MSN Gaming Zone - Roman Keycard Blackwood
One of the oldest bidding conventions in Bridge is the Blackwood Convention. Join Fred Gitelman as he explores the convention and shows how it can work for you in online gameplay.

Paul's Bridge Site - My Bridge Stuff
Offers bridge games analysis and discussion on bidding topics; variations on existing and proposed new conventions; summary bidding guidelines and charts.

Bridge Probabilities: How do they Break
Bridge probabilities of breaks.