The classical theory was that a cricket ball swings only when new and shiny. Pakistan's bowlers, conditioned to abrasive subcontinental pitches and rough outfields, discovered that an old ball with one side kept dry and shiny and the other roughed up could be made to swing in the opposite direction to the conventional in-swinger — fast, late and around the batsman's leg stump. Sarfraz Nawaz is widely credited as the inventor; Imran Khan refined and propagated the technique through the 1980s; Wasim Akram and Waqar Younis perfected it into a coordinated weapon by the end of the decade. The technique was viewed with suspicion by English and Australian players, who alleged ball-tampering, until eventually the wider game accepted reverse swing as a legitimate and dominant skill. By 1992, Pakistan's Wasim and Waqar would dismantle England in England with reverse swing — but the seed had been sown in the early 1980s in Karachi, Lahore and Faisalabad.