You got me! It's a bug. My solution is 22 moves, but I did it the other way, where instead of d4, I did c3, moving the rooks in a circle. This solution is much faster and more consistent to perform, and I was trying to get the lowest time.
The bug is that if you go fast enough (possible to do with a mouse but much easier with a touchscreen device), the game doesn't count your moves correctly and misses a move somewhere. I am not sure where exactly the move gets skipped, but my best guess is the first queen move was not counted, because I moved the piece before the queen object was visible.
Thanks for verifying the quickest solution is 22 moves! Very cool.
