Make the white face on the bottom. The side colors do not need to match yet.
Goal
Put all four white corners on the bottom, white facing down. Their side colors do not need to match, so this is easier than a full layer.
How to recognize it
The first three white corners usually take just a few moves. This lesson practices the last corner, by which way its white faces.
How to hold the cube
White on the bottom. Turn U so the missing white corner is at the top front right. Turn D so the empty spot is right under it.
The main idea
If white faces right or front, it takes just 3 moves. If white faces up, it takes 7 moves to twist the corner on its way down.
Next lesson
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