For each lead, look at the double dummy analysis. The lead is either "Good" (does not give up a trick against double dummy) or "Bad" (gives up a trick).
The term is abbreviated as DD OL% or DDOLAR, pronounced "Dollar".
Top experts in IMP play average just under 81%.
ACBL club players in MP play average just under 80%.
Any value above 85% is suspicious; however you must also look at the number of boards being analyszed. Someone who has a DDOLAR of 90% with 20 boards is far less suspicious than a player with a DDOLAR of 85% over 300 boards.
Examples: Eric Rodwell DDOLAR is 82.07%, Jeff Meckstroth is 80.17%
DCER: Declarer error rate (%)
For every card played by declarer, including cards called from dummy, compare the card played against double dummy analysis. The card is either "good" or "bad" (gives up one or more tricks).
The declarer error rate (DCER) is the percentage of "bad" cards against the total number of cards played.
The DCER is be affected by the speed of a player's claim. A player can manipulate their DCER by playing out the hand instead of claiming when they should.
DCWER: Declarer weighted error rate (%)
The declarer weighted error rate (DCWER) ignores the issue of the speed of the claim.
DCWER is similar to the DCER except it assumes that there are 24 cards played by declarer in every hand. The play to the thirteenth round is fixed. Declarer calls cards from both dummy and her own hand.
For every card played by declarer, including cards called from dummy, compare the card played against double dummy analysis. The card is either "good" or "bad" (gives up one or more tricks).
The weighted error rate is the percentage of "bad" cards against the (number of boards played * 24).
World class DCWER is under 1.80%, for example, Eric Rodwell is 1.73%, Jeff Meckstroth is 1.78%.
DFER: Defensive error rate (%)
The defensive error rate (DFER) uses the same calculations as the DCER except it is on defensive play and it ignores the opening lead.
DFWER: Defensive weighted error rate (%)
The defensive weighted error rate (DFWER) uses the same calculations as the DCWER except it is on defensive play and it ignores the opening lead.
The weighted error rate is the percentage of "bad" cards (ignoring the opening lead) against the total number of possible cards played per board. For the opening leader, there are 11 possible cards, for the partner of the opening leader, there are 12.
World class DFWER is under 1.20%, for example, Eric Rodwell is 1.05%, Jeff Meckstroth is 1.19%.