I think we need some answers.
Yes, I think it was a payout from pool or something, because at pool statistics the value per mined block 279 was 0 (and it is correct with algorithm, because the reminder is 1.368).
Got it! Thanks for the quick replies.
Anyone can check if the algorithm works. From the blockchain we take blockHeight and diff. Example block 294 with diff 1.420. Then we divide 294 by 1.420 to get 207.0423. In order to get the reminder we need non-integer part of 207.0423 (which is 0.0423) and again multiply it by diff. So reminder is 0.0423*1.420 = 0.06
Or you could just do 294 mod 1.420 http://www.wolframalpha.com/input/?i=294++mod+1.420