List of all 400 legal openings in 2 plies (by # of master games)

 Ah, so moves that would be annotated with a square 'ffwere "legal move" replaced with "sound move"[ i.e. maintains theoretical result of round's score].  I wonder if acute'ly forcible scenarios particularly for several turns by both sides tend to be more drawing than overtly obtuse ie nothreatening/quiescent positions 

The acuteness often appears in gambits, exchanges but not necessarily. In my thread about acuteness U can see an old example, called Immortal Draw, consisting exclusively in 1-acute moves.

#67 NLA: Symmetrical 1. b3 b6 is added.

#68 van't Kruijs: Indian 1. e3 Nf6 is added.

Okay, I was busy, but now I'm back and continue to maintain and complete this list.

Current status: 69 openings with 160+ games in the Explorer.

Yes, I know, evaluations depend on engines and statistical evaluations on databases. They clearly shouldn't be taken as the final truth. Nevertheless, it gives some indications on good and bad moves.

It's explained in the first post. The purpose is to make the full list with some additional info. What can be unclear here ?!?

I was busy with my job but now I'm planning to maintain this awesome thread. 

I started to correct evaluations with new Stockfish 9+ data. 

#70 and #71 added. 

#72 1Bd 1. b3 d6 NLA: Pirc is added.

#73 van Geet: KF, where KF stands for Kingside Fianchetto. 

74 openings with 134+ master games. 

The last adding: #75 Englund gambit, 130 master games. 

#76 Anderssen: QP, 123 master games. 

oh wow! your are still on it!

Yeah, I'm quite patient. LoL 

#77 Grob: QP, 119 master games. 

Current status: 82 entries, all openings with 100+ master games.