PDQF Method

 PDQF method Information about the method Proposer(s): Rowan Fortier Proposed: 2020 Alt Names: Variants: PDQF2, PDQF3 No. Steps: 4 No. Algs: 70 Avg Moves: Speed: 50? Purpose(s):

PDQF, or Pseudo Domino Quadrangular Francisco, is an experimental method created in December 2019 by Rowan Fortier. It was completely forgotten about, until it was rediscovered, and then fully developed in August of 2020. PDQF is primarily based on Domino Reduction, the Belt Method, and a little bit of Quadrangular Francisco.

Steps

1. EOEdge (EOLine but with the BL & FL edges)

2. Separation + Domino Reduction

2a. Make a pseudo1x2x3 rectangle on the D face with the D color. Put this rectangle under the EoEdge

2b. Make a pseudo square in the back left (like a cross edge + F2L pair, but pseudo)

2c. Make a pseudo F2L pair and use Winter Variation to insert the pair while orienting the U layer corners. At this point, the D and U colours should be on separate sides

3. Use PLLP, PLL algorithms with parity, to solve the top layer. Then do an x2 or z2 rotation

4. Use PLL to finish solving the cube

Statistics

70 algorithms. 27 Winter Variation, 22 PLLP, & 21 PLL

Average movecount should be around 50-55, but more like <60 for humans

Pros

• Fewer algorithms than CFOP
• After EOEdge, the solve only needs <RUF> & <MU> moves to solve the cube
• You can predict PLL while building the pseudo1x2x3 rectangle
• PLLP can have just as good recognition as PLL

Cons

• x2 or z2 rotation takes a lot of time
• Having 3 algorithmic steps in a row (WV, PLLP, PLL) can be tiring
• Pseudo1x2x3 rectangle uses D moves a lot and has bad lookahead
• PLLP algorithms are worse than PLL algorithms

Example Solves

Example Solve:

B2 D B2 L2 D2 R2 U2 B2 U F2 U' B L2 R2 D2 R' U' R' U' L' (White top, green front)

EOEdge: R2 L F L’ F2

Pseudo1x2x3: R U R’ D M’ U2 M D2

Square: U R U’ R’ U’ R

Pair: U R U2 R’ U

WV: R U R2 U’ R2 U’ R2 U2 R

PLLP: U’ R U' F U' R' U' R U F' M2 U2 M2 R' x2

PLL: U2 R U R’ U’ R’ F R2 U’ R’ U’ R U R’ F’ D

Moves: 63

Example Solve 2:

D2 L2 D' R2 U B2 U2 L2 B2 R2 D L' B2 U' R2 U2 B R2 U2 R' F2 (White top, green front)

EOEdge: R’ F2 U2 B’ L’ B2

Pseudo1x2x3: D U R2 D U R2 D

Square: U2 R2 U2 R

(Pair skip)

WV: R U’ R’ U R U’ R’ U R U2 R’

PLL: M2 U’ M2 U2 M2 U’ M2 U x2

PLL: (r D r’ U2)*5

Moves: 56

Variants

PDQF2:

1. EOEdge (EOLine but with the BL & FL edges)

2. Separation + Domino Reduction

2a. Make a pseudo1x2x3 rectangle on the D face with the D color. Put this rectangle under the EoEdge

2b. Make a pseudo right block

3. Use COLL to solve the corners

4. Use EPLLP (EPLL+EPLL algs with parity) to solve the top layer. Then do a x2 or z2 rotation

5. Use PLL to solve the cube

PDQF3:

1. EOEdge (EOLine but with the BL & FL edges)

2. Separation + Domino Reduction

2a. Make a pseudo1x2x3 rectangle on the D face with the D color. Put this rectangle under the EoEdge

2b. Make a pseudo square in the back left (like a cross edge + F2L pair, but pseudo)

2c. Make a pseudo F2L pair and use Winter Variation to insert the pair while orienting the U layer corners. At this point, the D and U colours should be on separate sides

3. Use CP algorithms (not generated yet) to permute the corners on both layers

4. Use L8E algorithms to permute the edges on both sides

Improvements

• Adjust the D face before doing a PLLP algorithm to influence which PLL you will get