xyz-wing:

the wing has 1 extra digit attached at the pivot cell, still functions identical to the xy-wing, construction restricts it to being a box + row/col intersection where the 3rd digit set as true is the elimination and wont chain anywhere, that way the z digit is solved in both end points and pivot as truth, anything that sees all 3 truths must be false.

a spit wing

the corrected notation:

S-Wing: (X)a = (X)b - (X=Y)c - (Y)d = (Y)e "a" and "e" in same unit; a<>Y, e<>X

but not in the same cell -- else M-Ring

it starts with a bivalve in the middle, and which has candidate X,Y

candidates X and Y go off in separate directions via strong or grouped links

x end point sees the end point of y.

that way when the bivalve solves as X or Y the end points result in : X can be x but never Y, and Y can be y but never x.

{discontinuous nice loop}

- Code: Select all
`+------------+---------+-----------------+`

| . . . | . . . | . . . |

| . A . | . . . | -B A . . |

| . . . | . . . | . -A B . |

+------------+---------+-----------------+

| . . . | . . . | . . . |

| . AB . | . . . | . B . |

| . . . | . . . | . . . |

+------------+---------+-----------------+

| . . . | . . . | . . . |

| . . . | . . . | . . . |

| . . . | . . . | . . . |

+------------+---------+-----------------+

note:

Col 7 is strong links for B { 2 spots left which are marked}

Row 2 is strong links for A { 2 spots left which are marked}