Stroke A is a more upward stroke, and will give a return that has more upward speed and less forward speed. The opponent will see this as a slower, high topspin.
Stroke B is a more forward stroke, and will give a return that has more forward speed and less upward speed. The opponent will see this as a faster, low topspin.
Remember that both balls are equally spinny. So this means that a ball that is coming at you faster and lower is not necessarily less spinny than a ball that is coming slower and higher. Tricky stuff!
Now that you know how spin works and how to create your own, let's move on to how to use it properly.
