>>If the chance of queen loss was 15% in a single queen colony, then the 
>>chance of both queens being or going bad in a two queen one might be as 
>>low as 15% of 15% or 2.25%.  YMMV, though.

> This might be stretching--math vs field reality.  Do you have actual field 
> results, rather than mathematical theory?

Read it again.  I said *might be* and YMMV i amending my original number, 
which is prolly closer to real world since it yields a 5% to 7% loss.

In practice I do not have enough measurements to prove anything, but I do 
know that wintering loss is very low when good hives are combined by a 
knowledgeable crew or in two-queen colonies that are wintered with the 
excluder pulled -- and in my area.   I know nothing about generalities, only 
the specific cases I observed. 

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