# Doppelkopf Score Calculator

> Doppelkopf game points from card points, announcements and special points (DDV rules). Scores one game of Doppelkopf by the tournament rules of the Deutscher Doppelkopf-Verband: who won (121 for Re, 120 for Kontra, shifted by announcements and Absagen), the plus-minus points for winning, against the Queens of Clubs, under 90/60/30, Schwarz, Re/Kontra (+2 each), every Absage, reaching 120/90/60/30 against an Absage, and the special points Fox caught, Karlchen and Doppelkopf in normal games. A soloist scores three times. The Playcards app scores every game with the same function.

Part of usefulweb.app (https://usefulweb.app/). Part of [Playcards](https://playcards.usefulweb.app/) (ownerApp: playcards). Results are deterministic calculations from the inputs and the listed assumptions; the API returns exactly what the web page shows.

## Use it
- Human interface: https://playcardsdoppelkopfscore.usefulweb.app/ (interactive tool at https://playcardsdoppelkopfscore.usefulweb.app/tool)
- JSON API: POST https://playcardsdoppelkopfscore.usefulweb.app/api/v1/calculate with a JSON object of inputs (schema: https://playcardsdoppelkopfscore.usefulweb.app/api/v1/tool)
- OpenAPI: https://playcardsdoppelkopfscore.usefulweb.app/openapi.json
- MCP (Streamable HTTP): https://playcardsdoppelkopfscore.usefulweb.app/mcp - tool `playcards_doppelkopf_score`

## Inputs
- solo (boolean): Solo (Re is one player)
- reAugen (integer): Card points of the Re party - Kontra has 240 minus this.
- reTricks (integer): Tricks won by Re
- kontraTricks (integer): Tricks won by Kontra
- reAnnounce (select): Highest announcement of Re
- kontraAnnounce (select): Highest announcement of Kontra
- reFox (integer): Foxes caught by Re
- reKarlchen (integer): Karlchen for Re (last trick won with the Jack of Clubs)
- reDoppelkopf (integer): Doppelköpfe won by Re (tricks with 40+ points)
- kontraFox (integer): Foxes caught by Kontra
- kontraKarlchen (integer): Karlchen for Kontra
- kontraDoppelkopf (integer): Doppelköpfe won by Kontra

## Method
- Winner (DDV 7.1): Re needs 121 card points, Kontra 120; if only Kontra was announced, Re wins with 120 and Kontra needs 121. A party that said keine 90/60/30 needs 151/181/211, after Schwarz every trick; the other party then wins with 90/60/30 or one trick. If both parties fail their Absagen, nobody wins.
- Points (DDV 7.2): won 1, against the Queens of Clubs 1 (Kontra wins a normal game), under 90/60/30 and Schwarz 1 each, Re and Kontra announced 2 each, every Absage 1, reaching 120/90/60/30 against an Absage 1 each (also without a winner). Special points (normal games only): every fox caught, Karlchen and every Doppelkopf 1 for the party that made it; they are set off against each other.
- Plus-minus scoring: each Re player gets the value, each Kontra player its negative; a soloist gets three times the value.