Dealer west.
1♣-2♣!-ps-2♠
ps-3♠-ps-4♣
ps-4♠-ps-ps
X -ps-ps-ps
First time we played after the summer, and I didn't remember if 2♣ was majors or michaels. But given that LHO had shown 3+ (best minor). I decided it has to be michaels and alerted like it.
Partner raised, and I bid 4♣ just in case (not sure if this is ethical, feel free to coment). Partner wasn't on the joke and bid 4♠ anyway knowing what was coming.
When LHO led ♣A and RHO assisted I was a bit in flames, why nobody alerted 1♣?. I got no clear anser untill the board was finished, opponent said:
-I open 1♣ because that's my best minor I don't want partner to lead a diamond.
best minor is 100% standard here. No alert= best minor.
I felt like I made a decision based on the wrong information that opponents play best minor, wich they actually do not. But obviously I am also to blame for not knowing my system right. Didnt even bother appealing this at the local, but would appealing had any merit?.

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