How to effectively use quick battles (autobattles)?

I remember at a gathering in Minsk, Vasya and Alex made a bet: Alex claimed he could complete the third scenario with a Flux-based stack on week 2 with acceptable losses (I don't remember the exact criteria). They started, Alex built up with codes and leveled up Monty to level 7, bought/upgraded the necessary units, and found the desired stack. Then he said, "Well, for starters, I'll try it on quick battles, maybe the computer will handle it for me." He fought on quick battles – the losses were ridiculously small. Everyone was laughing, and Vasya paid up. Now it's clear what the trick is. I've tested this setup myself. Tactical battles still look better. I entered the third scenario with Monty at level 7 – expert offense, stats 6-4, without a book. The army consisted of 7 mages and a core of 15 archers, 10 earth elementals, and 4 harpies for distraction. On quick battles, 2 mages are killed. On tactical battles, not a single one (even if you fight without looking). It's enough to place earth and fire in the corner, and the mages slightly forward so that the stacks of griffins, which will attack the core, touch the mages; then the rest will wait or be defeated. The best result was that 7 earth elementals and 4 archers survived. This is, of course, unattainable on quick battles.