That concern is addressed by the requirement to break forcefully (or by 3-point rules).... On the other hand we don't want to see the game become like straight pool, where the break becomes a liability and they start playing safety breaks after getting a few racks up to help protect their lead. ...
I agree. Anything from 1/4 to 1/3 of the games sounds about right. And that would be for the aggregate of a bunch of matches. The guys finishing at the top of the events would often be doing better than that.... Personally I think a 27% BNR stat is just fine. ...
I just wrote this in the previous post: It's also worth remembering that the overall 50% figure for games won by the breaker came from guys who won the matches, at 59%, and guys who lost the matches, at 39%. I.e., some of the players did have an edge.... I am concerned, however, about the breaker not having any edge at all. I wonder if that is due to the high frequency of scratches by cutting the rack so much.
And, yes, scratches on the break were quite high for this event, probably at or near the top for the events I have tracked. 24 of the 223 games were fouled on the break (10.8%) The breaker won just 2 of those 24 games, so if he had won half (12) instead of 2, it would have added 10 the the count for breaker won game, taking that stat to 55% instead of 50%. The matches I tracked for the 2021 International Open, with similar equipment and rules, had a 6.6% foul rate on the break and an overall 51% breaker-won rate. But they were contending with a 3-point rule, which causes a lot of game losses for the breaker.