This hand came up in our GNT district QF last Sunday. We were playing against a client and a local pro.
The 2♣ bid was slightly out of tempo, 2♥ was in tempo, and S (the client) bid 3♠ after more than 10 seconds. After the 3♠ call, N (the pro) told us he had forgotten to alert 2♣ (Gazilli). S said he hesitated over 2♥ because he was trying to find a bid as if N had alerted 2♣. We called the director and reserved our right to call him back after the hand was over.
4♠ made on a ♦ lead. I think 4♠ is always cold on any lead (defense gets two ♠ tricks and ♦A). I thought pass with the S hand was not only logical, but also clear. If N had alerted 2♣ and then bid 2♥, he would have shown at most 8 HCP (2♦ over 2♣ is artificial and shows 9 HCP or more). Pass would then seem to be the percentage bid when partner has shown at most 8 HCP. But since N didn’t alert 2♣, S "knew" N might have more than 8 HCP so he decided to bid on. We are friendly with them and were up by a lot with only a few hands left to play so I decided to let it go (we ended up winning by 73 IMPs). I just thought the client took advantage of the UI (maybe unintentionally/subconsciously as he is not experienced at all). If it was the pro who had done this, I would have reported him to the recorder. My question is how do I let the client know that I believe he took advantage of the UI without sounding accusatory? We are FB friends but I don't really know him well. As I said, he is not experienced so I don't think he did this delibrately.
Plus... it's free!