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It is an XY-Wing. if you highlight ZeroAssoluto's quote, there are that and a couple of other solution

I used an XY-chain to anchoured at r7c2 & r3c3 to eliminate 9 at r7c3.

Starting at r7c2 up c2, across r5, down c7, across r9, up c8, across r3 to r3c3.

Hi Greenvilleguy

That solution was in ZeroAssoluto's solutions. His solutions are hidden, but if you hold and shift in his solution box they become available. He calls a Y-wing an XY-wing but they ...

I found a finned x-wing that eliminated 8 from r3c12. Basic steps thereafter. Hope I didn't make a mistake!

I used a candidate colouring method that keys off bivalued cells though the solution is similar to dongraves. The steps I took:

- The 9s in c37 eliminate 9 in r8c9 in a finned x-wing thus creating ...

I used a colouring technique.

In r1c3, I set the 5 to Green & the 8 to Blue. As 8 is a strong link in r1 so the 8 in r1c7 is Green with the 6 being Blue. In c2 the 5 is also a strong link so in ...

Going over these old puzzles.

Went got multiple 15 Remote Pairs on this one!

Using my pen & pencil method, starting approximately where dongrave has the puzzle, I used the "3D Medusa" method. Starting with a base on Row 6, I eventually found a contradiction with ...

Excellent puzzle! Didn't solve; going to try again.

Please post more if you have any!

Not that challenging this time. I used an XY-Wing.

fx-wing -3 r4c9
xy-chain -3 r4c2, r5c8
xy-wing -5 r4c2

Several Steps:
I) X-wing removing 9s from r1c1, r9c1, r9c6
II) xy-chain with anchors at r8c2 & r9c7 removing 1s from r9c1, r8c7
III) Finned x-wing removing 1 from r5c9
IV) W-wing removing 3s f ...

A w-wing with 6s in column 5 removes 9s from r8c4 & r4c6

I used two steps:
An 246 xyz-wing removes 6 from r3c9.
An xy-chain with the ends at r9c8 & r3c9 removes 4 from r1c8

I used a chain of 8s anchored at r2c3 & r8c2 which removes 8s from r3c2 & r7c3. The later gives an 8 at r2c3 by virtue of column 3.

That led to a contradiction of 4s in box 7. That filled o ...

I used a swordfish to remove 5 from r1c4

I used a finned xwing to remove 7&8 from r8c5. Remote pairs also works.
A x-chain to remove 2 from r8c9
A xyz wing to remove 8 from r8c9

I used an xwing on 4
A UR on 3&9
and the finned xwing on 7

I used an xy-wing to eliminate 2s from r2c4, r1c7

Then an xy-chain anchored at r3c3 & r2c4 to eliminate 7 at r3c4

dongrave,

Unfortunately I have thrown away my paper & pen sheet on this puzzle. Recalling best I can from reviewing your grid, I suspect I used a skyscraper on 2s from columns 3&4 which gi ...