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I tried to solve Anton's challenge. It's funny, but Inteus is short 48 mana points to get Valeska. I solved everything else, including killing Kirra Silvia. I suspect I messed up somewhere with the peasants, although I thought I checked everything. I captured all the castles directly without visiting them. I placed the Grail in the Dungeon, although during the playthrough, it became clear that it should have been placed in the castle village; otherwise, the battles with constant antimorale were quite challenging. I summoned even more demons than required.
How this logistics was calculated in the days before the HD mod, I have no idea.