Karssen Avelar
In numbers
Years on gambling maths
11
Writing since 2015, moved to crypto casino mechanics in 2021 when provably fair systems went mainstream.
Rounds logged on Duel Crash
4,000+
Nine sessions in February 2026, testing the published return against what the engine actually paid.
Opinions and verdicts sold
Not one
Not one rating, review slot or deleted criticism has ever been paid for. Affiliate links pay the bills, disclosed on every page.
Why this site is only about Duel
Duel is unusual enough to be worth a dedicated site. It hands back the house edge on 9 of its 10 in house games, refuses welcome bonuses on principle, and then streams blackjack tables that half the internet has an opinion about. Those three things pull in completely different audiences, and this is where they meet.
I write about the maths and the spectacle with the same seriousness. The zero house edge is the most interesting product decision in crypto gambling right now. The blackjack streams are the reason anybody has heard of the place. Cover only one half and you get a worse picture of the operator.
How I check things
For the provably fair side I use a SHA256 verifier I wrote myself, because the in game fairness panels are not always clear about which seed pair produced which result. Copy the server seed hash before the round, play it, reconstruct the outcome after the seed reveals. If they match, the round was clean.
Licence details get cross checked against the Anjouan Gaming public register rather than copied from another review. Testing runs on dedicated wallets, never a personal main wallet, with the deposit hash, the round list and the withdrawal hash logged and time stamped.
What I will not do
- No paid placements. No operator has paid for a rating, a review slot, or the removal of a criticism. The affiliate link stays where it is when a verdict moves against the casino.
- No hidden losing sessions. The figures behind these pages include losses. Anything else is a stacked dataset.
- No numbers without provenance. Every figure traces to a source, a trust file entry or a session log I will share on request. A number without a source is a bug, report it.
- No guest list built on rumour. Half the names attached to the Duel blackjack tables are lookalikes or parody accounts. If a person is named here, there is footage.
Positions I hold
- Rakeback beats a welcome bonus for anyone who plays with regularity. 80% of the house edge back with nothing to clear is real money. A matched deposit behind a 35x requirement is a workload.
- A 100% return is fair, not safe. Fair maths means break even over a long run, not profit, and the number only holds inside the caps: $50,000 of wagering a day and $1,000 per bet.
- Absurd works, offensive does not. The Duel sessions that travelled furthest were the ridiculous ones. The session that reached for shock is the only thing on this site I would tell the operator to pull.
| Years writing about gambling maths | 11, starting 2015 |
|---|---|
| Crypto casino mechanics since | 2021 |
| Education | Higher technical education |
| Languages | English and Spanish working, Portuguese and Russian reading |
| What I am not | Not a financial advisor, not a regulator, not a lawyer, and not connected to any operator |
Where to start
RakebackThere is no Duel Casino bonus and there is no promo code. What you get instead is a share of the house edge back on every bet, with nothing to clear.Read more
OriginalsAll ten Duel Casino original games and what each returns. Nine pay back 100%, Beef is the exception at 99.2%, and the daily caps are stated in full.Read more
Duel Blackjack XXXNuns, ostriches and one night that went too far. What Duel Casino blackjack XXX actually is, how the format works and who has sat down at the table.Read more