Examples
Examples
Try the starting example
- Contract level above six tricks
- 4
- Strain C, D, H, S or NT
- S
- Declarer vulnerable yes/no
- no
- Contract doubling: none, double or redouble
- none
- Total tricks taken by declarer side
- 10
- Duplicate-board score from declarer perspective
- 420
- Contract trick points if made
- 120
- Game or partscore bonus
- 300
- Slam bonus
- 0
- Doubled/redoubled fulfillment bonus
- 0
- Overtrick points
- 0
- Undertrick penalty paid to opponents
- 0
Try another scenario
- Contract level above six tricks
- 4
- Strain C, D, H, S or NT
- S
- Declarer vulnerable yes/no
- yes
- Contract doubling: none, double or redouble
- none
- Total tricks taken by declarer side
- 10
- Duplicate-board score from declarer perspective
- 620
- Contract trick points if made
- 120
- Game or partscore bonus
- 500
- Slam bonus
- 0
- Doubled/redoubled fulfillment bonus
- 0
- Overtrick points
- 0
- Undertrick penalty paid to opponents
- 0
Calculation method
Calculation method
Duplicate-board score from declarer perspective
If made sum contract, game/partscore, slam, fulfillment and overtrick points; if down report negative penalty.
Contract trick points if made
Minor 20/trick, major 30/trick, NT first 40 then 30; apply supplied doubling.
Game or partscore bonus
Made contract trick points≥100 earns game bonus 300 nonvulnerable or 500 vulnerable; otherwise partscore 50.
Slam bonus
Bid-and-made small slam 500/750 or grand slam 1000/1500, nonvulnerable/vulnerable.
Doubled/redoubled fulfillment bonus
Made doubled 50 or redoubled 100.
Overtrick points
Undoubled strain trick value, doubled 100/200 by vulnerability, redoubled twice doubled.
Undertrick penalty paid to opponents
Use sourced vulnerability/doubling undertrick table, including escalating nonvulnerable fourth and later doubled undertricks.
Symbols and units
- a
- Contract level above six tricks
- b
- Strain C, D, H, S or NT
- c
- Declarer vulnerable yes/no
- d
- Contract doubling: none, double or redouble
- e
- Total tricks taken by declarer side
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Standard duplicate-board contract scoring from supplied final contract and tricks. This is not rubber/Chicago scoring, matchpoints, IMPs, an auction legality check or a bidding recommendation; passed-out boards are outside this level-1–7 input.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
ACBL: duplicate bridge scoring, including contract, bonus and undertrick rules ↗
Background reading; this does not imply endorsement or independent review of SumFizz.