The Left-arm orthodox spin reference article from the English Wikipedia on 24-Apr-2004
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Left-arm orthodox spin

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The left handed equivalent of Off spin bowling in the sport of cricket. As a rule, it is harder for a right-handed batsman to play than offspin as the ball spins away from the batsman. However, it is not considered as difficult to play as Leg spin due to the (generally) smaller repertoire of delivery types. A good example of the effectiveness of this is the bowling of Daniel Vettori, a current New Zealand player.