Suppose the bidding goes 1♠-2♠-2NT. This is a general invite (or balanced GF) upon which North can bid values, 3♠, 3NT or 4♠. You may want to know on what type of hands North should accept game or bid 3NT or 4♠. Another example is that you want to know if you should double them or bid your own game. Bridge Compass offers a solution for various final contracts. It is called the technical mode.
The technical mode is available on the invite tab (bidding decisions) and for North only. On the pattern screen you can assign each pattern to a specific contract. This is on the bottom of the 'More' tab. When deals are generated, they are always coupled to the (first) pattern that matches so that makes it possible to show them in the grid. E.g., we define 4 patterns. With weak hands North will bid 3♠, with a 4333 and max North bid 3NT. With 7-8 unbalanced and any 8-10 (not a 4333) 4♠. With an unbalanced hand South will always correct 3NT to 4♠. So we give South 16-18HCP and any 5332. This is how the screen looks.
The pattern number is shown in the grid right after the contract. You can check what happens if you change the 3NT-bid definitions or change that bid to 4♠. Also you could add a 6 count with a singleton. A lot of things to dive deeper. The numbers of the hands dealt give a good (relative) indication of the frequency the pattern occurs.
The second example is more complex. The next hand came up in the Dutch team. You got this: ♠ 9 5 2, ♥ A 7 4, ♦ A 9 3, ♣ A K 7 6. LHO opens 1♥ and RHO who is white against red raises to a weak 3♥. What do you do?
3H will probably go down but you might miss a game. But partner didn't overcall 1♠. Partner did not gave a take-out double too. With an 11 count it is almost 100% and with some 10 counts it is quite normal. But even on less values it might be a game. Partner can have 55 in the minors and be far to weak for a 2NT overcall. The technical mode can give an insight.
A lot of information on this screen. There are 10 technical bids defined for North. The 11th is an exclude pattern: all hands with 5♠ and 6 HCP or more. An excluded pattern isn't really necessary as long as you fill in all hands that North may have. There is no 4♠ bid amongst the patterns. If North doesn't overcall 1♠ the assumption is that the hand isn't worth a jump to 4♠ either. There are several NF bids like 3♠, 4♣ and 4♦. F.i., 3♠ can be bid with 0-5 and 5♠. Or 4♠ and less then 7HCP. With 7 HCP or more and 4♠ North can cuebid 4♥. The hand pattern is something like a 5431, 4441, 5440, 6421 etc. Just strong enough to try for a vulnerable game if partner doubles in this situation and you don't have an invitation available. But what you do is arguable. 7 HCP with a bare K isn't worth a cuebid. But if you make this perfect, the result doesn't change much. The 4♥ cuebid will lead to 5♣ or 5♦ (46). With 55 in the minors and strong enough, North can bid 4NT which will lead to 5♣.
The final result is shown at the line with totals which indicates that a Pass is best. The 'X if -2' is checked. If it is unchecked it is still negative (-0.57). This conclusion doesn't count for auction 1♠-P-3♠. In that case North can easily have hearts and too weak for a vulnerable overcall at the 2-level.
As you can see the X only applies to game contracts. Another interesting point is that you can define the A and B contract for EW as well. It is not possible to enter technical bids for them.