premine was from block 1 to 10152 = 800005.57758001
from 1 to 10001 block reward was 100 = 1000100 coins
from 10002 to 10152 block reward was 10 = 1500 coin
im not sure about my math but total should be 1001600 coins but on explorer it shows 800005.57758001 coin

Hmm I checked the source but found no obvious exploit, when you look here:
http://blocks.luckyalt.com:3011/richlistand especially:
http://blocks.luckyalt.com:3011/address/BRg7XA7SE7GGw7AfJ5P5ef8DYda3qgF36ayou get the amount i've calculated manually, but Abe (my explorer) reports it as claimed from the Dev:
http://blocks.suprnova.cc:2751/chain/X13PosChainIt
could be that some POS Blocks kicked in and thats why actual supply is lower than calculated but i'm not sure, I never saw a premine mined in 10.000 blocks a 100 coins .
I've asked earlz for help, we'll see what he says hopefully soon.