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Originally Posted by Baundule
Muralis wrist actions are also different for normal deliveries and doosra.
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The key point. Thank you
Baundule ...
"Muttiah Muralitharan is the greatest ever exponent of this type of delivery" - Wikipedia on Murali's doosra.
Murali is double-jointed, a genetic anomaly which allows extra jerk and rip during release. Simply put, he can bend his wrist all the way,
both ways, with incredible results. Add this particular enhancement, as well as his bent elbow, and intelligent trap setting to the traditional techniques, you find yourself at the wrong end of an incessant variation of deliveries only
he is in control of. Now think of this and add it to the following excerpts from Wikipedia, what you have is nothing short of inevitable death for most batsmen -
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Technique
The bowler delivers the ball with the same finger action as a normal off break, but cocks the wrist so the back of the hand faces towards the batsman. This gives the ball spin in the opposite direction to an off break, causing it to spin from the leg side to the off side to a right-handed batsman.
The doosra is the off-spinner's equivalent of the leg-spinner's googly, which spins in the opposite direction to the leg spinner's stock ball. In principle it is possible for a left-arm orthodox spinner (whose action mirrors that of an off-spinner) to bowl the doosra, which in this case would turn from off to leg. This has not yet been seen in international cricket, although the England left-armer Monty Panesar claims to have bowled it in domestic matches."
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Muttiah Muralitharan
Muralitharan's doosra was the subject of an official report by match referee Chris Broad during Australia's tour of Sri Lanka in 2004, for illegal straightening of the arm at the elbow during the bowling action. Subsequent biomechanical tests conducted at the University of Western Australia in Perth showed that Muralitharan was straightening his arm by angles of up to 10 degrees when bowling doosras, well outside the International Cricket Council acceptable guideline of 5 degrees for spin bowlers. Muralitharan was subsequently instructed by Sri Lanka Cricket not to bowl the doosra in international cricket. In November 2004, the International Cricket Council conducted more research into illegal bowling actions and found that many bowlers whose actions were considered legitimate were actually transgressing the rules. A rule change was proposed and accepted at a meeting of ICC chief executives in early 2005, stating that any bowler may straighten their arm up to 15 degrees, and Murali's doosra once again became a legal delivery.
In February 2006, in an attempt to silence the Australian crowds and their 'no ball' chants, Muralitharan took another test at the University of Western Australia, which saw all of his deliveries deemed legal, including the doosra."
Link:
http://en.wikipedia.org/wiki/Doosra