Pianola Plus gives you a summary of boards you both bid and played well, boards you both bid and played pooly, and boards where one was good and one was poor.
Each quarter of the chart shows the combination of good / bad bidding or card play:
Board numbers that are shown in white are the boards where you were dummy (so not responsible for the card play!)
The chart for the top third shows what percentage of boards fall into each of those categories for the players who were ranked in the top third for this game. This example shows a typical result for a matchpoint-scored club game. It shows that winning players tend to play the cards very well, even if their bidding isn't necessarily very close to the double dummy. Here. 55.56% of boards fall into the 'bad bidding' category, whereas only 17.78% of boards are classed as 'bad play'.