Now I'm really confused about cooling wort

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Sounds interesting, but you are adding water of an undetermined amount. How does that affect your OG? Well I know how, it will lower it. So how do you calculate so you reached the desired OG?
 
All amounts are fully determined beforehand and inputted into Brewer's Friend to estimate the OG.

The ice blocks are 900ml each. The target final boil volume is achieved with finessing (up the heat to reduce/top-up water to increase). Put together, I can reach the exact target batch volume. The amount of fermentables used is based on the target final batch volume and the OG I want. So far, I'm always +/-0.001 points from the expected OG.
 
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