FRIDAY AFTERNOON PAIRS - SEPTEMBER 18, 2026
Friday Afternoon - Anchorage Bridge Club

5 pairs - 1 one-winner scoring field
One winner: 5 pairs, 24 boards per pair; 30 boards in play

Mean player rating:       1430.5 -> 1430.7
Mean partnership rating:  1416.4 -> 1416.6

ONE-WINNER FIELD

PAIR                                        PRE RATINGS       EXP    ACT   PERF     POST RATINGS   
Monica Roberts - Richard Oldford         1597 -1705 :1650?   57.99  58.33  1666   1597 -1705 :1650?
Randy Vanderwood - Amanda M Vanderwood   1255 -1090 :1187    42.12  54.17  1541   1262 -1097 :1198 
Mark Desinger - Paula Zawodny            1688 -1247 :1429    50.45  45.83  1291   1686 -1245 :1425 
Leone Garrett - Helen Desinger           1471 -1195 :1336?   47.09  45.83  1291   1471 -1195 :1336?
Donald Bladow - Carolyn Sprague          1520 -1537 :1480    52.35  45.83  1291   1516 -1534 :1475 

EVENT DIAGNOSTICS
                 RMSE    MAE   MSE SKILL   CAL SLOPE
3.5 Official    6.488  4.955      -51.5%       0.244
3.4.1 Legacy    6.444  4.867      -49.5%       0.273
Null (50%)      5.270  5.000       0.0%         N/A

NOTATION
?    Unestablished at that point
UNR  Player or partnership had not previously appeared in the rating system
PERF Partnership session performance = mean field partnership PRE + 30 * (ACT - 50)
Prediction diagnostics are not omega-weighted.
MSE Skill is relative to the 50% null; calibration slope 1.000 is ideal.

SOURCE AND WEIGHT
Source: Anchorage Bridge Club result 260918A.HTM.
Published scores reconcile to 24 played boards per pair with one actual comparison per board.
Information weight: omega = (24/26) * (1/3) = 4/13 for every pair.