Ahoy hoy,
You might want to fix diagram 11, it doesn't blunder a rook....a pawn maybe but not a rook
As for the rest,
After 1.g4 d5 2.Bg2 c6 3.h3 e5 is common but I for the life of me don't understand why 3....f5 is not played more.
Also 1.g4 d5 2.Bg2 Bxg4 3.c4....3...dxc4 is at best unwarranted and at best dumb. Better is 3...d4! The Romford which maybe theoretically suspect but over the board can be quite complicated.
Peace
Oh, thanks for letting me know about the error!
Yeah, 3...d4 makes things way too complicated for me, especially since I would have to push the bishop to d7. I think what I mostly did was just take the rook, and try to kick the bishop out of g4.
The engine move 5. h3 Bh5 6. Nf3 Rb8 7. Bxf3 Bxf3 made it especially hard for me to develop anything because of the black pawn in the d file.
But thankfully, almost everyone I played with was either going for c6 or Nf6, to support the pawn...
I have been using Grob since a month ago, and it has been quite fun for me recently. Based on my recent experience, I realised that there are clear advantages to using the Grob opening... If you don't use any traps. Traps rarely worked anyway, so instead, I decided to stick to inducing obvious responses from the opponent. When this happens...
1. The response from the opponent is very, very limited compared to other "normal" openings, meaning it is easier to memorize the lines.
2. Grob opening can go wrong so easily on both sides. Opponents capturing wrong pawns, or trying to pin materials carelessly will almost instantly result in forks or pins. But you have to be constantly be careful about forks or pins too. In my elo (1500~1700), even though the opponent doesn't often fall for opening traps, they often allow forks and hanging pawns early game, probably because they are not used to the position. And I have almost never seen anyone perfectly counter the Grob opening, which is:
Surprisingly, almost no one plays this way.
Below is the list of opening responses I got used to when using the Grob Opening.
I found that from 1000~1400, the opponent often responds with d5, which I always go with the Grob Gambit. If the opponent takes the pawn, go for the Fritz Gambit, eventually manoeuvring the bishop to an aggressive square. Also, it is useful to develop the queen to b3, threatening the b7 pawn and the rook.
The next frequently appearing response is e5, which I also respond with the Grob gambit.
Also, Grob opening denies early knight developments since the g4 pawn will most certainly kick the knight on the g file, and the other knight's path is blocked by its own pawns.
The important thing to remember while playing Grob is that
1. Grob is effective since the opponent will most certainly lack opening knowledge. Even if they don't make blunders, their opening responses are almost never completely accurate.
2. After the first 3~4 moves, it is crucial to develop the centre pawn. Pushing the pawn to d4 is always smooth, but if pushing the pawn to e4 is impossible, always push the c4 pawn and use the knight and queen to put pressure on d5. the e file pawn should be tried to be captured by either trading or by forking.
Putting pressure:
While using Grob, it almost feels like the opponent's responses are either fixated on limited variations or just a complete blunder. The opponent almost always responds with d4 or d5 (like 95%). And even in 1500~1600 elo, only 5 to 10 out of 100-ish games I played had an opponent who knew how to perfectly counter the Grob opening, and half of them were using engines, I later found out.
The fact that you already have the knowledge of where the opponent often blunders or makes mistakes, or memorized an engine move that worked very well previously, works as a huge advantage. Since you only get d4 or d5 responses, there is a lot less to memorize.
...While the opponent has probably never seen the opening variation before.
The most common errors in responses are:
For the forks,
Try Grob. It is easy to learn, and especially fun if the opponent blunders like this, trying for an early checkmate: