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The list of leading Thoroughbred racehorses contains the names of undefeated racehorses or those horses which had an outstanding race record. Ever since English Thoroughbreds commenced racing, the aim was to find the fastest and best. A good consistent racehorse typically requires ability and stamina or speed in varying degrees to defeat its contemporaries. However, time tests are unreliable as a good basis for comparisons between horses of different eras. Time variations may occur as a result of using hand-operated stop-watches, track conditions, wind direction, etc., which make timing an unreliable judging criterion. Thoroughbred Winning Brew holds the Guinness world record for the fastest speed for a racehorse, at 70.76 km/h (43.97 mph) over two furlongs,〔(【引用サイトリンク】title=Fastest speed for a race horse )〕 although Quarter Horses average higher speeds than Thoroughbreds. The two main forms of Thoroughbred horseracing are flat racing and hurdle or steeplechase (jumping) races over obstacles. Winning all three of the three-year-old Triple Crown races is a rare achievement and is considered one of the greatest accomplishments for a Thoroughbred racehorse. Below are listed most of the leading horses of the world’s racecourses for over two centuries. ==Undefeated horses== Federico Tesio bred several undefeated champions including Nearco, Ribot, Braque, and Cavaliere d’Arpino, whom he considered the best horse that he ever bred.〔Talmadge Phelps, John and Frank , ''Dormello-Olgiata, 1961–1962'', Derby Publishing Co., Milan, 1962.〕 Below is a list of Thoroughbred racehorses with an undefeated race record. * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of leading Thoroughbred racehorses」の詳細全文を読む スポンサード リンク
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