🧠 Thinking with Portals (Illegal Move Exercise)

**Illegal Move Exercise:** The audio will lead you through a series of moves from the beginning of a game. Somewhere in there, a player will make an illegal move but the game will continue anyway. Find the illegal move. To learn more about Don't Move Until You See It and get the free 5-day *Conceptualizing Chess Series*, head over to https://dontmoveuntilyousee.it/conceptualization **PGN for today's exercise:** 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. h3 Ne7 6. g4 Bd7 7. Bg2 c5 8. c3 Nbc6* **And the answer is...** Black's move 6... Bd7 is illegal because the e6 pawn blocks the bishop from passing back along that diagonal.