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The Block Donut Rule is going around to the ''right'' side of the blocks and moving block 2 L, then pushing block 1 U and 3L into a bomb. The two paths form a donut, which gives the rule its name. Compare this to starting by pushing block 2 R from the left side. While the Block Donut Rule's path is initially 2 moves longer, it places the block 2 spaces closer to its target, saving ''four'' moves, and thus gaining two moves net. Not all situations trade the two moves; sometimes, Chip will already be on the opposite side, and therefore the Block Donut Rule will be worth four extra moves. | The Block Donut Rule is going around to the ''right'' side of the blocks and moving block 2 L, then pushing block 1 U and 3L into a bomb. The two paths form a donut, which gives the rule its name. Compare this to starting by pushing block 2 R from the left side. While the Block Donut Rule's path is initially 2 moves longer, it places the block 2 spaces closer to its target, saving ''four'' moves, and thus gaining two moves net. Not all situations trade the two moves; sometimes, Chip will already be on the opposite side, and therefore the Block Donut Rule will be worth four extra moves. | ||
However, the Block Donut Rule is ''not'' usable in situations where the push physically closer to the target will impede [[Chip]]'s pathway, or cause the block to be either technically further away from its target or completely unusable. | |||
[[File:Block Donut Rule 2.png]] | |||
Here, after Chip collects the [[yellow key]] and removes the [[yellow lock]], then removes [[water]] one, the Block Donut Rule cannot be used, as this would trash block three. Instead, move block three L, block two to water two, and block three out to the water. Note that the [[rule of double bridges]] and [[rule of turning bridges]] are ineffective with this setup, as this would require a waste of two moves to set up. | |||
One noticable example of the Block Donut Rule in actual play is in the five-block room in the southwest of [[Mix Up]], after three of the blocks have been removed. There is a stack of two blocks in the center of the room, and moving the lower block L rather than R yields an equivalent situation to example one. | One noticable example of the Block Donut Rule in actual play is in the five-block room in the southwest of [[Mix Up]], after three of the blocks have been removed. There is a stack of two blocks in the center of the room, and moving the lower block L rather than R yields an equivalent situation to example one. | ||