Find the Truth: Each day, you'll receive between 3 and 10 statements about Chess. The number of statements changes every game, so one round might have 3 options while the next has 8 or 10. For every day, I decide: - The number of options (3-10). - The number of true statements. - The number of false statements. - Whether your objective is to find the truth(s) or the lie(s). I'll always specify exactly what you're looking for. Difficulty System: The difficulty follows the value of the chess pieces: ♙ Pawn ♘ Knight ♗ Bishop ♖ Rook ♕ Queen ♔ King Every statement is independent. Some will be obvious, others intentionally misleading. Day #1 Difficulty: ♘ Knight Objective: Find the 1 lie. There are 7 options. 1. A player may castle even if the rook is under attack. 2. A knight can fork a king and queen at the same time. 3. An en passant capture is only legal on the move immediately after the opponent advances the pawn two squares. 4. A bishop and knight together can force checkmate against a lone king. 5. If your king is in check, you may ignore the check if you can give checkmate on the same move. 6. A queen is worth approximately nine pawns in standard chess evaluation. 7. In standard chess, White always makes the first move. Your answer should be the number of the one lie only.

Alright. Hint 1 This player became a grandmaster before turning 14, making them one of the youngest grandmasters in history at the time. Hint 2 They are known for an extremely aggressive, tactical style, and many of their games feature spectacular sacrifices. Hint 3 They defeated the reigning World Champion in a classical game while still a teenager, drawing worldwide attention. Who is the grandmaster?

Which chess skill matters most for rapid improvement?