All right, let's go with the first game 
:
2...Nc6 3. Nf3 d6 4. Bg5 Qd7 5. exd6 Qxd6 6. Nc3 f6 7. Bd2 Bg4 8. h3 Bh5 9. e4 O-O-O 10. Bd3 Ne5 11. g4 Nxd3+ 12. cxd3 Bg6 13. d4 h5 14. g5 Qe7 15. Qe2 Re8 16. O-O-O Bxe4 17. Qxe4 Qxe4 18. Nxe4 Rxe4 19. Rhe1 Rxe1 20. Rxe1 Ne7 and white has lost its advantage, ½-½. The first refutation attempt has failed.
Actually, I don't understand how white was able to lose a pawn starting from this position
There should be a white's error somewhere, I'll check it again. 
Hmm ... already 7. Bd2 looks really suspicious. Okay, a bit later I'll make a test again using a different 7th move. 
cjxchess16: Thanks a lot, it was really helpful! I acknowledged it in the first post. Just looking at the diagram in post #3, it's clear that white should win.
Besides, 3 .. d6 is not in the spirit of a gambit. If you play a gambit you need to be able to keep the pressure on and not playing moves that decreases your attacking changes by changing queens early in the game.
All right. Please give the most viable black line to check it out.
I have won several games with this Gambit. And there is a trap that many people (not very high rated obviously) constantly fall to.
I have won several games with this Gambit. And there is a trap that many people (not very high rated obviously) constantly fall to.
Please post this trap.
Obviously a good player will never do this. But weak players fall to this very very often
Besides, 3 .. d6 is not in the spirit of a gambit. If you play a gambit you need to be able to keep the pressure on and not playing moves that decreases your attacking changes by changing queens early in the game.
All right. Please give the most viable black line to check it out.
He's probably referring to 3...f6. After 3...d6 there is the possibility of White refusing to capture on d6. But after 3...d6 4.e4 Bg4 5.Nc3 de it looks like Black just won a game of chicken.
Also, I'm pretty sure that White will just take the pawn if he wants to attempt to "refute" this. I don't see any reason not to take it. I also don't see 3...d6 4.Bg5 in the database I'm using. Maybe there are some games missing or something but most people seem to be playing 4.e4 here.
Also, I'm pretty sure that White will just take the pawn if he wants to attempt to "refute" this. I don't see any reason not to take it. I also don't see 3...d6 4.Bg5 in the database I'm using. Maybe there are some games missing or something but most people seem to be playing 4.e4 here.
ChessOK evaluations of moves after 1. d4 e5 2. dxe5 Nc6 3. Nf3 d6:
Explorer's evaluations of 3 best moves (d=20):
So, 4. dxe6 is not within the 3 top moves and 4. e4 is suboptimal too.
Well, adopting my procedure
https://www.chess.com/forum/view/chess-openings/experimental-procedure-to-refute-openings-application-to-the-latvian-gambit
I wanna see whether black has any chances to survive while playing the accepted Englund gambit 1. d4 e5?! 2. dxe5
I'm starting with 2 test games
making to play Explorer vs Explorer (i.e. Stockfish 8 vs Stockfish 8) at depth d=20.