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	<id>https://www.speedsolving.com/wiki/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=Villyer</id>
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	<updated>2026-10-29T04:18:54Z</updated>
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	<entry>
		<id>https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24011</id>
		<title>OL4C</title>
		<link rel="alternate" type="text/html" href="https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24011"/>
		<updated>2014-06-19T22:06:14Z</updated>

		<summary type="html">&lt;p&gt;Villyer: /* OLL 23 */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&#039;&#039;&#039;O&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;4&#039;&#039;&#039; &#039;&#039;&#039;c&#039;&#039;&#039;orners (OL4C), or just &#039;&#039;&#039;o&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;c&#039;&#039;&#039;orners (OLC), is a last layer step in [[ZZ-reduction]] following [[Phasing]] that orients corners while preserving edge permutation (2 opposite edges or all 4). This results in a limited [[PLL]] set of 9 cases, down from 21 in full PLL.&lt;br /&gt;
&lt;br /&gt;
== OL4C Algorithms ==&lt;br /&gt;
Of the 7 OLLs in ZZ, 4 do not commonly preserve edge permutation (Sune, Antisune, Pi, Double-Sune). The other 3 commonly preserve edges (Headlights, Chameleon, Triple-Sune).&lt;br /&gt;
&lt;br /&gt;
=== OL4C 1 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o27.gif&lt;br /&gt;
|name=S, Sune, Swimming Left&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
{{Alg|y2 R&#039; U L U&#039; R U L&#039;}}&lt;br /&gt;
{{Alg|U R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 2 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o26.gif&lt;br /&gt;
|name=-S, Antisune, Swimming Right&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L&#039; U R U&#039; L U R&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 3 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o21.gif&lt;br /&gt;
|name=H, Double Sune, Flip, Cross&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]], ? [[STM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y F (R U R&#039; U&#039;)3 F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 4 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o22.gif&lt;br /&gt;
|name=pi, Bruno, wheel, T-shirt&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|f (R U R&#039; U&#039;) F f&#039; (R U R&#039; U&#039;) F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OLL 23 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o23.gif&lt;br /&gt;
|name=U, [[Headlights]], Superman&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=9 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L2 D L&#039; U2 L D&#039; L&#039; U2 L&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F2 R U2 R U2 R&#039; F2 R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R2 D R&#039; U2 R D&#039; R&#039; U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|R2&#039; D&#039; R U2 R&#039; D R U2 R|OLL}}&lt;br /&gt;
{{Alg|R2 D R&#039; U2&#039; R D&#039; R&#039; U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|F R U&#039; R&#039; U R U R&#039; U R U&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(R&#039; U&#039; R U&#039;) R&#039; U2 R2 U (R&#039; U R U2 R&#039;)|OLL}}&lt;br /&gt;
{{Alg|l2 U&#039; R D2 R&#039; U R D2 R|OLL}}&lt;br /&gt;
{{Alg|l2&#039; U&#039; z&#039; U R2 U&#039; L U R2 z&#039; R|OLL}}&lt;br /&gt;
{{Alg|R2&#039; B2 R F2&#039; R&#039; B2 R F2&#039; R|OLL}}&lt;br /&gt;
{{Alg|(x) R&#039; B2&#039; (R U&#039; R&#039; U) B2&#039; (U&#039; R U)|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 24 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o24.gif&lt;br /&gt;
|name=T, chameleon, shark, Hammerhead, Little Horse, stingray&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; L&#039; U R U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; r&#039; F R F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039; x&#039;) R U R&#039; D R U&#039; R&#039; D&#039; |OLL}}&lt;br /&gt;
{{Alg|(y&#039;) F R U R&#039; U&#039; R U&#039; R&#039; U&#039; R U R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D&#039; R&#039; U R D R&#039; U&#039; R x&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D L U&#039; L&#039; D&#039; L U L&#039; x&#039; |OLL}}&lt;br /&gt;
{{Alg|(y x&#039;) U&#039; R&#039; D R U R&#039; D&#039; R x|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; L F R F&#039; L&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; r U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) l&#039; U&#039; L U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) l U l&#039; F R B&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 25 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o25.gif&lt;br /&gt;
|name=L, Bowtie, Triple-Sune, Side-winder, Diagonals, Spaceship&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;) (R U R&#039; U&#039;) R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|R U R&#039; U (R U&#039; R&#039; U) (R U&#039; R&#039; U) R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 R&#039; F R B&#039; R&#039; F&#039; R B|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; L F R F&#039; L&#039;|OLL}}&lt;br /&gt;
{{Alg|y F&#039; L F R&#039; F&#039; L&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; x U R&#039; U&#039; L U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|R&#039; F&#039; L&#039; F R F&#039; L F|OLL}}&lt;br /&gt;
{{Alg|y2 R U2&#039; R D R&#039; U2 R D&#039; R2&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; r U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 l&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x&#039; L&#039; U&#039; R&#039; U L U&#039; R U|OLL}}&lt;br /&gt;
{{Alg|x&#039; D R U R&#039; D&#039; R U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; U L&#039; U&#039; R U L U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; R&#039; D R U&#039; R&#039; D&#039; R U x|OLL}}&lt;br /&gt;
{{Alg|x R&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x L  U&#039; L&#039; D  L  U  L&#039; D&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|l&#039; U&#039; L&#039; U R U&#039; L U x&#039;|OLL}}&lt;br /&gt;
{{Alg|U r U R U&#039; L&#039; U R&#039; U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;)2 R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 L&#039; R U R&#039; U&#039; L U R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|F R B R&#039; F&#039; l U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|U R U2 R&#039; L&#039; U&#039; L U&#039; R U&#039; R&#039; L&#039; U2 L|OLL}}&lt;br /&gt;
{{Alg|y R U R&#039; U&#039; R&#039; F R U R U&#039; R&#039; F&#039;|OLL}}&lt;/div&gt;</summary>
		<author><name>Villyer</name></author>
	</entry>
	<entry>
		<id>https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24010</id>
		<title>OL4C</title>
		<link rel="alternate" type="text/html" href="https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24010"/>
		<updated>2014-06-19T21:53:09Z</updated>

		<summary type="html">&lt;p&gt;Villyer: /* OLL 24 */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&#039;&#039;&#039;O&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;4&#039;&#039;&#039; &#039;&#039;&#039;c&#039;&#039;&#039;orners (OL4C), or just &#039;&#039;&#039;o&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;c&#039;&#039;&#039;orners (OLC), is a last layer step in [[ZZ-reduction]] following [[Phasing]] that orients corners while preserving edge permutation (2 opposite edges or all 4). This results in a limited [[PLL]] set of 9 cases, down from 21 in full PLL.&lt;br /&gt;
&lt;br /&gt;
== OL4C Algorithms ==&lt;br /&gt;
Of the 7 OLLs in ZZ, 4 do not commonly preserve edge permutation (Sune, Antisune, Pi, Double-Sune). The other 3 commonly preserve edges (Headlights, Chameleon, Triple-Sune).&lt;br /&gt;
&lt;br /&gt;
=== OL4C 1 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o27.gif&lt;br /&gt;
|name=S, Sune, Swimming Left&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
{{Alg|y2 R&#039; U L U&#039; R U L&#039;}}&lt;br /&gt;
{{Alg|U R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 2 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o26.gif&lt;br /&gt;
|name=-S, Antisune, Swimming Right&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L&#039; U R U&#039; L U R&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 3 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o21.gif&lt;br /&gt;
|name=H, Double Sune, Flip, Cross&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]], ? [[STM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y F (R U R&#039; U&#039;)3 F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 4 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o22.gif&lt;br /&gt;
|name=pi, Bruno, wheel, T-shirt&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|f (R U R&#039; U&#039;) F f&#039; (R U R&#039; U&#039;) F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OLL 23 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o23.gif&lt;br /&gt;
|name=U, [[Headlights]], Superman&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=9 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L2 D L&#039; U2 L D&#039; L&#039; U2 L&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F2 R U2 R U2 R&#039; F2 R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R2 D R&#039; U2 R D&#039; R&#039; U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|R2&#039; D&#039; R U2 R&#039; D R U2 R|OLL}}&lt;br /&gt;
{{Alg|R&#039; U2 R F U&#039; R&#039; U&#039; R U F&#039;|OLL}}&lt;br /&gt;
{{Alg|F R U&#039; R&#039; U R U R&#039; U R U&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) R U R&#039; U&#039; (R U&#039; R&#039; U2) (R U&#039; R&#039; U2) R U R&#039;|OLL}}&lt;br /&gt;
{{Alg|(R&#039; U&#039; R U&#039;) R&#039; U2 R2 U (R&#039; U R U2 R&#039;)|OLL}}&lt;br /&gt;
{{Alg|R&#039; U L&#039; U R U&#039; L U2 R&#039; U R|OLL}}&lt;br /&gt;
{{Alg|l2 U&#039; R D2 R&#039; U R D2 R|OLL}}&lt;br /&gt;
{{Alg|l2&#039; U&#039; z&#039; U R2 U&#039; L U R2 z&#039; L|OLL}}&lt;br /&gt;
{{Alg|R2&#039; B2 R F2&#039; R&#039; B2 R F2&#039; R|OLL}}&lt;br /&gt;
{{Alg|R d&#039; R&#039; U R d R&#039; (y) R&#039; U2 R|OLL}}&lt;br /&gt;
{{Alg|(x) R&#039; B2&#039; (R U&#039; R&#039; U) B2&#039; (U&#039; R U)|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 24 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o24.gif&lt;br /&gt;
|name=T, chameleon, shark, Hammerhead, Little Horse, stingray&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; L&#039; U R U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; r&#039; F R F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039; x&#039;) R U R&#039; D R U&#039; R&#039; D&#039; |OLL}}&lt;br /&gt;
{{Alg|(y&#039;) F R U R&#039; U&#039; R U&#039; R&#039; U&#039; R U R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D&#039; R&#039; U R D R&#039; U&#039; R x&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D L U&#039; L&#039; D&#039; L U L&#039; x&#039; |OLL}}&lt;br /&gt;
{{Alg|(y x&#039;) U&#039; R&#039; D R U R&#039; D&#039; R x|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; L F R F&#039; L&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; r U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) l&#039; U&#039; L U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) l U l&#039; F R B&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 25 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o25.gif&lt;br /&gt;
|name=L, Bowtie, Triple-Sune, Side-winder, Diagonals, Spaceship&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;) (R U R&#039; U&#039;) R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|R U R&#039; U (R U&#039; R&#039; U) (R U&#039; R&#039; U) R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 R&#039; F R B&#039; R&#039; F&#039; R B|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; L F R F&#039; L&#039;|OLL}}&lt;br /&gt;
{{Alg|y F&#039; L F R&#039; F&#039; L&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; x U R&#039; U&#039; L U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|R&#039; F&#039; L&#039; F R F&#039; L F|OLL}}&lt;br /&gt;
{{Alg|y2 R U2&#039; R D R&#039; U2 R D&#039; R2&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; r U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 l&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x&#039; L&#039; U&#039; R&#039; U L U&#039; R U|OLL}}&lt;br /&gt;
{{Alg|x&#039; D R U R&#039; D&#039; R U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; U L&#039; U&#039; R U L U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; R&#039; D R U&#039; R&#039; D&#039; R U x|OLL}}&lt;br /&gt;
{{Alg|x R&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x L  U&#039; L&#039; D  L  U  L&#039; D&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|l&#039; U&#039; L&#039; U R U&#039; L U x&#039;|OLL}}&lt;br /&gt;
{{Alg|U r U R U&#039; L&#039; U R&#039; U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;)2 R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 L&#039; R U R&#039; U&#039; L U R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|F R B R&#039; F&#039; l U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|U R U2 R&#039; L&#039; U&#039; L U&#039; R U&#039; R&#039; L&#039; U2 L|OLL}}&lt;br /&gt;
{{Alg|y R U R&#039; U&#039; R&#039; F R U R U&#039; R&#039; F&#039;|OLL}}&lt;/div&gt;</summary>
		<author><name>Villyer</name></author>
	</entry>
	<entry>
		<id>https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24008</id>
		<title>OL4C</title>
		<link rel="alternate" type="text/html" href="https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24008"/>
		<updated>2014-06-19T06:02:44Z</updated>

		<summary type="html">&lt;p&gt;Villyer: /* OLL 25 */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&#039;&#039;&#039;O&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;4&#039;&#039;&#039; &#039;&#039;&#039;c&#039;&#039;&#039;orners (OL4C), or just &#039;&#039;&#039;o&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;c&#039;&#039;&#039;orners (OLC), is a last layer step in [[ZZ-reduction]] following [[Phasing]] that orients corners while preserving edge permutation (2 opposite edges or all 4). This results in a limited [[PLL]] set of 9 cases, down from 21 in full PLL.&lt;br /&gt;
&lt;br /&gt;
== OL4C Algorithms ==&lt;br /&gt;
Of the 7 OLLs in ZZ, 4 do not commonly preserve edge permutation (Sune, Antisune, Pi, Double-Sune). The other 3 commonly preserve edges (Headlights, Chameleon, Triple-Sune).&lt;br /&gt;
&lt;br /&gt;
=== OL4C 1 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o27.gif&lt;br /&gt;
|name=S, Sune, Swimming Left&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
{{Alg|y2 R&#039; U L U&#039; R U L&#039;}}&lt;br /&gt;
{{Alg|U R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 2 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o26.gif&lt;br /&gt;
|name=-S, Antisune, Swimming Right&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L&#039; U R U&#039; L U R&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 3 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o21.gif&lt;br /&gt;
|name=H, Double Sune, Flip, Cross&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]], ? [[STM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y F (R U R&#039; U&#039;)3 F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 4 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o22.gif&lt;br /&gt;
|name=pi, Bruno, wheel, T-shirt&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|f (R U R&#039; U&#039;) F f&#039; (R U R&#039; U&#039;) F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OLL 23 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o23.gif&lt;br /&gt;
|name=U, [[Headlights]], Superman&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=9 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L2 D L&#039; U2 L D&#039; L&#039; U2 L&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F2 R U2 R U2 R&#039; F2 R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R2 D R&#039; U2 R D&#039; R&#039; U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|R2&#039; D&#039; R U2 R&#039; D R U2 R|OLL}}&lt;br /&gt;
{{Alg|R&#039; U2 R F U&#039; R&#039; U&#039; R U F&#039;|OLL}}&lt;br /&gt;
{{Alg|F R U&#039; R&#039; U R U R&#039; U R U&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) R U R&#039; U&#039; (R U&#039; R&#039; U2) (R U&#039; R&#039; U2) R U R&#039;|OLL}}&lt;br /&gt;
{{Alg|(R&#039; U&#039; R U&#039;) R&#039; U2 R2 U (R&#039; U R U2 R&#039;)|OLL}}&lt;br /&gt;
{{Alg|R&#039; U L&#039; U R U&#039; L U2 R&#039; U R|OLL}}&lt;br /&gt;
{{Alg|l2 U&#039; R D2 R&#039; U R D2 R|OLL}}&lt;br /&gt;
{{Alg|l2&#039; U&#039; z&#039; U R2 U&#039; L U R2 z&#039; L|OLL}}&lt;br /&gt;
{{Alg|R2&#039; B2 R F2&#039; R&#039; B2 R F2&#039; R|OLL}}&lt;br /&gt;
{{Alg|R d&#039; R&#039; U R d R&#039; (y) R&#039; U2 R|OLL}}&lt;br /&gt;
{{Alg|(x) R&#039; B2&#039; (R U&#039; R&#039; U) B2&#039; (U&#039; R U)|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 24 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o24.gif&lt;br /&gt;
|name=T, chameleon, shark, Hammerhead, Little Horse, stingray&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; R&#039; F R F&#039;}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; L&#039; U R U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; r&#039; F R F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039; x&#039;) R U R&#039; D R U&#039; R&#039; D&#039; |OLL}}&lt;br /&gt;
{{Alg|(y&#039;) F R U R&#039; U&#039; R U&#039; R&#039; U&#039; R U R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) R U&#039; R&#039; (U2 R U R&#039;) (U2 R U R&#039;) (U R U&#039; R&#039;)|OLL}}&lt;br /&gt;
{{Alg|(y x) D&#039; R&#039; U R D R&#039; U&#039; R x&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D L U&#039; L&#039; D&#039; L U L&#039; x&#039; |OLL}}&lt;br /&gt;
{{Alg|(y x&#039;) U&#039; R&#039; D R U R&#039; D&#039; R x|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; L F R F&#039; L&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; r U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) l&#039; U&#039; L U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) l U l&#039; F R B&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 25 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o25.gif&lt;br /&gt;
|name=L, Bowtie, Triple-Sune, Side-winder, Diagonals, Spaceship&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;) (R U R&#039; U&#039;) R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|R U R&#039; U (R U&#039; R&#039; U) (R U&#039; R&#039; U) R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 R&#039; F R B&#039; R&#039; F&#039; R B|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; L F R F&#039; L&#039;|OLL}}&lt;br /&gt;
{{Alg|y F&#039; L F R&#039; F&#039; L&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; x U R&#039; U&#039; L U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|R&#039; F&#039; L&#039; F R F&#039; L F|OLL}}&lt;br /&gt;
{{Alg|y2 R U2&#039; R D R&#039; U2 R D&#039; R2&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; r U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 l&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x&#039; L&#039; U&#039; R&#039; U L U&#039; R U|OLL}}&lt;br /&gt;
{{Alg|x&#039; D R U R&#039; D&#039; R U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; U L&#039; U&#039; R U L U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; R&#039; D R U&#039; R&#039; D&#039; R U x|OLL}}&lt;br /&gt;
{{Alg|x R&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x L  U&#039; L&#039; D  L  U  L&#039; D&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|l&#039; U&#039; L&#039; U R U&#039; L U x&#039;|OLL}}&lt;br /&gt;
{{Alg|U r U R U&#039; L&#039; U R&#039; U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;)2 R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 L&#039; R U R&#039; U&#039; L U R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|F R B R&#039; F&#039; l U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|U R U2 R&#039; L&#039; U&#039; L U&#039; R U&#039; R&#039; L&#039; U2 L|OLL}}&lt;br /&gt;
{{Alg|y R U R&#039; U&#039; R&#039; F R U R U&#039; R&#039; F&#039;|OLL}}&lt;/div&gt;</summary>
		<author><name>Villyer</name></author>
	</entry>
	<entry>
		<id>https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24007</id>
		<title>OL4C</title>
		<link rel="alternate" type="text/html" href="https://www.speedsolving.com/wiki/index.php?title=OL4C&amp;diff=24007"/>
		<updated>2014-06-19T05:51:56Z</updated>

		<summary type="html">&lt;p&gt;Villyer: /* OLL 25 */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&#039;&#039;&#039;O&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;4&#039;&#039;&#039; &#039;&#039;&#039;c&#039;&#039;&#039;orners (OL4C), or just &#039;&#039;&#039;o&#039;&#039;&#039;rient &#039;&#039;&#039;l&#039;&#039;&#039;ast &#039;&#039;&#039;c&#039;&#039;&#039;orners (OLC), is a last layer step in [[ZZ-reduction]] following [[Phasing]] that orients corners while preserving edge permutation (2 opposite edges or all 4). This results in a limited [[PLL]] set of 9 cases, down from 21 in full PLL.&lt;br /&gt;
&lt;br /&gt;
== OL4C Algorithms ==&lt;br /&gt;
Of the 7 OLLs in ZZ, 4 do not commonly preserve edge permutation (Sune, Antisune, Pi, Double-Sune). The other 3 commonly preserve edges (Headlights, Chameleon, Triple-Sune).&lt;br /&gt;
&lt;br /&gt;
=== OL4C 1 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o27.gif&lt;br /&gt;
|name=S, Sune, Swimming Left&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
{{Alg|y2 R&#039; U L U&#039; R U L&#039;}}&lt;br /&gt;
{{Alg|U R U&#039; L&#039; U R&#039; U&#039; L}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 2 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o26.gif&lt;br /&gt;
|name=-S, Antisune, Swimming Right&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L&#039; U R U&#039; L U R&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 3 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o21.gif&lt;br /&gt;
|name=H, Double Sune, Flip, Cross&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]], ? [[STM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y F (R U R&#039; U&#039;)3 F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OL4C 4 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o22.gif&lt;br /&gt;
|name=pi, Bruno, wheel, T-shirt&lt;br /&gt;
|methods=[[ZZ-reduction]]&lt;br /&gt;
|optimal=? [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|f (R U R&#039; U&#039;) F f&#039; (R U R&#039; U&#039;) F&#039;}}&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
=== OLL 23 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o23.gif&lt;br /&gt;
|name=U, [[Headlights]], Superman&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=9 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|L2 D L&#039; U2 L D&#039; L&#039; U2 L&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F2 R U2 R U2 R&#039; F2 R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|(y2) R2 D R&#039; U2 R D&#039; R&#039; U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|R2&#039; D&#039; R U2 R&#039; D R U2 R|OLL}}&lt;br /&gt;
{{Alg|R&#039; U2 R F U&#039; R&#039; U&#039; R U F&#039;|OLL}}&lt;br /&gt;
{{Alg|F R U&#039; R&#039; U R U R&#039; U R U&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) R U R&#039; U&#039; (R U&#039; R&#039; U2) (R U&#039; R&#039; U2) R U R&#039;|OLL}}&lt;br /&gt;
{{Alg|(R&#039; U&#039; R U&#039;) R&#039; U2 R2 U (R&#039; U R U2 R&#039;)|OLL}}&lt;br /&gt;
{{Alg|R&#039; U L&#039; U R U&#039; L U2 R&#039; U R|OLL}}&lt;br /&gt;
{{Alg|l2 U&#039; R D2 R&#039; U R D2 R|OLL}}&lt;br /&gt;
{{Alg|l2&#039; U&#039; z&#039; U R2 U&#039; L U R2 z&#039; L|OLL}}&lt;br /&gt;
{{Alg|R2&#039; B2 R F2&#039; R&#039; B2 R F2&#039; R|OLL}}&lt;br /&gt;
{{Alg|R d&#039; R&#039; U R d R&#039; (y) R&#039; U2 R|OLL}}&lt;br /&gt;
{{Alg|(x) R&#039; B2&#039; (R U&#039; R&#039; U) B2&#039; (U&#039; R U)|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 24 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o24.gif&lt;br /&gt;
|name=T, chameleon, shark, Hammerhead, Little Horse, stingray&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; R&#039; F R F&#039;}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; L&#039; U R U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|r U R&#039; U&#039; r&#039; F R F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039; x&#039;) R U R&#039; D R U&#039; R&#039; D&#039; |OLL}}&lt;br /&gt;
{{Alg|(y&#039;) F R U R&#039; U&#039; R U&#039; R&#039; U&#039; R U R&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) R U&#039; R&#039; (U2 R U R&#039;) (U2 R U R&#039;) (U R U&#039; R&#039;)|OLL}}&lt;br /&gt;
{{Alg|(y x) D&#039; R&#039; U R D R&#039; U&#039; R x&#039;|OLL}}&lt;br /&gt;
{{Alg|(y x) D L U&#039; L&#039; D&#039; L U L&#039; x&#039; |OLL}}&lt;br /&gt;
{{Alg|(y x&#039;) U&#039; R&#039; D R U R&#039; D&#039; R x|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; L F R F&#039; L&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) R&#039; F&#039; r U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y2) l&#039; U&#039; L U R U&#039; r&#039; F|OLL}}&lt;br /&gt;
{{Alg|(y&#039;) l U l&#039; F R B&#039; R&#039; F&#039;|OLL}}&lt;br /&gt;
&lt;br /&gt;
=== OLL 25 ===&lt;br /&gt;
{{case&lt;br /&gt;
|image=o25.gif&lt;br /&gt;
|name=L, Bowtie, Triple-Sune, Side-winder, Diagonals, Spaceship&lt;br /&gt;
|methods=[[OCLL]], [[OLL]]&lt;br /&gt;
|optimal=8 [[HTM]]&lt;br /&gt;
|text=&lt;br /&gt;
}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;) (R U R&#039; U&#039;) R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|R U R&#039; U (R U&#039; R&#039; U) (R U&#039; R&#039; U) R U2 R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 R&#039; F R B&#039; R&#039; F&#039; R B|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; L F R F&#039; L&#039;|OLL}}&lt;br /&gt;
{{Alg|y F&#039; L F R&#039; F&#039; L&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; F&#039; r U R&#039; U&#039; r&#039; F R|OLL}}&lt;br /&gt;
{{Alg|y&#039; x U R&#039; U&#039; L U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|R&#039; F&#039; L&#039; F R F&#039; L F|OLL}}&lt;br /&gt;
{{Alg|y2 R U2&#039; R D R&#039; U2 R D&#039; R2&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 F R&#039; F&#039; r U R U&#039; r&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 l&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x&#039; L&#039; U&#039; R&#039; U L U&#039; R U|OLL}}&lt;br /&gt;
{{Alg|x&#039; D R U R&#039; D&#039; R U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; U L&#039; U&#039; R U L U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|x&#039; R&#039; D R U&#039; R&#039; D&#039; R U x|OLL}}&lt;br /&gt;
{{Alg|x R&#039; U R D&#039; R&#039; U&#039; R D x&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 x L  U&#039; L&#039; D  L  U  L&#039; D&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|l&#039; U&#039; L&#039; U R U&#039; L U x&#039;|OLL}}&lt;br /&gt;
{{Alg|U r U R U&#039; L&#039; U R&#039; U&#039; x&#039;|OLL}}&lt;br /&gt;
{{Alg|R U2 R&#039; U&#039; (R U R&#039; U&#039;)2 R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|y2 L&#039; R U R&#039; U&#039; L U R U&#039; R&#039;|OLL}}&lt;br /&gt;
{{Alg|F R B R&#039; F&#039; l U&#039; l&#039;|OLL}}&lt;br /&gt;
{{Alg|U R U2 R&#039; L&#039; U&#039; L U&#039; R U&#039; R&#039; L&#039; U2 L|OLL}}&lt;br /&gt;
{{Alg|F R U&#039; R&#039; U&#039; R U2  R&#039; U&#039; F&#039;|OLL}}&lt;br /&gt;
{{Alg|y R U R&#039; U&#039; R&#039; F R U R U&#039; R&#039; F&#039;|OLL}}&lt;/div&gt;</summary>
		<author><name>Villyer</name></author>
	</entry>
</feed>