Competitive bridge pair Justin Howard and Peter Hollands are looking to improve. A friend of theirs analyzed their games, comparing both teams' play against double dummy, i.e. against the best line of play given all hidden hand information:
It doesn't help to just think "make more sacrifices because we know we tend to miss good sacrifices." Instead, the players in review try to understand which specific possible sacrifices had been good or bad and why. Stats without context only go so far. These players are using their stats as a lens for reviewing the past games that fed into the stats, not just as a tool unto themselves: