Techniques by declarer
trumping or ruffing and crossruffing establishing a long suit finessing ducking blocking and unblocking managing entries maintaining tempo drawing trumps not drawing trumps
Advanced techniques by declarer card reading, also known as counting the hand dummy reversal endplay coups squeezes suit combinations play safety play applying the principle of restricted choice applying the theory of vacant places applying percentages and probabilities
Techniques by defenders making the opening lead signaling unblocking overtaking holding up.