Suspect it's down to a lot of users of the website being American. I'm not American but I'm guessing their media made a big deal about Fischer so that even people with no interest in chess in America will have heard of him. Meanwhile Carlsen is Norwegian so he's only a name people will be familiar with if they play or watch chess.
Fischer was world news in many ways. He is part of history. He is known by non-chess enthusiasts, whereas Carlsen probably not as much. I'm not American and I'm not Norwegian.
What he means is that the fool's mate can also be achieved by the white side, but it takes 3 moves, as follows:
1. e3 f6
2. c3 g5
3. Qh5#
Of the 29 possible moves white can make on move 2, 6 would prevent the fool's mate option from being available (f3, g4, Nf3, Qh5+, Ke2, Be2), so c3 could be 22 other moves as well, but white's fastest possible checkmate is on move 3, after black's moves of f6 and g5.
I could understand what you meant for castling but that definition is wrong. The pieces don't switch places, if they switched places the king would end up in one of the corners of the board. Castling just moves the king 2 spaces and then the rook jumps over it in the same move.
Elo rating indicates how strong you are compared to your opponents. It is not absolute, but relative measure, because you gain or lose rating points by wins or losses. If marathon would have same rating system, you wouldn't record times but wins or losses against other runners.
World ranking is based on Elo ratings of current players. Magnus Carlsen is number 1 in that ranking. He has also achieved the highest Elo rating of all time. It means that he has succeeded among his peers better than anyone else before him (but there is also inflation among Elo ratings over time). So, both statements are true about Carlsen.
In castling, the king and rook don't switch places. The king and rook each move two places over, whereas to switch places completely both would have to move three spaces.
Great quiz! I'd love if you made some more chess-themed quizzes, maybe about top players throughout history or openings or something like that. Great start though!
Castling's clue should be something along the lines of 'Name of the move where the king and rook both move, the king going on the other side of the rook' or even 'Move that has types queenside and kingside'. Castling does not swap the rook and king's position; while the rook can end up where the king was, the king is never put in the corner where the rook was after castling.
Zugzwang was actually one of the easier ones for me I thought, but I don't follow chess history/news, so that could be why some 'easier' ones were harder for me.
I stopped reading the question after 'Z word' and spent a good 30 seconds spelling zwischenzug. If at first you don't succeed... try reading the instructions.
Garry Kasparov was World Champion for 15 years meaning the number of months he was champion for would be around 180. Emanuel Lasker was World Champion for 27 years (although that included WW1)- around 324 months.
In any case, the older quiz has now been deleted.
Also in Chinese the move is called "王车易位" (literally "king-rook transposition")
2. g4 Qh4#
You may be thinking of Scholar's Mate.
1. e3 f6
2. c3 g5
3. Qh5#
Of the 29 possible moves white can make on move 2, 6 would prevent the fool's mate option from being available (f3, g4, Nf3, Qh5+, Ke2, Be2), so c3 could be 22 other moves as well, but white's fastest possible checkmate is on move 3, after black's moves of f6 and g5.
World ranking is based on Elo ratings of current players. Magnus Carlsen is number 1 in that ranking. He has also achieved the highest Elo rating of all time. It means that he has succeeded among his peers better than anyone else before him (but there is also inflation among Elo ratings over time). So, both statements are true about Carlsen.
https://support.chess.com/article/266-how-do-i-castle
Zugzwang was actually one of the easier ones for me I thought, but I don't follow chess history/news, so that could be why some 'easier' ones were harder for me.