Computer-implemented methods and systems, including a user interface, that (a) calculate and display a graphical representation of a market implied probability distribution for the future prices of a tradable asset, which is derived from real time prices of the options on the asset, (b) permit the user to customize the market implied probability distribution graph to reflect the user's own view on the probability that the future price of the asset will be within a price range, and (c) propose an optimal trading strategy implemented as a combination of option orders, which strategy is optimized to be profitable assuming the customized probability distribution (if any). The combination orders may be modified and/or added to by the user.