To help track the reasons why a mistake was made during the game.
1. Not enough sleep
2. Headache, cold, etc.
3. Food problem: hungry, ate too much, too much sugar, etc.
1. External distraction (noise, light, etc.)
2. Internal distraction (worried about prior mistake, other issues, etc.)
Lack of familiarity with tactical pattern
1. Visualization – did not correctly retain piece position in analyzed (possible) sequences
2. Board vision – did not see entire (current) board properly and missed a move capability
Thought Process Error
1. Hope Chess – did not attempt to look for opponent’s dangerous replies
2. Analytical error – miscalculation/missed sequence
3. Quiescence error – stopped analyzing too soon
4. Did not look for all the things a move did
5. Did not look for a better move
6. Opponent’s move was forced so did not look for its threats, too
Time Management Error
1. Played too fast
2. Got into unnecessary time trouble
3. Panicked trying to avoid time trouble
1. Underestimated opponent
2. Excessive fear of opponent
3. Overconfident in winning (drawn) position
Source: Dan Heisman