I've recently been trying to learn the queen vs rook and rook and bishop vs rook endgames, and I've found it interesting how close the margin of victory vs draw is. I was thinking about whether the bishop's color lock is the reason it can't win. So what if we gave the bishop its shogi promotion that allows it to additionally move like a king? Does this promoted bishop give its rook the support it needs to overcome the enemy rook?
Also, as a related question, is there a more general resource for analyzing endgames with nonstandard pieces?