Praggnanandhaa gave an interesting explanation about his lengthy thought. It turns out that he has played a lot of bullet games against GM Theodorou, and he has lost many of them in this exact structure.
1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. g2g3  3... f8g7  4. f1g2  4... e8g8  5. b1c3  5... d7d6 Black is in King's Indian mood. 6. g1f3  6... a7a5  7. e1g1  7... c8f5 \"Not the most common thing.\" (Praggnanandhaa) 8. f3h4  8... f5c8  9. b2b3 \"But I could not remember my theory after this move.\" (Praggnanandhaa) 9... b8d7 Therefore, a novelty $1 10. c1a3 