BBC Sport explains all you need to know about the sport of hurling ahead of the GAA All-Ireland hurling semi-finals, which are live on BBC iPlayer and the BBC Sport website.
Watch live coverage of Limerick v Galway on Saturday, 8 July at 18:00 BST on BBC iPlayer, BBC Two NI and the BBC Sport website and Kilkenny v Clare on Sunday, 9 July at 16:00 BST on BBC iPlayer, BBC Two NI and the BBC Sport website
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