Features include:

0 to 4 players, in any configuration
Rubber, duplicate pairs, teams and 'Chicago'- infinite random deals + 10 million pre-dealt sets
Four bidding systems - Acol, Standard English, 5- Card Majors and Standard American
Switchable conventions - weak/strong/variable NT, weak/strong two bids, and many more
User definable bidding conventions
Explanations for bids and plays
Suggestions for bids and plays
Bidding commentary / "Post Mortem" feature for in-depth bidding analysis
3 play levels
Genuine computer play - no cheating!
End-game solver, featuring detailed statistical analysis of the last (up to) 9 tricks
Several methods for 2+ players to play at one screen without seeing each other's cards
"4th player" mode, enabling OB to make up the four playing at the table with real cards
Network play on a LAN
User definable opening lead style
Full scoring
Hand printouts - choice of graphics or text
Curtain card printouts
"Take back" bids and plays - either "undo" one move or take back to any position
Hand review and replay facilities
Claim / concede options, checked for validity
Hand input / editing tools
Load / save hands (with bidding and play)
Biased deal capability
Double dummy mode
Animated card graphics
Mouse or keyboard control
On disk manual / help facility