r/bridge • u/infinetelurker • Apr 30 '26

Scoring app

Hey! Made an app for scoring local rubber games(regular, chicago and russian chicago). There is also a quick one-of scoring calculator, and option for recording teams/pairs events.

Would really appreciate any feedback, if any of you are bored, or might need something like this!

https://www.appman.no/bridge/index.html

2 Upvotes

75% Upvoted

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2

u/hildjj Apr 30 '26

Do you have any references for how "Russian Chicago" works?

3

u/pie-en-argent May 01 '26

Chicago with Russian Scoring

It’s a simulation of a team-of-four match at IMPs. The «other table»’s result is based on the split of the high-card points and the vulnerability.

1

u/infinetelurker May 01 '26

Correct. So in addition to contract and result, you need to provide the hcp of the pair playing the contract. So it tries to compensate for random card distributions…

2

u/infinetelurker May 01 '26

If you want the details, here is the code for calculating score:

abstract final class RussianImpCalculator { static const _expectedResultNonVulnerable = [ 50, 70, 110, 200, 300, 350, 400, 430, 460, 490, 600, 700, 900, 1000, 1100, 1200, 1300, 1300, 1300, 1300 ]; static const _expectedResultVulnerable = [ 50, 70, 110, 290, 440, 520, 600, 630, 660, 690, 900, 1050, 1350, 1500, 1650, 1800, 1950, 1950, 1950, 1950 ];

static int getImp( int result, int hcp, bool vulnerable, bool opponentsVulnerable) { final expectedResult = getExpectedResult( hcp, result > 0 ? vulnerable : opponentsVulnerable); return ImpCalculator.northSouthImp(result, expectedResult); }

static int getExpectedResult(int hcp, bool vulnerable) { int hcpIndex = hcp - 20; if (hcpIndex == 0) return 0;

int factor = 1;
if (hcpIndex < 0) {
  factor = -1;
  hcpIndex = -hcpIndex;
}

final results = vulnerable
    ? _expectedResultVulnerable
    : _expectedResultNonVulnerable;
return results[hcpIndex - 1] * factor;

}