i will start with polish club (I play it all my life with various people as it's standard here).
1) It's very passive; you open 1♣ very often which isn't exactly preemptive and worse yet partner can't make weakish 1/1 response (cause they are GF opposite strong version of 1♣) so you basically have to bid 1♦ with every hand in 0-7 range and with most in 8-11 range which don't have 4M or are not suitable for 1NT. This allows opponents a free run in competition and it's very easy for them to estimate combined assets of their hands;
2) 12-17hcp range for 1♦/♥/♠ openers is really clumsy. You still need to differ between "weak" and "strong" range in almost all bidding sequencies which doesn't allow you to jump to game fast and do force you to continue bidding with marginal values (say if i goes 1♥ - 1♠ - 2♣ you don't want to pass any 9 and 8/7+ doesn't make you feel good either).
Even people who play 11-22 openers with Gazilli are in better situation because if they don't bid Gazilli they have maximum of 16hcp; I feel 12-17 range is taking the worse from both worlds (limited and wide range openers).
3)If you are dealt strong hands with 6+♦ you are basically screwed cause those are unbiddable in the system. Fortunately those hands are rare and you can get away by bidding them like strong NT.
4)2♣ opener which is 11-14 with 5+♣ (5-4M or 6+) is pathetic; I guess I don't need any arguments for that. It's awful. Some young polish players started playing 2♣ as majors but then the system after 1♣ opener is not playable because in 1♣ - 1♠ you lack forcing bid with ♣; they just hope it won't come up. At MP's it's probably reasonable.
5)
Not really part of the system but in Poland it's standard to play 2♦ as multi and 2♥/♠ as 2 suiters (older players play 2♦ Wilkosz). I hate multi. You can't preempt effectively after it (and if you do you tell opponents a lot about yoru distribution in other major) and it's just too easy to bid after it. I don't see real gains from 2suiters either. 2nd suit is not known so preempting is again not an option and it makes very easy for them if they end up declaring.
6)2NT - minors; again standard here. This way bidding strong balanced hands is very awkward because for example:
1♣ - 1♦
1NT is 18-21 (3point range)
and 1♣ - 1♠ - 2NT is 18+ which makes it very difficult for responder to make decisions with say 11hcp. It's even worse in comp, fortunately they usually don't bid too much if we get one of those 18+ balanced hands.
7)Not forcing 1NT;
1♠ - 1NT = not forcing, 7-11; it's so bad, we often miss partscores with trumps 6-3 or are playing in 1NT having stiff to xxx somewhere. People here are like : "a MP's it pays off to play in 1NT". Fortunately most of my partners understand need for forcing 1NT but still non forcing approach is standard and part of the system.
8)I think polish 1♣ is much worse in comp than say precision 1♣. Common argument is that it should be better because opps can't jump with anything because we are often 12-14bal and they are preempting themselves. I guess people who says so never played polish club or precision. Jumping with everything just fail regardless but if they have reasonable preempt you are in much more difficult situation after polish 1♣ because you still have to worry about stopping in partscore every time and can't bid suits naturally at 3 level without 12+hcp.
That being said there are a lot of good things about polish ♣ but this thread is about bad parts. Share yours

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