Goat Horns Opening (1.e4 a6 2.d4 c6)
The “Goat Horns” that ChatGPT taught Messi in his 21 October 2026 video is 1.e4 a6 2.d4 c6, followed by …d5. It isn't listed under that name in opening catalogues: it's the St. George Defense (1…a6) turned into a Caro-Kann with an extra …a6. It's playable, but it gives away a tempo: in 942 Lichess games between players rated 900 to 1700, White scores 53.8%.
The moves
1. 2. 3.
Black starts with …a6, which controls b5, and follows with …c6, which prepares and supports …d5. With …d5 Black hits the e4-pawn: the same idea as the Caro-Kann, where …c6 and …d5 come without …a6 in between.
Does it work? The numbers
Lichess games from September 2026 and Stockfish evaluations at depth 22. A score above 50% is good for White.
- Players rated 900 to 1700 (average 1390)
- 942 games · White 53.8%
- Online players rated 2200+
- 105 games · White 57.1%
- Stockfish after 2…c6
- +0.69 for White
- Stockfish after 3. d5
- +0.60 for White
- Regular Caro-Kann (1.e4 c6 2.d4 d5)
- +0.45 for White
How White answers
Among club players, after 2…c6: 3. in 38% of games, 3.c4 in 14%, 3. in 13% and 3.e5 in 10%. Against 3., the best is to carry on with …d5 (White scores 50.8% in 190 games). If you play …e6 instead, White scores 63.4%, though from only 56 games.
The problem: a tempo down
In the Caro-Kann Black plays …c6 and …d5 in two moves. In the Goat Horns it takes three, because …a6 comes first. White uses that tempo to develop one more piece, which is why Stockfish gives White a bit more than in the regular Caro-Kann. It doesn't lose on its own, but it gives Black nothing the Caro-Kann doesn't.
Verdict
It works as a surprise in fast games, especially against opponents who are lost without theory. If what you like is the …c6 and …d5 idea, learn the Caro-Kann: it's the same structure without giving away the …a6 tempo.
Frequently asked questions
- Is the Goat Horns a real opening?
- Not under that name: it doesn't appear in opening catalogues or in the Lichess database. The moves are real and played, though: 1.e4 a6 is the St. George Defense, and with …c6 and …d5 it turns into a Caro-Kann.
- Is it good for beginners?
- It's easy to remember and leads to a solid structure, but it loses a tempo compared with the Caro-Kann. If you're starting out, you're better off learning the Caro-Kann or the Scandinavian, which are just as solid without giving that tempo away.
- What does Planchetto have to do with Messi or ChatGPT?
- Nothing. We analysed the opening from the video because lots of people are searching for it, with the same Lichess and Stockfish data we use across the site.