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[Marty R.]

Keith, is there anything on some of the wings that are strange to me, such as H, L and S?

[keith]

Marty,

No. Here is the index to wings:

[arkietech]

Simply stated a wing is a chain of 3. There are three strong links, at the beginning in the middle and at the end. Thay have names according to the pattern of whether the strong link is internal (a bivalue cell) or cell to cell (local).

XY-WING (x=y)-(y=z)-(z=x) any x that can see both ends can be eliminated.

ALS XY-WING is an xy-wing where one or more of the bivalue cells is replaced with a almost locked set (als)

W-WING (x=y)-y=y-(y=x) any x that can see both ends can be eliminated.

M-WING (x=y)-y=(y-x)=x any x that can see both ends can be eliminated.

Split wing S-WING x=y-(y=x)-x=y y may be eliminated from the beginning cell and x can be eliminated from the ending cell.

Local wing L-WING x=(x-z)=(z-y)=y y may be eliminated from the beginning cell and x can be eliminated from the ending cell.

Hybrid wing H-WING (x=y)-y=(y-z)=z x can be eliminated from the ending cell.

Hybrid wing H-WING (x=y)-(y=z)-z=z x can be eliminated from the ending cell.

XYZ-WING (x=y)-(y=xz)-(z=x) any x that can see both ends can be eliminated.

Exceptions:

X-WING is a fish pattern involving 2 rows and 2 columns.

WXYZ-WING two als's wxyz and wz one in a line the other in a box with the w's seeing each other. All other z's in both box and line that see all z's in als's can be removed.

it is the same as an ALS XZ rule with W as the restricted common

[Marty R.]

[arkietech]

I don't see an H-wing here:

[Marty R.]

Dan, you'll rue the day you posted those explanations. But if I don't ask these questions I have -0- chance of learning.

[arkietech]

1r5c9=(1-2)r7c9=(2-6)r7c6=6r5c6 => -1r5c6; stte

x=(y-z)=(z-x)=y

should be

x=(x-z)=(z-y)=y

my boo boo I will correct it Thanks.

x=1
z=2
y=6

hope this helps

[ronk]

[arkietech]

[Marty R.]

L-Wing.

[arkietech]

[Marty R.]

I thought that was too easy. Thanks, back to the drawing board.