Wonders of Tail-chaining

Here is something to ponder about:

If you realize that the colour you want to destroy isn't here for quite some time, you decide to extend it, or try to do a tail chain?

Anyway, look at the right-side of the picture I'm doing. It may look redundant, but if you had looked carefully:

1. When the lower yellow puyos are gone, 2 lower green puyos drop 1 space, thus having others above it to drop.

2. Once the lower green puyos are gone, the upper puyos drop 3 spaces, and the red puyos and the upper puyos drop 1 space before dropping another 4 spaces after the red puyos are gone too.

3. Calculating, the far lright column drops 1 space assuming that the lower puyos disappear. That means, the upper yellow puyos will pop, followed by blue (position of the puyos are quite important.) and green.

So, that's the wonder of tail-chaining. The only thing to remember is:

1. Roughly count the number of spaces the upper puyos will fall on both columns.
2. Carefully place the puyos you want to destroy from up to down.

This is what you should get: