Unknown Quantity, a 4-year-old gelding owned by...

Unknown Quantity, a 4-year-old gelding owned by Queen Elizabeth II of Great Britain, won the $200,000 Arlington Handicap by three lengths at Arlington International Racecourse in Arlington Heights, Ill. Unknown Quantity, with Jorge Velasquez aboard, covered the 1 1/4-mile grass course in 2:11 2/5. Frosty The Snowman was second, and Delegant, a 23-1 longshot, finished third.