There's a word for 'single-member constituency' in English. Whenever you move or create them it's called Gerrymandering, and guaranteed half the seats before the vote was even called ... This isn't really fraud, for which there was so little evidence I was surprised that the bigger story of no-one coming to vote, or noting that 3/4 of russians didn't choose the party that now has a constitutional super-majority.
Because 2/3 of the eligible voters did not bother to come to the so called "vote" at all. That's how 1/4 becomes 3/4. It's not even to consider the ammount of fraud in those elections.