A Haaaaaaaaaaard XV Sudoku !! 

45 minutes, I solved it on my own....I think this was the toughest XV sudoku I have faced till now

Wow! Great puzzle and fantastic solve. Learnt the diff types of reasoning in XV pairs variant. Thanks a lot!

Thankyou for solving another puzzle of mine, and a very tough one at that - I'm really glad you persisted with this one; it was a real joy to see those lightbulb moments! There are many narrow deductions here: the 16 pair, seeing that 1 is limited to r7c89 & that r7c9 doesn't work because r7c8 can ONLY be 1 or 9 (amazingly enough), the 2 in b2, and there's lots of action with 3s in r6/b4. I seem to remember there being more traction with b4 but it's been a long while since I test solved this puzzle. The Y-wing is a happy coincidence but as has been pointed out by Laszlo, 3 can only go in r8c46 (not possible in r8c1 as it would be adjacent to a 2) so you can eliminate 3 from the bottom of c5. The skyscraper was not intended at all. I like XV (-) a lot and as luck would have it, this video has come at the perfect time for a real hard practice puzzle before the WPF Sudoku GP Rd 6 where the highest pointer is an XV (-) sudoku which is well over 100 points. I will look into doing another XV (-) sudoku in the future with a few given X and V clues as there is lots of potential for nice deductions in these puzzles but hopefully it can be a bit friendlier with a few given clues.

Beautiful puzzle, extremely hard. Solved it in 50:54. I used a lot more pencilmarking, basically entering all candidates in each cell eventually, slowly eliminating possibilities. This allowed me to notice some of the deductions much easier. For example, already at 13:35, r7c8 can only be 1 or 9, which eliminates 1 from r7c9, placing 1 to r7c8. In box 8 I was able to eliminate 2 from r9c4, because a 2 there would put 3 to r8c6, 7 to r8c4 and 8 to r9c5, putting 2 and 8 next to each other (this didn't help much, though). Then I found a skyscraper on 6 in columns 3 and 8 (6 can only go to r29c3 and r39c8), eliminating 6 from r2c79 and r3c1. This restricted 6 to r3c89 in box 3, removing 4 from those cells, so now 4 could only go to r3c2 in row 3. Then I was able to eliminate 3 from r6c2, because a 3 there would place 8 to r6c5, making r6c3 either 2 or 7, neither of which can be next to a 3. This then limited 3 to r4c12 and r5c1 in box, eliminating 2 from r4c1, leaving only r6c3 for 2 in the box. After this the puzzle collapsed. At 48:09 you can already limit 3 to row 8 in box 8, so the pretty xy-wing on 238 was not actually needed :) Pity.

A very hard sudoku indeed. Thankyou author and thankyou Kishore for solving this logically and patiently. I too didn't expect a Y wing in this variant. Nice