Flat stake
Flat staking means risking the same amount on every bet regardless of how attractive it looks.
In plain English
It is the cleanest basis for measuring selection quality, because every result carries equal weight and a good record cannot be manufactured by sizing a few winners larger.
Example
Risking one unit on all fifty bets in a period, rather than three units on the ones that felt strongest.
Why it matters
Variable staking mixes two skills together. Flat staking isolates whether the selections themselves are any good.
How V8 uses this term
V8 reports performance on a flat-stake basis so the published record reflects selection quality and not a staking scheme.