, and in the Slav one, his c-pawn.

So, the plans and ideas of those two openingas  are totally different.

Understood, or not yet?

You're just factually wrong. That's what I understand.

You see, exactly the same, and similar, are two different concepts. Understand? 

Sure, I understand you are a stubborn fool. Plenty of the kind in chess dot com.

No, not really.

You see if you have red, pink and blue roses, they are all both similar and different. So Anyone can say anything is similar and someone else can come behind them and say, "no! It's totally different!."

Well, you would have been correct if you just pointed out the differences. So I can accurately say that the pawn structures are SIMILAR (not exactly the same) and this is correct. You can come behind me and say that it's totally different, and that is dead wrong.

The fact that black's d pawn is missing makes them all similar regardless of white's pawn structure.

The openings are different, the pawn structures are similar; with the exception of all those 1.e4 openings - those actually are exactly the same.

You're just in here trying to throw your weight around.

Which Black answer against 1.d4 would work well together with answering 1.e4 with 1...e5 2.Nf3 Nc6 ?

King's Indian

there are two ways to judge opening combos. one is to pair pawn structures in the middle game similarity. that is sound logic.

another way is to pair the opening move tree so the openings can match one another. for example black response to white d4 is to enter nimzo-indian, but white can avoid nimzo and force black into queens indian (KID). so it seems logic for black to pair nimzo indian with KID as a combo to reply to 1.d4 from black perspective. is this correct? ty

KID means King's Indian Defense, it is 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6, it does not pair well with the Nimzo.

The Queen's Indian Defense is abbreviated QID, not KID. The QID is 1.d4 Nf6 2. c4 e6 3.Nf3 b6.

The Nimzo, 1.d4 Nf6 2. c4 e6 3.Nc3 Bb4, can't be played against everything, it must be complemented with another defense. If White plays 3.Nf3 then the Nimzo is no longer an option, instead Black will have to choose between QID (3...b6), Bogo (3...Bb4+), QGD (3...d5) where White will have lost his option to play the Exchange Nge2, Modern Benoni (3...c5) where White will have lost his option to play the FPA and the Taimanov. So when White avoids the Nimzo Black is not forced to play the QID, Black has three other options each roughly as good as the QID option.

But pairing the Nimzo with the QID is actually a bit off-topic, because my thread is about pairing a 1.d4 defense with a 1.e4 defense, not pairing a 1.d4 Nf6 2. c4 e6 3.Nf3 defense with a 1.d4 Nf6 2. c4 e6 3.Nc3 defense.