BinarySoft BDIâ„¢ is a revolutionary new way to trade on Betfair. It uses binary prices, which are much better suited for trading than decimal odds and are also the most natural and intuitive way of expressing odds. [*] BDI is compatible with all Betfair markets and is especially suited to markets with two selections – “binary” markets. All of the bets across both selections are combined into a single vertical ladder-style interface, which means that you can place a bet on the outcome of the binary market without having to worry about which underlying selection you should choose in order to place your bet. Popular binary markets on Betfair include the following:
- tennis game/set/match/handicap markets
- snooker frame/match/handicap markets
- football over/under goal markets
- most financial marketsBDI has been designed for maximum performance and is compatible with any operating system which supports Java, including all recent versions of Windows, Mac OS X and Linux. It is easy to install and updates to the latest version automatically each time the program is started. A 20-day FREE trial is available, with absolutely no obligation to buy! BDI continues to evolve at a fast pace, with the latest v2.1 release adding support for multiple-market monitoring, Stop Loss orders, an If-Filled condition and a TIF (Time In Force) parameter. BDI v2.2 is currently in development and has many new features, including: a highly comprehensive charting package; a “zoom-in” mode for more precise trading; a brand new windowing system allowing a more flexible layout; and full integration with Tradefair, the new binary betting exchange from Betfair.
[*] If the 0-100 prices are “better suited for trading”, and more “natural” and “intuitive”, I’d suggest to BetFair that they:
- scrap their digital-odds trading engine;
- replace it with the TradeFair trading engine.
But I’m such a “radical”. 
“It uses binary prices, which are much better suited for trading than decimal odds and are also the most natural and intuitive way of expressing odds. [*] BDI is compatible with all Betfair markets and is especially suited to markets with two selections – “binary†markets.”
The key here , is the phrase – suited to markets with two selections. I have already pointed out that in markets with more than two selections (and indeed, often in markets with two; where the prices do not sum upto one; then the prices do not represent the win probabilities.
I still do not think that you have got your head around this one?
Decimal odds and binary prices are two equivalent ways of expressing the same thing – the win probability. Also note that BDI is perfectly usable for markets with more than two selections – it is just *especially* suited to binary markets because it can combine both selections into a single ladder-like interface.