Here is a list that I put together a while back. Perhaps you will find it helpful
1. Concentration errors
Forgetfulness is the biggest concentration error:
-Forgetting what cards were played.
-Forgetting what partner’s signal was.
-Not remembering how a suit split.
-Forgetting if a trump is out.
The facts for Case 1:
• We were a first time partnership.
• We weren’t planning on playing in the event together and found out the night before.
• My partner is a good player with high national finishes
• We had firmly agreed to play systems on over suit showing doubles and ...