A272607 Possible single line scores, not counting multiples, in duplicate bridge.

50, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 230, 240, 250, 260, 270, 280, 300, 340, 350, 360, 380, 400, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660

Offset: 1

Author

Jonathan Vos Post and Robert G. Wilson v, Nov 09 2016

Keywords

• easy
• fini
• full
• nonn

Comments

Not the same as rubber bridge. The difference is in what is scored above and below "the line".

There are only 204 possible scores in duplicate bridge.

Multiples of ten not present: 10, 20, 30, 40, 60, 220, 290, 310, 320, 330, 370, 390, 410, 820, ..., .

a(i) can be made k ways: 1, 1, 1, 3, 3, 5, 2, 4, 5, 7, 2, 7, 6, 4, 7, 2, 5, 3, 1, 4, 2, 2, 3, 2, ..., .

Examples

			50 is in the sequence because if opponents, "They", bid something and are down by one, "We" score 50.
70 is in the sequence because if "We" bid one minor suit, either Clubs or Diamonds, "We" score 70.
100 is possible three different ways: Down one vulnerable, down one not vulnerable doubled and down two not vulnerable.
		

Links

• Jonathan Vos Post and Robert G. Wilson v, Table of n, a(n) for n = 1..204
• American Contract Bridge League, How to keep score
• Wikipedia, Bridge scoring

Crossrefs

Cf. A114959.