The curious case of Magnus' 5.Bc4 in the Open Sicilian
Last week, in the Magnus Invitational, Magnus Carlsen used the new move 5.Bc4 in the Open Sicilian first against MVL and a few rounds later against Nepomniachtchi.
How is this possible? Carlsen commented after the game:
"That was pretty sick! I just completely blanked after e6. I knew that this was fine for White, and I’d gone over it before the game against Maxime, and then then I just completely blanked there. I couldn’t remember what to do! I knew these lines with Bb5+ deep into them, but for a second there I didn’t know how I should get there at all, and so I just sat thinking for 5-6 minutes and my mind was just blank – there was just nothing. I saw that 7. Nxe6 loses a piece, I just at the board didn’t even consider Bb5+, even though I’d reviewed it before and knew it was the correct move. That was just total insanity."
How is this possible that a world champion, who is only 29 years old, and is known for his photographic memory, just blanks out, forgets his preparation, and can not reconstruct it over the board knowing that Bb5+ is part of the solution. Curious, right?
Carlsen, who was able to recall the areas, population numbers, flags and capitals of all the countries in the world by the age of five, won many chess history quizzes and most recently was able to identify 8 out of 9 game position from Anand (a quiz organized for Anand's 50th Birthday). How can you suddenly lose that capability at the age of 29?
Let's return to the chess variations. The move 5.Bc4 is covered in the April 2020 Hiarcs Opening Book, a book created based on engine, correspondence, and top GM games. Judging from the stated rating it has been played before between engines and the opening book suggests as the critical line (including 7.Bb5+):