Hi Pavel - I started a new thread to skip the back and forth banter in the prior one.
If I understand correctly your response, then defensive reserves will activate if the odds are 10 to 1 or lower in favor of the defender.
This seems like an awfully low threshold for defensive reserves. Eg - basically a single rifle brigade can cause reserve activations when pitted against 2-3 divisions. Seems rather unlikely - I would think the same threshold of 4:1 that applies to the attacker would apply for the defender.
In practice, what I see is reserves reacting to pointless attacks - eg a single rifle division attacking a fortified point of 2 divisions. Said divisions and reserve shooting up all their ammo against a minimal attack (designed to do nothing more than get them to shoot all their ammo...).
Is there any sliding scale based on odds for commitment or is it just a plain check? Eg 1:10 is the threshold or is it more difficult for a unit to commit if the odds are 1:10 vs say 1:2.
Reserves are really the only defensive tool in the game to counter the inability of a defender to respond in a week long turns; so it is important that they be committed efficiently.
A further option would be to reduce the cost of reserve commitment - an infantry regiment 10 miles (1 hex) from a hex that was attacked say 8 times in a week could easily be engaged many times; but the game only really allows 2 commitments (maybe 3 if everything is perfect) in a single week from 10 miles away.
Odds estimation is just one of the factors. There are many others affecting reserve commitment - leaders rolls (initiative), HQ chain distance, range from the hex, state of the unit, etc. Also strength estimation is affected by the FOW. Usually enemy fowed CV is higher than the actual, so odd factor is really used to filter out situations when odds difference is large enough not to be affected by random factors, but still leaving some randomness.
So far I don't see reserve activation to be too excessive, but of cause there could be the cases when it goes over the top. You can always send a save with clear steps to reproduce it. We can always look at it.