I agree with the OP. The sandbagging from years ago was rampant. The scratch leagues in our area always had an eye on the kid practicing, getting better. It was usually a younger guy or girl averaging 175-185 with an old ball, bowling in a mixed handicap league. People would spot them and tell them to keep it at around 178, 179, etc. The next fall the guy or girl, breaks on the scene and average 195, and that team was near the top.
The handicap league, even though its capped, doesnt get as much. After 9 games in our league the averages are set, so the good (sandbagger)bowler can hide for 3 weeks only.
In spite of this, I do miss the old days. And I miss the action of our scratch classic leagues.
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A half ten is not a great shot. No, you shouldn't have carried it.