Twenty numbered cards. An out-shuffle keeps the top card on top, an in-shuffle pushes it to second place. Count how many of each bring the deck back to 1 … 20; click a card to follow it.
Top half
Bottom half
Shuffled deck · positions 1–10 / 11–20
Twenty cards, split into two halves. Weave them together with an out-shuffle or an in-shuffle.
Shuffles: 0 (0 out, 0 in)
Click a card to track it.
On 20 cards the out-shuffle has order ord19(2) = 18 and the in-shuffle ord21(2) = 6; on 52 cards: 8 out-shuffles or 52 in-shuffles.