3x3 Speedcubing: The Ultimate Limits Forecast

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PLL: All 21 Cases

21 cases (4 mirror pairs → 17 independent algs). Mean 12.5 STM:

Letter	Name	STM	P	Recog	Alg
H	H-perm	7	1/72	0.2s	M2 U M2 U2 M2 U M2
Z	Z-perm	9	2/72	0.3s	M2 U M2 U M' U2 M2 U2 M'
Ua	Ua-perm	11	4/72	0.4s	R U' R U R U R U' R' U' R2
Ub	Ub-perm	11	4/72	0.4s	R2 U R U R' U' R' U' R' U R'
Aa	Aa-perm	10	4/72	0.5s	x R' U R' D2 R U' R' D2 R2 x'
Ab	Ab-perm	10	4/72	0.5s	x R2 D2 R U R' D2 R U' R x'
E	E-perm	17	2/72	0.7s	x' R U' R' D R U R' D' R U R' D R U' R' D' x
F	F-perm	19	4/72	0.8s	R' U' F' R U R' U' R' F R2 U' R' U' R U R' U R
Ga	Ga-perm	15	4/72	0.9s	R2 U R' U R' U' R U' R2 U' D R' U R D'
Gb	Gb-perm	15	4/72	0.9s	R' U' R U D' R2 U R' U R U' R U' R2 D
Gc	Gc-perm	15	4/72	0.9s	R2 U' R U' R U R' U R2 U D' R U' R' D
Gd	Gd-perm	15	4/72	0.9s	R U R' U' D R2 U' R U' R' U R' U R2 D'
Ja	Ja-perm	11	4/72	0.4s	x R2 F R F' R U2 r' U r U2 x'
Jb	Jb-perm	14	4/72	0.4s	R U R' F' R U R' U' R' F R2 U' R'
Na	Na-perm	22	1/72	0.5s	R U R' U R U R' F' R U R' U' R' F R2 U' R' U2 R U' R'
Nb	Nb-perm	18	1/72	0.5s	R' U R U' R' F' U' F R U R' F R' F' R U' R
Ra	Ra-perm	16	4/72	0.6s	R U R' F' R U2 R' U2 R' F R U R U2 R' U'
Rb	Rb-perm	14	4/72	0.6s	R' U2 R U2 R' F R U R' U' R' F' R2 U'
T	T-perm	14	4/72	0.4s	R U R' U' R' F R2 U' R' U' R U R' F'
V	V-perm	14	4/72	0.6s	R' U R' U' y R' F' R2 U' R' U R' F R F
Y	Y-perm	17	4/72	0.5s	F R U' R' U' R U R' F' R U R' U' R' F R F'

4 iconic PLL previews:

T-perm

Adjacent corner + adjacent edge swap

R U R' U' R' F R2 U' R' U' R U R' F'

Ja-perm

Adjacent corner swap, no edge cycle

x R2 F R F' R U2 r' U r U2 x'

H-perm

4-fold symmetric edge swap; rarest PLL

M2 U M2 U2 M2 U M2

Y-perm

Corner diag + edge diag (Y on side)

F R U' R' U' R U R' F' R U R' U' R' F R F'

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