Blitz shows what you know in the best way, as bullet is to fast, and blitz is just about right. However, you need to prove your strength OTB though, in classical time controls.
More skilful: bullet, blitz, or standard
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Each version requires a unique skill. Longer time controls require a skill called "thinking".
So I was wondering, which type of chess requires the most skill. Personally I think it standard takes more skill followed by blitz and then bullet. But i would like to know what evryone else thinks.