In a second updated review post on KrazyDad v.4, b.8, n.5 , Andrew Stuart’s Sudokuwiki solver gets the clue that the ALS boomerang left unresolved, and finishes the solution, with more instructive moves. You get a shot at that unusual clue.
Here is the 9-panel when KD 485’s ALS boomer discovers that 9r2c2 and 9r2c9 are a toxic set. It looks unpromising, until you take the toxic set into account. Do that for yourself, then enjoy the parade of Sudokuwiki moves in the updated post. There’s a BARN, an unaligned APE, and classic 263-wing.
A particularly impressive move is this ALS aided confirming ANL promoting 9r5c4. For you or me, it could have started as a possible boomerang, leaving 9r5c4 in search of a wink back into 1 to eliminate that 1. But since the cell is a bv, it also puts two slinks around 9. Actually it’s the same result, whether you list it as a confirming or eliminating ANL. With another candidate in the starting cell, it would be only eliminating.
When the solver invokes coloring for a single trap on 3r4c3, we expand the cluster as far as it will go, in pursuit of a possible wrap. The 363-wing and Wr6 boxline elimination are reported on the same grid. The wrap is not long in coming.
The next update report is on KD Insane 495, already up.