--- title: "Duality case on CSGOBig: odds, RTP & drops · gambatracker" description: "Duality ($445.00) on CSGOBig, a CS2 case site: advertised RTP 90.00% from 2 items with odds, observed 90.00% over 2 openings in 30 days." url: https://gambatracker.com/cases/csgobig/54 rendered: 2026-11-11T21:14Z --- [Case sites](https://gambatracker.com/case-sites) / [CSGOBig](https://gambatracker.com/case-sites/csgobig) / [Duality](https://gambatracker.com/cases/csgobig/54) # [CSGOBig](https://gambatracker.com/case-sites/csgobig) · Duality A case on CSGOBig, first seen 3 Nov 2026. Every value is CSGOBig's own item price converted from csgobig coin at the rate on the site page. [24h](https://gambatracker.com/cases/csgobig/54?window=24h) [7d](https://gambatracker.com/cases/csgobig/54?window=7d) [30d](https://gambatracker.com/cases/csgobig/54) [All](https://gambatracker.com/cases/csgobig/54?window=all) Price · $445.00 · 445 CSGOBIG\_COIN Advertised RTP · 90.00% · EV $400.50 from 2 items Observed RTP, 30d · 90.00% · 2 openings, odds method Variance · 0.8× · of price², per opening Tail share · 50.0% · of openings carry half the EV Below price · 50.0% · of openings return less than the price ## Advertised vs observed · per window, 95% band and the advertised marker observed, 95% band advertised outside band small sample 30 days · 2 openings · below min since tracking started · 2 openings · below min -0.5% 107.5% 215.5% **Small sample.** 2 openings and 1.0 expected rare hits: below the 100 openings and 5 hits the test needs, so no verdict. ## Windows · the test per window | Window | Openings | Observed | Dev. | Method | | --- | --- | --- | --- | --- | | [24h](https://gambatracker.com/cases/csgobig/54?window=24h) | 0 | — | — | — | | [7d](https://gambatracker.com/cases/csgobig/54?window=7d) | 0 | — | — | — | | [30d](https://gambatracker.com/cases/csgobig/54) | 2 | 90.00% ±124.7 | — | odds | | [All](https://gambatracker.com/cases/csgobig/54?window=all) | 2 | 90.00% ±124.7 | — | odds | Enough sample: 100 openings and 5 expected rare hits (odds method) or 1,000 openings (sample method). ## Items, odds and values · 2 items · odds sum to 1 · observed counts over 2 openings, 30 days Share of the expected value, most valuable first; colour is the item's rarity. | Item | Odds | Value | EV share | Observed | Expected | Hot / cold | | --- | --- | --- | --- | --- | --- | --- | | [Souvenir Dual Berettas \| Cobalt Quartz (Factory New) Souvenir · weapon · restricted](https://gambatracker.com/items/souvenir-dual-berettas-cobalt-quartz-factory-new) | 50.0% | $801 801 CSGOBIG\_COIN | 100.0% | 1 | 1.0 | 1.00× | | [PP-Bizon \| Sand Dashed (Battle-Scarred) weapon · consumer](https://gambatracker.com/items/pp-bizon-sand-dashed-battle-scarred) | 50.0% | $0.01 0.01 CSGOBIG\_COIN | 0.0% | 1 | 1.0 | 1.00× | Values are CSGOBig's own item prices; EV share = odds × value ÷ EV. Hot / cold compares observed drops of each item with odds × openings; small expected counts are left blank. Odds read from `csgobig:api/cases/getDetails?id=54`, 11 Nov, 19:23 UTC. ## Biggest drops · from this case, by value [Souvenir Dual Berettas | Cobalt Quartz (Factory New) Souvenir · weapon · restricted](https://gambatracker.com/items/souvenir-dual-berettas-cobalt-quartz-factory-new) Hidden $445 445 CSGOBIG\_COIN $801 801 CSGOBIG\_COIN 1.80x 2026-11-03 11:19 UTC ## Latest drops · newest first [All Latest drops →](https://gambatracker.com/drops?casino=csgobig&case=54) **No drops yet** No drop from this case seen yet. ## Catalog changes · price, advertised RTP and contents, per capture | Captured | Price | Advertised | Items | | --- | --- | --- | --- | | 3 Nov, 04:27 UTC | $445 | 90.00% | 2 | Each opening is tested against the capture in force when it happened; a price or odds change starts a new one. listed restricted 50.0% consumer 50.0% best hit $801 (1.80x) 18+ **Case opening is gambling with skins as the currency.** At 90.0% RTP, every $100 put into cases returns $90.00 on average: an expected loss of $10.00 per $100, before any one lucky or unlucky opening. A big drop here says nothing about the next one. [BeGambleAware](https://www.begambleaware.org/) [Help & limits](https://gambatracker.com/responsible-gambling) How these figures are produced and labelled: https://gambatracker.com/llms.txt