I have been playing Nimzo Indian + Bogo Indian combo since 2010 and this is my favorite opening with both sides. The Nimzo Indian is also a very forgiving opening, one mover order mistake in the opening generally does not leed more trouble than a slightly worse position. The traditonal Nimzo Indian partner is the Queens Indian defence. I do not know why but most white players prefere to play against Queens Indian rather than Nimzo Indian or dodge both by playing 3 g3. The advantage of Bogo Indian is that it works vs both 3 Nf3 and vs 3 g3. However in Correspondence Chess I think that Ragozin Defence and to enter black side of Catalan are a better tag team partner to Nizmo Indian. I have also experimentet a bit with Queens Indian Defence, the traditional Nimzo Indian partner. The old mainline with Bb7 instead of the modern Ba6 allows easy transposing vs some flank openings and move orders as well as avoids a dangereus gambit.
In practical over the board clublevel play d-pawn specials are more common to meet than both Nimzo Indian and Bogo Indian (or other combo) together. Due to that I play lines with black that cuts down the workload while still being active and solid.
While I have not played or posted any new moves, in 2012 I asked GM John Emms to make an update on Nimzo 4 Qc2 Nc6 variation at Chesspublishing.com subscription section and so he did and thanked me for my thoughts and a timely reminder and that monts sections update only covered that variation! The update in turn inspired the later book "Opening Repertoire: Nimzo and Bogo Indian" by Christof Sielecki. I have also made som experiments in Nimzo 4 Qc2 Nc6 5 Nf3 that I castle at once instead of playing the book move 5 .. d6. I am also one of few players who regulary plays 4 .. Nc6 vs 4 Nf3 Nimzo where white has nothing better than 5 Qc2 transposing to 4 Qc2 Nc6 Nimzo.
In Correspondence Chess I have played some rare lines in both Nimzo Indian, Bogo Indian, Queens Indian and Ragozin so these games may have effected theory unlike my over the board games. Since I played Bogo Indian, a rare opening in Correspondence Chess, I might have effected this area most since my books has often never covered several specific lines that was played in these games. I played Queens Indian with Bb7 and the new Na6 idea so I mihgt have effected theory there as well.
In Correspondence Chess I have played Bogo Indian in many games but only played Nimzo Indian in a handfull of games yet except some of my Ragozin games since the positon can arrise via Nimzo 4 Nf3 d5 move order. I have not loses a single real Nimzo game in Correspondence Chess, mostly draws but I won a few games as well. I also played a game that started as Bogo Indian, became Nimzo Indian and ended up as Queens Indian.
I have experimentet with 3 different replys vs Qc2 Nimzo in Correspondence Chess games. I have played both 4 Nc6, 4 d5 and 4 b6 in different games. I think 4 d5 gives black more easy play than the other options but involves some forced draws so I played Nc6 instead and won vs a lower rated. I also tried b6 vs Qc2 vs a much higher rated since I was inspired by Marins recommendation but he missed and easy improvment where white is more than 1 pawn better in an material equal position but luckly I had an other base about b6 and I played it move instead somo move furhter in and I manage to draw without to much trouble.
The reason for that are that Nimo Indian Defence has a excellent reputation and are as good shape in all line and black has multiple playable setups against each move. I have played more Bogo Indian games than Nimzo Indian games even in over the board chess, but in over the board games I have at least played Nimzo Indian in a few games.
Bogo Indian are on the other hand an underrated opening and thus many white player allows it both over the board and in Correspondence Chess. As a bonus, Bogo Indian can also be played vs Catalan (3 g3).
I have played Bogo Indian in many Correspondence Chess games and have only lost two Bogo Indian games. I have also won a few games Correspondence Chess games with the Bogo Indian and have more wins than loses and most of my Bogo Indian games was easy draws, including vs hiegher rated.
In the first game I lost I had analysed a seqvens of moves in the late middlegame to completly equal but managed to commit the last move instead of the starting move and the move was a a concrete postional blunder where the evalution changed from + 0.10 to + 1.4 after whites correct next move and I was slowly crushed. In the other game I lost I dropped the Knight the wrong square in the opening by accident vs a 400 elo higher rated player. It did not lose material and I thougt it transpose to a harmless main like but my opponent found a better move where he got a slight plus and he started to played better Chess than I did on every move so I resigned since I had no counterplay and was competly tied up over the entire board.
In three later games positions appered when Marins b6 analyses was completly incorrect and computer gave white a large advantage in 4 Nd2 b6 line, more than 1,5 paws better for white in material equal positions. I did however manage to save the 2 of the 3 games but is was more luck than strenth so I think that b6 is not a good move vs 4 Nd2.
Marin thought that black would get tempo for an attack and optical black got pieces towards Kingside but white is much faster at both Queenside and in the centre. I have played other lines vs Nd2 in Correspondence Chess in the past and was never in danger os losing and I also played some draws in other b6 games without danger of losing but I dont think I will play Bogo Indian in any more Correspondence Chess games, unless some other author comes up with massive improvments or else I will play something else than b6.
For a long time I have been playing with the idea to play the "Nimzo Indian / Queens gambit declined" hybrid called Ragozin Defence. I tested it in 5 Correspondence Chess games before deciding to switch to it or not or to play it as main weapon or as tag team partner to Nimzo. I won the 1st game I played it. Every other of my test games became draws. The defence can transpose into several variations of Nimzo Indian even as independent option and not only as tag team Nimzo team partner. I play Ragozin as main defence using a Queen Gambit mover order in over the board games. I played lots of other Correspondence Chess games and mainly draws.
I recently started to try out Queens Indian as Nimzo Indian tag team partner in a few Correspondence Chess games. All my 3 first test games became easy draws while I was a bit worse in the 4th games. I belive that the line practical in over the board too since the old line with Bb7 instead of Ba6 allows more easy play vs some flank openings and avoids a gambit. I belive in synergi effect so I started to play in over the board games as well. I was inspired by a recent book but the book has lots of analytical errors, I was lucky to discovered this before playing any game. It also had stange recommendations and litteratur used was mainly from 1970 and engine used a older ancient Fritz version from 2010 and database was an online database so I used other sourches than the book. The book showed several model games and ideas but not good as repetour book so sort of wasted money.