The Tao of Gaming

Boardgames and lesser pursuits

The Giorgio Duboin Bridge Cheating Scandal

BridgeWinners has posted a summary of the evidence against Giorgio Duboin in recent online play. There are also links to the full hand records and analysis by several world class players. (The full report is here).

The one nice thing about online bridge is that it facilitates these kind of analysis into “Suspicious” and “Anti-suspicious” deals. (A suspicious deal is one where you make an abnormal decision that works out much better than suspected, whereas an anti-suspicious deal is one where the abnormal decision’s punishment works out even more poorly than normal). The methodology was to look at G.D.’s play when kibitzers were allowed (and he therefore may have been able to login with a second ID to see the layout or have an accomplice do that and relay the info) and when no kibitzers were allowed.

I haven’t read the full report, but even the summary seems damning with solid methodology and reporting, but perhaps gamers with more experience in this field will have a different opinion.

Written by taogaming

November 7, 2020 at 5:33 pm

Posted in Bridge

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2 Responses

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  1. People play in online games when anyone could login and cheat, and are then shocked when people cheat?

    Geoff Speare

    November 7, 2020 at 6:10 pm

  2. I don’t have any particular opinion; I haven’t studied it enough. These conclusions require a LOT of work to obtain. Unfortunately, usually the most clear cut evidence is how quickly someone takes an action. Someone doubles a slam in an instant, cashes an ace, and leads to his partner’s without pause for thought…he knows something. Some pro makes a weird bid that gets them overboard and at the same time steals the dummy from his client, then gets lucky and makes? Not at all clear he’s cheating.

    Do I have some confidence in the ability of the people who wrote that report? Yes. Will I agree without study? No.

    Jeff Goldsmith

    November 9, 2020 at 9:02 pm


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