In Doraemon, there are numerous references to the number "129.3". For instance, Doraemon's official height is 129.3 centimeters, weight 129.3 kilograms, even his birthdate is set as September 3rd, 2112. His escape speed when encountering mice is said to be 129.3 km/h, among other instances. Is there any special significance behind "1293"?

Interestingly, 129.3 centimeters happens to be the average height of a fourth-grade elementary school student in Japan. Doraemon initially serialized in the manga magazine Shogaku Yonensei (Literal: Fourth Grade Student), tying into this height association.

Apart from that, Nobita isn't completely without skills. Besides his cat’s cradle, shooting, and instant sleeping abilities, he's also quite adept at chess. There was a time when Gian forced Nobita to play chess at his house, declaring that if he couldn't win, Nobita wouldn't be allowed to go home. Despite Nobita intentionally trying to lose, he couldn't manage it. Besides, it took help from others for Suneo to finally win against Nobita at a different game, called Reversi. Moreover, Nobita has defeated the local chess champion, Mr. Goda, the man whose windows were often shattered by baseballs. Most importantly, he has even won against Doraemon in chess. Considering that 20th-century AI could easily defeat chess champions and 21st-century AI could do the same in Go, it's quite impressive that Nobita can outplay a 22nd-century robot in chess.