ACR Poker's Online Super Series XL returns on September 6 with 336 events and more than $50 million in guaranteed prize pools, making it the largest tournament series the Winning Poker Network has ever assembled. The series runs through September 29 and closes with a run of 10 Nosebleed Stakes tournaments carrying buy-ins between $5,000 and $25,000.
For a network that built its reputation on the Venom rather than on breadth, OSS XL is a statement of a different kind: not one enormous tournament, but a month of them.
The Scale of It
Three hundred and thirty-six events across 24 days works out to roughly 14 tournaments a day, every day, for most of a month. That is a schedule designed for grinders rather than for tourists — the player who fires one event and logs off is not the target audience.
The $50 million guarantee puts OSS XL in a specific tier of the online calendar. It is smaller than GGPoker's WSOP Online guarantees and smaller than PokerStars' WCOOP figure, but it is running in direct competition with both, and it is doing so with a very different player pool. That distinction matters more than the raw number.
ACR's traffic profile is heavily weighted toward North America. Where WCOOP and WSOP Online draw from a genuinely global pool that skews European, Brazilian and Asian, ACR's fields are dominated by US and Canadian players who cannot access the regulated-market alternatives. For those players, OSS XL is not one option among three. It is the option.
The Leaderboard Structure
Alongside the tournaments, ACR is running three separate leaderboards — High, Medium and Low — with more than $60,000 in added cash and tournament tickets on offer. First place in the High leaderboard takes $15,000, the Medium pays $7,500, and the Low awards $4,000.
Splitting leaderboards by buy-in tier is the correct design, and it is worth understanding why. A single combined leaderboard is almost always won by whoever plays the highest buy-ins, because leaderboard points typically scale with prize pool. That turns the promotion into a rebate for high-stakes regulars and offers nothing to the $22 player who fires 40 events. Tiered leaderboards fix the incentive: a low-stakes grinder competes against other low-stakes grinders.
The practical takeaway is that leaderboard equity should factor into your event selection. If you are committed to a buy-in band anyway, concentrating volume inside that band rather than scattering it across tiers meaningfully improves your leaderboard chances without changing your risk profile. Our bankroll management guide covers how to set that band before a series starts rather than drifting upward mid-run.
Nosebleed Stakes: The Closing Stretch
The 10 Nosebleed Stakes events from September 21-28 are the series' high-stakes finale, with buy-ins from $5,000 to $25,000.
High-roller blocks at the end of a series serve a specific purpose. By that point in the schedule, a portion of the player pool is running well and holding series winnings they are willing to reinvest. Scheduling the biggest buy-ins for the final week captures that money before it leaves the site. It is a well-established pattern — WCOOP and the WSOP Online series both do a version of it — and it works.
For recreational players, the honest read is that these are not your events. A $25,000 buy-in tournament on a network the size of ACR will draw a field composed almost entirely of professionals and backed players, with a handful of wealthy recreationals who can afford the variance. The fields will be small and the skill edges will be enormous. Watching them is more profitable than playing them.
Where the Nosebleed block does create value for everyone else is in satellites. High-buy-in events generate satellite ladders, and satellite fields are frequently softer than the target tournament's field because they attract players chasing a number rather than evaluating an edge. Our satellite strategy piece covers the mechanics.
US-Friendly Scheduling
One structural detail worth noting: ACR has been deliberately scheduling more series events in US-friendly time slots.
This sounds minor. It is not. Online poker's default schedule was built around European evening hours, because that is where the money was for most of the game's history. A player on US Pacific time trying to play a series built for a Central European audience is looking at start times in the early morning and deep-run finishes at lunchtime on a workday.
ACR moving its schedule toward North American prime time is a direct competitive play against the international sites, and it is the kind of change that raises participation more reliably than an extra million in guarantees. A tournament a player can actually finish is worth considerably more than one they cannot.
If you have historically skipped online series because the timing did not work, this is the one to re-examine. Full details on the room's structure and traffic patterns are in our Americas Cardroom review.
Where OSS XL Fits in a Crowded September
September 2026 is the most congested month in the online tournament calendar in years. WCOOP runs September 6-30 on PokerStars. GGPoker's WSOP Online series runs through September 29. WPT Global's Fall Festival occupies September 8-30. And OSS XL runs September 6-29.
Four major series, effectively identical dates, all competing for the same finite pool of player attention and bankroll.
For players with access to multiple platforms, this creates a genuine allocation problem rather than an embarrassment of riches. Spreading a fixed budget across four series produces four undersized sample sizes and four sets of near-misses. Concentrating it in one produces a real shot at a result.
The sensible approach is to pick based on where your edge is largest, not where the guarantee is biggest. For most US-based players that decision is made for them by market access. For everyone else, the relevant questions are field softness, time-zone fit, and whether the buy-in structure matches your roll.
Overlay Watch
Whenever a network dramatically increases its guarantees, overlays become a live possibility. Three hundred and thirty-six events with $50 million guaranteed against a network that is not the largest in the world means some tournaments will not fill.
Overlay hunting is one of the few genuinely free edges in online poker, and it is available to any player willing to watch late registration numbers. The method is simple: check registered entries against the guarantee shortly before late registration closes, calculate whether the fees collected cover the promised prize pool, and register if they do not. A tournament running a 20% overlay has effectively cut your buy-in by 20%.
The events most likely to overlay are the ones scheduled at awkward times, the higher buy-in events outside the Nosebleed block, and the non-Hold'em variants. The flagship Sunday events almost never overlay.
What This Means for Players
Pick one series and commit. Four overlapping majors is a trap for anyone with a fixed budget. Choose the one that best fits your market access, time zone and stakes, and put your volume there.
Use the tiered leaderboards. If you are grinding a specific buy-in band, the added $60,000 across three leaderboards is real equity you are entitled to. Concentrating volume within your band is free.
Skip the Nosebleeds, play the satellites. The $5,000-$25,000 block is a professional's playground. The satellite ladders feeding it are not.
Watch for overlays in the schedule's quiet corners. A series this large on a network this size will leave money on the table in the off-peak and non-Hold'em events.
Match your format to your edge. With 336 events, there will be Pot-Limit Omaha, knockout and mixed-format tournaments drawing far weaker fields than the headline No-Limit events. Our Omaha guide and cash games vs tournaments comparison are useful starting points if you are considering a format switch for the series.
OSS XL will not out-guarantee GGPoker in September. It does not need to. For a large and specific slice of the poker world, it is the biggest thing happening this month by a considerable distance.