423
423 combines a high self-throw, a held ball, and a crossing throw in an uneven rhythm that develops control over changing throw heights.
Throw sequence
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423
423 is a 3-ball siteswap that introduces the concept of a hold — the 2 in the pattern means you just hold a ball for one beat instead of throwing it.
Breaking it down
4— medium-height self-throw (same hand catches it)2— hold: the ball in your other hand just waits3— regular cascade cross-throw
Why it matters
423 is one of the best tricks for understanding siteswap theory because the hold makes the rhythm very clear and audible.