The El País expert sudoku from May 5, 2024

[@DavidShatz-hw6jl]

The 49 pairs in R4 were a clever find with 5s in blocks 4 and 7 revealed! The 1 in C7 followed and a relatively difficult solve was on its way to “fruition” as it were! I shall miss your graceful greetings - lots of happiness in your many endeavors! 💕

[@AnonimityAssured]

This had a rather tricky step, which I imagine you resolved faster and more efficiently than I did. I have yet to watch some of these last videos. Plenty of time to do so. A sad day (26 = row 2 column 6): 26, 74, 69, 28, 39, 77, 11, 88, 47 (hidden single, owing to hidden quads in row; not easy to spot), 53, 82, 79, 99, 87, 67, 57, 33, 36, 32, 61, 48, 58, 68, 16, 27, 17, 14, 24, 44, 42, 42, 62, 51, 65, 49, 59, 96, 73, 12, 71, 23, 13, 25, 15, 22, 21, 92, 86, 85, 46, 94, 56, 75, 81, 91, 45, 54.

[@pvuor]

Ah, could not see that 49 pair... this was a bust.