Reduction method: centres (cross + x-centres), three-piece edges, like a 3x3. Full course with animations and simulator: strefa-kostek.pl/en/kursy
StrefaKostek.plstrefa-kostek.pl
1Move notation
RLUDFB - one outer layer, quarter turn clockwise, looking at that face. 2R = only the second layer from the right (direction as R), UwDw = two layers at once (Dw turns like D). xyz = whole-cube rotation like R, U, F. Order: centres (cross, then x-centres) → edges → like a 3x3 (outer moves only). The face colour is set by its fixed centre.
2Centre cross
Four t-centres next to the fixed centre (x-centres do not matter yet).
topfree back t-centre (U)
frontt-centre in the right t-centre spot (F)
2R U 2R'
2R' D2 2R left column of the bottom ↔ right column of the front (from the bottom to the front; only while the bottom is not solved)
3X-centres
Cross done - you insert four x-centres.
topfree front-right x-centre (U)
frontx-centre in the top-right corner (F)
2R U 2R' U 2R U2 2R'
From the bottom: x-centre in the left column of the bottom, 2R' D2 2R, then F.
4Centre order
White fixed centre on top. Another side to the front: y.
x2, yellow on top, white on the bottom. No moves from the bottom.
z: white on the left, yellow on the right - they stay on the sides. Rotations only x and y2.
Centre on top (colour of its fixed centre): from the front, from the bottom, from the back (y2).
x, the next one on top: from the front and from the bottom. Do not touch the back any more.
x, the next one only from the front - the last solves itself.
5Edges
Midge + two wings with the same colours.
Unsolved edge at the front left; the pattern = its midge.
Wing into the front-right edge: from the top U… R', from the bottom D… R, from the back R2 / B2 R2.
Front colour different from the midge? R U R' F R' F' R
Wing at the bottom: Uw' R U R' F R' F' R Uw
At the top: Dw R U R' F R' F' R Dw'
Wrong wing in the left edge: first bring any unsolved edge to the right. The right edge must not be finished.
6Last edge
Parity: both wings swapped (pattern colour - other - colour). Edge at the top front:
2R2 B2 U2 2L U2 2R' U2 2R U2 F2 2R F2 2L' B2 2R2
2L turns like L - the opposite way to 2R.
7Continue like a 3x3
Yellow on top, outer moves only (R, U, F…). No parity.
daisy → white cross
white corners: R U R' U'
second layer: U R U' R' U' F' U F / U' L' U L U F U' F'
yellow cross: F R U R' U' F'
yellow edges: R U R' U R U2 R' U
corners into place: U R U' L' U R' U' L
corner twisting: R' D' R D
!When something goes wrong
Mixed-up layers: 2R = only the second layer, Uw/Dw = two, R = only the outer one. 2L, Dw and D turn like L and D.
A piece escapes from the top: before the algorithm the back t-centre (cross) or the front-right x-centre (x-centres) must be free.
The cross breaks while doing x-centres: for x-centres only 2R U 2R' U 2R U2 2R'. Before turning an inner layer, align the others.
Letter = quarter turn clockwise, looking at that face; ' = the other way; 2 = half turn. Uw, Dw = two layers at once, 2R = only the second layer from the right (direction as R).StrefaKostek.pl