The christmas tree is one of four base oil patterns, Flat oil-Block-Reverse block-christmas tree.
Flat oil is where oil is spread evenly across the lane gutter to gutter.
Doesn't really give a advantage to any one style/line, tends to break down into a reverse block situation over time.
A Block is where there is more oil in the middle (usually from 10 to 10) and less on the outside (10 out) of the lane. The Wall and Top hat are nicknames for a block. Good pattern for hook players, because you can throw across the oil and bounce it off the dry outside (the Wall).
A Reverse block is just that, the opposite or reverse of the Block.
On this one you have to play in the middle more, with a break point closer to the pocket, the outside is a Out of bounds due to the heavier amount of oil.
The Christmas tree is where the oil is layed down like a triangle pointing at the head pin.
In the simplest terms, you can play basically any where on a christmas Tree. Because it basically will guide the ball to the pocket. Used a lot for house shots, easy to put down with todays machines.
Most oil patterns are variations of these base patterns.
Look here at the Kegel Pattern Library, this has just about every pattern used today.
http://www.kegel.net/patternlibrary/default.asp
Also look here for more info
http://www.bowlingball.com/BowlVersi...s-tree-pattern
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