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Flash Anzan (mental abacus) techniques are always a notable topic[1][2].

As a sibling suggests, perhaps what you have is a Chinese abacus, which may be different in some sense; I would not know. In any case, I had assumed only decimal varieties existed and perhaps some sexagesimal configuration from antiquity.

I'd always fantasized about commissioning the builds of hexadecimal sorobans and mentally imprinting on them to the point of being able to perform immediate register math while debugging assembly for CTF challenges and the like. Maybe that could add an interesting dimension to the hobby :)

[1] Terrifyingly quick use of a soroban: https://www.youtube.com/watch?v=0_11-FZpc1c

[2] Flash Anzan/Mental abacus competition snippets: https://www.youtube.com/watch?v=mPLt1ujt5qE




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