If you play the Robot Tournaments almost exclusively, as I do, and you suspect that significantly more than half of your finesses lose in those games...you're correct. In fact, one longtime friend and I have a running joke where we will often mention whimsically in our conversations, "Hey, did I tell you that a finesse worked for me on BBO the other day?" But it has nothing to do with faulty software or unrealistic deal probabilities. It's simply a function of two perfectly innocent factors: The "Best Hand for South" format The opening-lead tendencies of the BBO bots Put simply: if you're playing a Robot Tournament, you're sitting South and are dealt the best hand at the table. Therefore, you are more likely than your robot North partner to (a) become declarer, and (b) hold high-card tenace positions like AQ or KJ in which you wish to take a finesse. Ergo, you will be taking these finesses disproportionately into the West hand. And, West will disproportionally happen to be the opening leader. BBO bots are notoriously passive leaders. That much, I hope everyone agrees on. This is hardly surprising, since there have been a raft of books published in the last 10 years that have analyzed opening lead probabilities and concluded that passive is usually better. Indeed, the one counterexample those books have shown is to lead very aggressively (i.e., away from a king or queen) in a side suit against a small suit slam. And, in my experience, that's also the one time a BBO bot can be counted on to have led away from a royal. So...in BBO Robot Tournament games, West is usually on opening lead. West will lead very passively, usually from a suit in which he holds no honor above a 10. You will more often finesse (in some other suit) through East and into West because of the "Best Hand" format. Ergo, it's more likely -- I'd wager between 55% and 60% -- that these finesses will lose. There's nothing sinister about this. It's just a consequence of the unusual form of bridge we enjoy on BBO.