THURSDAY EVE PRO-AM PAIRS - SEPTEMBER 17, 2026
Thursday Evening - Anchorage Bridge Club

4 pairs - 1 all-direction scoring field
All: 4 pairs, 18 boards; C=1 on every board; omega=0.230769 per pair

Mean player rating:       1339.8 -> 1339.7
Mean partnership rating:  1334.4 -> 1334.3

ALL-DIRECTION FIELD

PAIR                                       PRE RATINGS       EXP    ACT   PERF     POST RATINGS
Mark Desinger - Thomas Smith            1686 -1354?: UNR    57.31  61.11  1668   1688 -1360?:1524?
Lynn Cason - Lisa Fitzpatrick           1252 -1167 :1201?   44.72  50.00  1334   1255 -1169 :1205?
Helen Desinger - Brock Steller          1197 -1420?: UNR    49.02  44.44  1168   1195 -1414?:1305?
M Lynne Smith - Craig Valentine         1392 -1249 :1307    48.96  44.44  1168   1390 -1247 :1304

EVENT DIAGNOSTICS
                 RMSE    MAE   MSE SKILL   CAL SLOPE
3.5 Official    4.572  4.542      54.8%       1.109
3.4.1 Legacy    4.738  4.696      51.5%       1.054
Null (50%)      6.804  5.556       0.0%         N/A

SOURCE INTERPRETATION
The ACBLScore GAME>VICTORY POINT header is a miscoding. The board table contains ordinary
matchpoints (0, 1/2, 1) from two results per board, and the Score totals are 9, 11, 8, and 8.
ACT is therefore Score / 18: 50.00%, 61.11%, 44.44%, and 44.44%.

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,
and calibration slope 1.000 is ideal.