How do you solve the oslik puzzle

You have to move the yellow square to the bottom of the screen by maneuvering the other blocks around it. Sliding the small blue blocks together will let you move the larger red blocks out of the way.

*There is an entire collection of these puzzles (originally wood) called Klotski, which were distributed with 32-bit Windows Entertainment Packs. Neither Oslik nor Klotski have been adapted for 64-bit systems.