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In Germany there are these systems:

Youth: 4 players, until 6 points

D1: D1
D2: D2

A1:B2
A2:B1
A3:B4
A4:B3

A1:B1
A2:B2
A3:B3
A4:B4


Women: 4 players, until 8 moints (first league until 6 points)

D1: D1
D2: D2

A1:B2
A2:B1
A3:B4
A4:B3

A1:B1
A2:B2
A3:B3
A4:B4

A3:B1
A1:B3
A2:B4
A4:B2


Men: 6 players, until 9 points (first league: 4 players, until 6 points)

D1: D2
D2: D1
D3: D3

A1:B2
A2:B1
A3:B4
A4:B3
A5:B6
A6:B5

A1:B1
A2:B2
A3:B3
A4:B4
A5:B5
A6:B6

D1: D1


I am interested, how in other countries the rules and systems are!