The Sliding Blocks of Huarong

Can you move the largest block (Cao Cao) from the top centre out through the hole at the bottom of the board by sliding the other blocks out the way? This puzzle will test your patience and lateral thinking whilst helping you to develop great mental discipline.
The characters on the blocks are from one of the most legendary battles in Chinese history, the Battle of the Red Cliffs. The biggest block represents the fearsome Chinese warlord Cao Cao as he flees through Huarong Pass after his defeat. The other blocks represent the battling Chinese soldiers and the board is the battlefield. Help Cao Cao escape through the Huarong Pass by sliding him across the board and out through the step at the bottom – it can’t be done in less than 84 moves!