Game Rules: Bridge (Rubber Bridge)

Game Identity

• Name: Bridge (Rubber Bridge)
• Player Count: 4 players (fixed). Two partnerships.
• Teams: Yes — 2 teams of 2. Partners sit across (North/South vs East/West).
• Theme: The world's most complex trick-taking card game. The app tracks Rubber Bridge scoring — "above the line" and "below the line" points with vulnerability tracking.

Scoring Mechanics

• Scoring Variant: Special — dual-line scoring (trick score below the line, honors/bonuses above the line). First partnership to win two games wins the rubber.
• Target Score: Win 2 games (each game = first to 100+ trick points below the line).
• Unit of Scoring: Points per hand, split into above-the-line and below-the-line categories.
• Lower vs. Higher: Higher total score wins the rubber.

Rules & Validation

Per-Hand Logic

• Below-the-Line (Trick Score): Only tricks bid and made in the contract count.

  Contract Level × Suit	Points per trick
  ♣ / ♦ (minor)	20
  ♥ / ♠ (major)	30
  NT (first trick)	40
  NT (subsequent tricks)	30

  • Doubled contracts: ×2. Redoubled: ×4.
  • 100+ below-the-line points in a game = Game won. New "below the line" starts.

• Above-the-Line (Bonus Points):

  Bonus	Points
  Overtricks (undoubled)	20/30 per trick (per suit)
  Overtrick (doubled, not vul)	100/trick
  Overtrick (doubled, vul)	200/trick
  Making doubled contract	+50
  Making redoubled contract	+100
  Undertricks (not vul, undoubled)	−50 each
  Undertricks (vul, undoubled)	−100 each
  Undertricks (doubled, 1st, not vul)	−100
  Undertricks (doubled, 1st, vul)	−200
  Undertricks (doubled, 2nd/3rd, not vul)	−200 each
  Undertricks (doubled, after 3rd, not vul)	−300 each
  Honors (4 top trumps in one hand)	+100
  Honors (5 top trumps in one hand)	+150
  Honors (all 4 Aces in NT in one hand)	+150
  Slam (Small Slam made)	+500 (not vul) / +750 (vul)
  Slam (Grand Slam made)	+1,000 (not vul) / +1,500 (vul)
  Rubber bonus (2-0 in games)	+700
  Rubber bonus (2-1 in games)	+500
  Unfinished rubber, 1 game	+300

• Vulnerability: A partnership becomes vulnerable after winning one game. Bonuses and penalties increase when vulnerable.

• Validation Rules:

  • All entries must be integers.
  • Below-the-line entries only for tricks in the bid contract made.
  • Above-the-line entries for all bonuses and penalties.

Special Actions / Bonuses

• Small Slam: Bid and made 6-level contract.
• Grand Slam: Bid and made 7-level contract (all 13 tricks).
• Double / Redouble: Modifier on the contract; affects trick score and overtrick/undertrick bonuses.

Win Conditions

• Condition: First partnership to win 2 games wins the rubber. Rubber bonus added to their final score. Team with the higher total (above + below the line, both games summed) wins.
• Tie-Breaker: The rubber winner always earns the rubber bonus; their total will typically be higher. If the non-winning team has more total points (unusual), no additional tiebreaker is defined in standard rules.

Set Up in Doodle Score

Bridge (Rubber Bridge) doesn't have a dedicated scorecard yet — track it for free using a general scorecard:

1. Tap New Scorecard and choose Paper Score (tracks all players each round in a grid)
2. Add 4 players (adjust as needed)
3. Set Target Score to Win 2 games. (or skip for open-ended play)