sentences:  On 28 July he ran in the King George Stakes at Goodwood in which he was opposed by the six-year-old mare Diadem who had won the 1000 Guineas in 1917 before becoming an outstanding sprinter.In what was described as a "spendid duel", Tetratema held off a strong challenge from Diadem to win by three-quarters of a length.Shortly after this race it was reported that McAlmont had refused an offer of £100,000 for the colt which would have more than doubled the highest price ever paid for a British or Irish racehorse.