In spare set #457 the ten leaves come in this order: 3, 1-3-9, 3-5-6, 4-7, 7, 4-5, 2-4, 1-2-4, 5-6 and 5. One ball for each, and every clear counts.
We rolled each of these leaves 48 times with the Hard computer's aim and errors. On this set it cleared 21.3 out of 48 on average. The kindest leave here is the 3 pin, cleared 38 times out of 48; the toughest is the 5-6 leave, with only 7.
The set includes a corner pin (4-7 leave and 7 pin). Shoot it from the other side of the lane so the ball crosses towards it at an angle. The widest leave, the 3-5-6 leave, has pins far apart across the lane; it needs a pin to slide across and take the other. Clusters of three or four pins (1-3-9 leave, 3-5-6 leave and 1-2-4 leave) fall to a ball aimed at the pin closest to you.
A mixed set. Take your time over the wide leaves; the single pins are where you make up for them.