Z_Defense against Polish Club - folksbridge21/system2 GitHub Wiki

https://bridgewinners.com/article/view/defense-against-polish-club/

Polish club 1C open can be any of:
11+ - 14 NT
12 - 17, three-suiter with ♦ shortness (e.g. 4414)
15 - 17, 5+♣ unbalanced
18+ any

可以当做自然1C方式处理，其他叫牌保持不变
如果持有强无将的牌，听到对方1D示弱，开叫人1M只表示3张，我方加倍表示强无将实力
直接争叫1NT表示source of tricks

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