I think I've seen it start blundering more when the prospects are otherwise very bleak - if the best available move (with a depth-4 search) leads to a mate, who

I think I've seen it start blundering more when the prospects are otherwise very bleak - if the best available move (with a depth-4 search) leads to a mate, who cares if you sacrifice a rook? I wonder if there was a quicker route to a mate you'd missed...