Can anyone tell me the correct rule in the following incidents?
1. Play reaches 9th trick when defender realises he has 3 cards in his hand and everybody else has 4 (he has 10 cards on the table whilst others have only 9 on the table).
2. Declarer plays (leads) a card from his hand when it was dummies lead.
3. Defender plays a card before LHO plays his card
4. Defender plays a card before his partner and LHO have played their card (I am reasonably happy with the answer to this (Law 57))
Note: I am not being lazy, I have read the Laws but I can't find an answer for 1 and the answer for 2 and 3 seems too lenient (if I have read it right).