![]() When I returned to London, I met up with Brian Butterworth, professor of cognitive neuropsychology at University College London and the author of The Mathematical Brain, and showed him some video clips of Flash Anzan. The previous winner, Priyashi Somani, from India, did too. Earlier this year the Japanese Naofumi Ogasawara won the Mental Calculation World Cup using the technique. Performing arithmetic using an imaginary abacus is the fastest way to perform mental calculations. They only retain the final answer on the imaginary abacus. At the end of the game the contestants cannot remember any of the numbers, or the intermediate sums. When they see the second number they instantly add it to the number already visualized, and so on. When the contestant sees the first number he or she instantly visualizes the number on the imaginary abacus. The result is displayed on the screen, and those who got the correct answer stand up.įlash Anzan was invented a few years ago by an abacus teacher, Yoji Miyamoto, who wanted to design a maths game that was only solvable by calculation with an imaginary abacus, a skill known as anzan. The contestants write down their answers and exchange papers for marking. The remaining contestants are sitting in chairs. Note that the format of the competition is a bit like an arithmetical version of a spelling bee. Click here to see a longer clip from 2011, showing Sasano break the world record at 1.80 seconds.
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