Duel Blackjack Live 3:2 Payouts, 60% Rakeback & the Wildest Streams

Robert Dellafave is an expert sports bettor, professional gambler, and advocate for the fair treatment of sports bettors. Next, the dealer receives a second card, and the dealer receives an upcard. Live dealer blackjack is available in Connecticut, Michigan, New Jersey, Pennsylvania, Rhode Island, and West Virginia.

Breaking Down The House Edge On Online Blackjack

Buy crypto instantly with multiple payment methods. All live duel blackjack pays content on Duel Casino is intended for adults aged 18 and over. Gambling involves financial risk — please play responsibly. Most people find the stream through a clip, watch for twenty minutes, then wonder how the table part works.

Aces are worth 1 or 11, depending on which helps the player more. While there are times when insurance is a positive expectation play, only experienced card counters know when they occur. Card counting is not an option online because the casino shuffles the shoe every hand, or at the very least, after dealing just 20% of the shoe. Ironically, the base game returns 99.61%, which ranks among the best blackjack RTPs among Win Studio games. For instance, the Bet Behind feature allows one player to wager on another player’s hand.

On a handset the dealer feed sits up top, your controls drop within thumb’s reach, and the live bet panel, rakeback claim and leaderboards stay one tap away from the bottom navigation. It is the same 100% RTP, provably fair table, just sized for playing a few hands wherever you are. After the round you can reveal the server seed and recompute the result yourself, confirming nothing was touched after you committed your bet. So the chaos on screen is pure theatre, while the cards underneath run on maths you can audit on demand. Can beginners use a blackjack calculator to learn the game? A blackjack calculator is one of the best tools for new players to learn correct decisions without memorizing complex strategy tables.

Blackjack at Duel Casino Explained

Request a withdrawal and watch it arrive in real time. It calculates the best moves based on your hand, the dealer’s card, and winning odds, helping you make confident, strategic choices every time. While the house typically holds a slight edge, making the right moves consistently can shift the odds more in your favor.

• The shoe, the deal and the payouts run separately as a provably fair game, so a hand dealt during an ostrich invasion pays exactly the same as a hand dealt in silence.
• A blackjack calculator is an online tool that helps you decide whether to hit, stand, split, or double down based on your hand and the dealer’s card.
• A blackjack strategy chart is invaluable for any serious player, guiding the best possible moves based on the cards dealt to you and the dealer.
• The deck reshuffles after every hand, so there is no shoe to track.
• On iPhone, tap the Share icon in Safari and choose Add to Home Screen; on Android, open the Chrome menu and tap Install app or Add to Home screen.
• Memorise it, or open a chart on a second screen, the casino does not police it.
• A badge in the bottom-right gives the dealer’s first name and shift ID.
• In-house games running at 100% effective RTP.
• Each shuffle is HMAC-SHA-256 of the committed server seed, your client seed, and a nonce, mapped through Fisher-Yates.
• A two-card 21 is a blackjack and pays more than a normal win.
• Each of these subgroups is recognised by a symbol and are referred to as suits.
• Some players find it obnoxious and just want to play the hand in peace; plenty of others tune in precisely because they never know what is going to wander on set next.

Duel BlackJack Live

No betting system can overcome the house edge in the long run. Card counting gives you an edge but requires perfect play and large bankroll. Always stick to basic strategy as your foundation. In-house games running at 100% effective RTP. The Duel Blackjack Live table doubles as the most chaotic broadcast in crypto gambling, and this is where every stream clip worth watching ends up.

• These short, practical guides take you from a fresh account to your first withdrawal, and show how to unlock the maximum rakeback rate before you play a single hand.
• Editorial methodology and corrections are documented on the methodology page.
• Memorise the table below or keep it open in another tab.
• There is a steady crowd of roughly a thousand people watching at any moment, so the chat is always alive and the room never feels staged.
• That said, the Terms of Service reserve the platform’s right to request verification at any point.
• One of Duel Casino’s most distinctive features is its privacy-first, no-KYC approach.
• After the initial two cards are dealt, if a player believes they will lose, they can surrender, or bow out of the game, and only lose half of their original bet.
• Rakeback earnings are exempt from this requirement and can be withdrawn at any time.
• In practice, this happens when AML filters are triggered or fraudulent activity is suspected.
• Unlike calculators, card counting is often discouraged or banned in casinos.
• Players can begin a round of online blackjack for real money by using the bet selector to place a wager.
• Set limits, take breaks, and never gamble more than you can afford to lose.
• Diamond Bonus can only be found on SG Digital’s Super Fun Extreme blackjack game.
• The casino features a diverse range of blackjack games, including Classic, Double Deck, European, and Bitcoin Blackjack.

The exception is live dealer blackjack, which technically players can count. For those who don’t know, deck penetration refers to where the cut card is placed at the beginning of a shoe. If the deck penetration is 50%, it means only half the shoe is played before a dealer shuffle. The return-to-player percentages listed by online blackjack suppliers are only theoretical numbers based on millions of hands, and more importantly, perfect play.

Full Duel Blackjack rule set

Live dealer tables from third-party providers require a real-money account. In June 2026, Duel Casino’s live blackjack table made global headlines. Blackjack is the only original where your decisions change EV. Optimal basic strategy is a 17-cell decision matrix (player total × dealer up-card) that drops the edge from ~5% (random play) to 0.5% (perfect play). Memorise it, or open a chart on a second screen, the casino does not police it. The house margin lives entirely in the gap between your decisions and the chart.

Play Blackjack Online

3 minutes of Iron Mike dealing live blackjack. The session was captured on camera in full — 16 exclusive clips showing Tyson at the table, dealing hands, reacting to the action, and bringing the kind of energy only he can. You can watch every single clip on this page. But if you want to sit at that table yourself — that requires an account at Duel7.com.

Duel runs the table like a 24/7 variety show. Costumed performers and oddball characters regularly crash the set to keep chat entertained. It is deliberate shock value and has no effect on the cards, payouts or fairness. Duel is crypto-only, with no cards and no bank transfers anywhere in the flow. That keeps deposits fast, fees low and onboarding almost instant. You fund and cash out in the major coins and stablecoins, and winnings settle straight back to the very same wallet you sat down with.

Crypto-First

Open to all players — no tiers, no VIP requirements. Every bet contributes to your leaderboard position. 50% of the house edge is returned to your balance on every slot spin, automatically. Crypto withdrawals processed automatically — no manual review, no waiting. Refer to the chart every time you need to make a decision during the game to ensure you’re making optimal choices, maximizing your chances of winning.

How to Deposit

The catch is that if the dealer busts on 22, all bets push. It returns 99.12%, which isn’t great for a blackjack game, but it’s not horrible either. Duel isn’t competing on volume or bonus optics — it’s competing on mathematics. Where Stake takes a 1–2% house edge on its Originals, Duel takes 0.1%. Where most platforms offer rakeback only to high-tier VIP players after months of grinding, Duel gives 50% instantly to everyone on every spin, from day one.

Reading about the chaos only gets you so far. Two clips below show what a session actually looks like, from a clean dealer run to the kind of moment that ends up clipped across social feeds. The full archive of fourteen clips, each logged with its on-screen broadcast time, table limits and dealer ID, lives on our Duel Blackjack videos page.

We Priced This Table Ourselves

Blackjack is also one of the few games where the player is an active participant. Players may not completely control their fate, but they have a large hand in it. Online casinos should also cater to players with more nuanced tastes, like those drawn to live blackjack, unique blackjack variations, or games with many side bets.

These player-friendly rules achieve exact 100% RTP with perfect basic strategy. There is no app to hunt for in the App Store or Google Play, and nothing to download. For most players this is the only “app” they will ever need.

• Ensure your blackjack strategy chart matches the specific game you’re playing.
• Slots return 50% of the house edge, instantly, with no strings.
• Duel is 100% crypto with no deposit or withdrawal limits and no fees from Duel itself, you pay only the blockchain network fee.
• The stream is served in demo mode, which is why the help panel and the paytable can be read without an account, and why anyone can check the lines below for themselves.
• ThunderPick is recognized for its innovative approach to online blackjack, incorporating features that engage players.
• Print a basic strategy card or keep the chart on this page open.
• The dealer then passes out one card face up to each player, including themselves.
• Nolimit City brings its distinctive max-win mechanics, and Relax Gaming adds titles such as Money Train 4.
• What it does guarantee is that you are not quietly throwing away the rare edge a zero-edge table actually hands you.
• Twenty collapsible sections cover the objective, payouts, side bets, shuffling, the RTP figures and the auto-decision policy.
• 100% crypto casino with support for Bitcoin, Ethereum, Tether, Litecoin, and Dogecoin.
• Blackjack is a classic case of a game that’s easy to learn and (somewhat) difficult to master.

Games

Every player — from a first-time $10 depositor to a high-rolling regular — receives the same 50%+ rakeback rates from day one. There is no grind-to-unlock, no point accumulation threshold, and no arbitrary tier system gatekeeping the best rates. The leaderboards effectively serve as the de facto VIP competition layer, rewarding high-volume play with tournament prize money rather than incremental cashback percentage gains. Duel Casino’s competitive promotions function as the platform’s high-value loyalty layer.

Conservative Betting

• While Rainbet’s “massive” monthly race tops out at $500,000, Duel makes that figure look like pocket change — the monthly prize pool reaches $10,000,000.
• The exception is Pennsylvania, where casinos are forced to offer surrender and other player-friendly rules.
• As for PokerStars, its loyalty program has been greatly diminished, and it doesn’t offer the best new player bonus or recurrent promotions.
• The whole experience is built to run in a mobile browser, so there is no app to download and nothing to install.
• Both casual players and experienced blackjack enthusiasts will find plenty to enjoy at Cafe Casino, making it a popular choice for online blackjack.
• Duel loads as a single-page app that scales the live table, the stream and the chat down to a phone without losing the feel of the desktop version.
• Late surrender would be worth about 0.07 of a point if it were offered.
• We earn no commissions from player sign-ups, deposits, or wagers.
• All legal US blackjack apps allow players to set deposit, time, and spending limits.

Practice with blank strategy sheets and drills to internalize these decisions, making them second nature during gameplay. Effective bankroll management is also crucial; limit your bets to no more than 1-2% of your total bankroll to stay in the game longer and mitigate losses. Some casinos, like DuckyLuck Casino, feature exclusive variants that elevate your gaming experience. Whether you prefer the classic game or are looking to try something new, there’s a blackjack variant to suit every taste.

Ready to Beat the Dealer?

For example, WOW Vegas Casino offers blackjack online in nearly all states. All data transmitted between the player’s browser and Duel Casino’s servers is encrypted using industry-standard 256-bit TLS (formerly SSL) encryption. This is the same technology used by major banks and financial institutions to protect sensitive data. The platform’s privacy policy complies with international data protection standards, and personal information is never sold to third parties. The slots section houses 1,000+ titles from a carefully selected group of premium providers.

Skip the Welcome Bonus. Track Rakeback.

• Gamblers Connect does not operate as a player acquisition channel under any regulatory framework including MGA, UKGC, or DGOJ.
• You should do this because your down card might be of a high value and unless you’re careful, you’ll exceed 21.
• The slots benefit directly from Duel’s 50% instant rakeback model.
• Where a cell is blank the hand cannot occur on two cards.
• Surrender appears nowhere in the game’s rules, and this page used to advise using it on hard 16, which was wrong and has been corrected.
• If it were instead an 8-deck game where the dealer hits soft 17, only allows one split per hand and no surrender, the edge shoots up to 0.66%.
• Variance is real, basic strategy still matters, and a cold run of cards will still cost you a session.
• Next, for the other players, the dealer passes out one more card face up; for themselves, the dealer gets one more card face down.
• Shoe reshuffles each hand – counting ineffective, skill in decisions.
• To answer this honestly, let’s use the concept of Net Edge — the casino’s real mathematical advantage after all bonuses are factored in.

If players insist of placing side bets, this isn’t a bad option. Many of these may not seem like big numbers, but considering that the average blackjack game has a house edge of 0.5%, every little bit matters. Licensed online casinos cannot launch new games until each unit investigates them and the Bureau reaches a consensus agreement to issue its approval. Similar protocols exist in other legal US online casino markets. Players in states without legal online gambling also have options, courtesy of sweepstakes casino sites.

The only true way to overcome the house edge is to frequently claim bonuses and promotional offers. Even if the wagering requirement is a hefty 100x, players will still have a temporary edge over the house. At 200x and with smart game selection, they’ll still be playing a slightly better than break-even game. FanDuel also offers live dealer blackjack games from Evolution and welcomes new casino players with a blackjack-friendly bonus. The in-house games at Duel Casino — including the crash game, dice, mines and plinko — use cryptographic provably fair technology. Players can verify any past game outcome using the server seed, client seed and nonce provided after each round.

Duel does the opposite with its public High Scores page, a live hall of fame that openly shows the platform’s biggest action in real time. It is a transparency play that doubles as pure entertainment. Monarch is unusually visible for a casino owner. He introduced himself directly on the site, regularly appears in the live chat and Discord, and answers players on X. That level of founder engagement is rare in this industry and tends to keep the platform accountable in public. Move to the Duel Originals and the gap widens considerably.

The ProfitDuel Blackjack Simulator is the ultimate blackjack calculator that combines smart strategy guidance with real-game simulation to boost your skills. Every spin on slots I get 50% back instantly — no wagering, no BS. Withdrew everything to BTC in under a minute. Incorporating these advanced strategies and tips will set you on the path to mastering online blackjack and enjoying a more successful gaming experience. With engaging gameplay and live dealer options, Wild Casino brings the excitement of a real casino to your screen.

Pragmatic Play

The Technical Services Bureau consists of an Engineering Unit, Cyber Security and Analytics Unit, Information Technology Investigation Unit, and a Quality Assurance Unit. In addition to its excellent game selection, DraftKings Casino rewards online blackjack players through its lucrative Dynasty Rewards program. Blackjack players can also win random jackpots of up to $5,000 and are frequently the targets of generous promotions. In this game, players play four simultaneous hands of blackjack along with one side bet, and the side bet pays out if they’re dealt one or more 20s, up to 420x their initial wager. BetMGM Casino is available in four states (NJ, PA, MI and WV) and supports well over a dozen online blackjack games from multiple providers. Unlike virtually every other online casino, Duel explicitly rejects tiered loyalty programs.

Low volatility does not mean you cannot lose a stack in an hour. Bring 100 minimum bets for a session you want to finish without reloading. Chasing a loss with bigger bets does not shrink the 0.5% edge. It just makes the swing hurt more when variance turns against you.

Place Your Bet

No, most modern blackjack calculators are browser-based and work instantly on desktop or mobile. Just enter your cards and get instant strategy advice—no download needed. What’s the best hand to use a blackjack calculator on? You can use a blackjack calculator on any hand, but it’s especially useful for borderline decisions like soft 17s, pairs, or dealer upcards like 9, 10, or Ace. Ready to take your skills beyond the calculator? Put your strategy into action and level up your game with real casino offers through ProfitDuel.

• A $25 hand at 0.5% edge returns an extra $0.10 in rakeback every single hand.
• Every outcome is verifiable and the payout rules favour the player.
• Treat third-party slots as ordinary slots, not 100% RTP games; the true zero-edge maths lives in the Originals and the blackjack table.
• Variance is real, basic strategy still matters, and a cold run of cards will still cost you a session.
• For a platform built on disruption and crypto-first values, the episode cemented Duel’s reputation as the most provocative live casino in the industry.
• The slots benefit directly from Duel’s 50% instant rakeback model.
• Amazing concept — 50% rakeback on slots means my effective losses are halved compared to other sites.
• First, the Duel Blackjack Original — an in-house provably fair game with a mathematically certified 100% RTP, meaning zero house edge.
• Where a cell is blank the hand cannot occur on two cards.
• The library runs to 600+ live tables powered by Evolution Gaming and Pragmatic Play Live.

Those trims travel further in a weekend than any banner the casino could buy, which is exactly why Duel keeps booking them. Slots return 50% of the house edge, instantly, with no strings. Rakeback lands in your wallet and withdraws like standard balance. Blackjack rewards players who use strategy, not guesswork. Calculators are legal and widely used for online play and training, while card counting is a live play method requiring intense focus and skill. If you’re looking to improve decision-making quickly and legally, a blackjack calculator is the best place to start.

• A green cone hat behind the shoe, five seconds long5.11 seconds, the shortest thing on this page.
• The casino features a diverse range of blackjack games, including Classic, Double Deck, European, and Bitcoin Blackjack.
• Editorial methodology and corrections are documented on the methodology page.
• Set limits, take breaks, and never gamble more than you can afford to lose.
• After the initial two cards are dealt, if a player believes they will lose, they can surrender, or bow out of the game, and only lose half of their original bet.
• Open the live table and click the question-mark icon above the stream.
• Bring 100 minimum bets for a session you want to finish without reloading.
• We’ve verified Duel Blackjack shoes across multiple sessions in May 2026.
• For in-house games, Duel Casino uses a provably fair system that allows any player to independently verify the fairness of each game outcome after the fact.
• There is a steady crowd of roughly a thousand people watching at any moment, so the chat is always alive and the room never feels staged.
• Free online blackjack games offer an excellent way to practice and refine strategies without financial risk.
• Beyond live dealer tables, Duel Casino offers its own Duel Blackjack Original — an in-house provably fair game with a certified 100% Return to Player.
• One of Duel Casino’s most distinctive features is its privacy-first, no-KYC approach.
• This is a stated principle of the platform, clearly communicated on the site.

While Rainbet’s “massive” monthly race tops out at $500,000, Duel makes that figure look like pocket change — the monthly prize pool reaches $10,000,000. If you provided an email at sign-up, use the standard password recovery flow. If you registered through Google or Steam, skip the recovery entirely — just log in the same way you did the first time. You can sign into your Duel account in three ways, from any device. The classic route is email and password — just enter the credentials you created at registration. If you signed up through Google, hit “Continue with Google” for a one-click login with no password required.

These games offer solid returns hovering around 99.50% and offer tons of side bet action. For instance, Blackjack Millionaire Pro features a side bet that awards up to 200,000x to players who hit consecutive blackjacks. The only real 0% house edge blackjack in crypto. Perfect rules, provably fair, 100% RTP with basic strategy at duel.com. From a player-protection standpoint, Duel’s responsible gambling provision is seriously deficient, evidencing only a responsible gambling policy and access to account history.

Yes, but only in states that have passed legislation legalizing online casinos. However, sweepstakes casino sites are available in most states and leverage US sweepstakes laws to offer strikingly similar online blackjack experiences. Taking advantage of other promos like leaderboards, reload matches, and loss-back offers will also minimize the house edge or even flip it in the player’s favor. Loyalty programs also trim the casino’s advantage, with the best programs kicking back roughly 30% of players’ expected loss.

Buy crypto instantly with card, PayPal, or Revolut via Swapped integration. The stream is open to anyone and you can watch the table, the guests and the chat without an account or a deposit. You only need to register and fund a balance when you want to take a seat and play hands yourself. Reshuffling between hands removes the count’s information value. The 0.5% edge requires basic strategy alone, no further skill caves the math.

Is using a blackjack calculator considered cheating? No, using a calculator isn’t cheating when you’re playing online or practicing. It’s a legal strategy tool, similar to studying charts or reviewing hand history to improve your skills. Do I need to install software to use a blackjack calculator?

For casual blackjack players who do not know basic strategy, the 100% RTP headline is misleading. Empirical play at intuitive-decision quality lands closer to 97-99% RTP. The 80% rakeback brings the effective figure higher but does not fully close the gap to chart-perfect play. Get 80% rakeback on every hand, compete in $1M monthly tournaments, and experience provably fair blackjack with 0% effective house edge. Every time you play a hand at Duel Blackjack, the house edge is split — and 80% is returned to your balance instantly. A $25 hand at 0.5% edge returns an extra $0.10 in rakeback every single hand.

Security, Licensing & Responsible Gambling

Supported assets, networks, odds, RTP, promotions and licensing can change at any time, always confirm current terms on the official site before playing. Blackjack also feeds into Duel’s running leaderboards. Every wager earns points, and when a race timer ends the top of the table shares a prize pool. Because points are built from turnover rather than losses, winning hands count towards your position too.

Duel is cryptocurrency only, with deposits from about USD 10 equivalent (varying by coin) and no fiat or card options. Gamblers Connect does not operate as a player acquisition channel under any regulatory framework including MGA, UKGC, or DGOJ. Yes, covering 50+ sports and 17 esports with pre-match and live markets, a bet builder and competitive crypto odds.

• Players determine a set amount of rounds (also known as hands or deals) that the game will go to (instead of the points selection above).
• Traditional casinos keep 100% of their house edge.
• Mistakes in the process can happen too and sometimes you might need a bit of advice on what to do.
• Streams run in HD on both desktop and mobile, and the dealer teams are professional.
• Currently, at CardzMania, whenever a new round starts, the decks are shuffled completely, including the cards from the previous round.
• The design prioritises frictionless play over player safety.
• Every hand verifiable via seeds, making it the fairest blackjack in crypto gambling.
• The Original game publishes no rule sheet of the kind the live table carries, so we have not tried to price it here; the numbers further down this page are the live table only.
• However, online blackjack simplifies the learning process by offering free-play tables, low minimum wagers, and no pressure from other players.
• You can enjoy a wide range of blackjack game styles to suit your preferences.
• After logging in, navigate to the cashier, select your chosen cryptocurrency, and the platform generates a unique wallet address.
• The 80% rakeback on Duel Blackjack is the unique structural mechanism of this game on the platform.

What are the Benefits of a Blackjack Calculator?

Treat third-party slots as ordinary slots, not 100% RTP games; the true zero-edge maths lives in the Originals and the blackjack table. This is genuinely unprecedented in the casino industry. No established operator offers a zero-house-edge blackjack variant. Duel can do this because its revenue model relies on rakeback rather than house edge — the platform earns a small margin on volume rather than exploiting individual players. Duel Casino Blackjack offers 60% instant rakeback on every hand, boosting effective RTP to 99.78%, plus live dealer sessions that have gone viral worldwide. It runs as a continuous 24/7 live broadcast around a single one-on-one blackjack table from the Duel Originals suite.

• It is calculated from your total turnover, not just losses, so winning hands build it too.
• The platform offers two distinct blackjack experiences.
• A live basic-strategy tip shows the mathematically correct move on every decision, so you learn perfect play while you go.
• Duel Casino intentionally rejects traditional VIP tier systems.
• Track high vs low cards to know when the deck is favorable.
• That’s why it’s so important to memorize basic strategy, or to least keep a basic strategy card handy while playing.
• The reason why Tropicana didn’t make the cut is because it’s only available in the New Jersey market.
• If a player and the dealer have the same hand, even a blackjack hand, the player pushes and receives their bet back.
• Players determine a set amount of points when the game ends.
• Duel’s race system is where the platform really brings out the heavy artillery.
• Every wager earns points, and when a race timer ends the top of the table shares a prize pool.

Duel Casino integrates a full sportsbook within the same account, covering football, basketball, tennis, ice hockey, esports, MMA and more. Live in-play betting is available, and bets can be placed using the same cryptocurrency wallet used for casino games. The mobile layout adapts intelligently to different screen sizes.

Stand on soft 18 vs dealer 2-8, hit vs 9 through Ace. Double soft 13 through 18 when the dealer shows 5 or 6. The whole experience is built to run in a mobile browser, so there is no app to download and nothing to install. Duel loads as a single-page app that scales the live table, the stream and the chat down to a phone without losing the feel of the desktop version.

In addition, players in 46 states can use sweepstakes casino sites to play blackjack online for real money prizes. Dealer stands on soft 17, unlimited splits/doubles – pure skill and variance. Every hand verifiable via seeds, making it the fairest blackjack in crypto gambling. Overall, Duel’s game fairness and payout mechanics are verifiable and fast, but its regulatory standing and player protections are weak. The Anjouan licence can be verified, but it is an offshore, lightly regulated permit that gives players little protection or recourse. Identity and age checks are largely absent, and responsible gambling tools are minimal, so the platform favours speed and anonymity over safety.

The 416-card shoe order held under SHA-256 verification. The 80% rakeback on Duel Blackjack is the unique structural mechanism of this game on the platform. Standard Duel Originals rakeback (on Dice, Crash, Mines, etc.) is at the lower platform-wide rate; Blackjack alone receives the boosted 80% figure. Independent review site providing comprehensive information about Duel Casino and other crypto gambling platforms. Use our link for instant crypto access to Duel Originals blackjack and other 100% RTP titles. Opening segment of the June 2026 live blackjack session.

The RGI is our proprietary framework evaluating operators across 12 responsible gambling criteria including self-exclusion, deposit limits, reality checks, and cooling-off periods. Duel Casino positions itself as a no-KYC platform — and in the vast majority of cases, that holds true. During standard crypto activity (deposit → play → withdraw), no documents are required. This is a stated principle of the platform, clearly communicated on the site. Most casinos compete on the size of their welcome bonus. Duel proposes a different competition — a competition of mathematics.