Many are predicting one of the tightest-run Longines International Jockeys Championships in recent memory at Happy Valley on Wednesday night.Jockey Club bookmakers installed Zac Purton a $5 favourite and he remains that price, while Ryan Moore has been backed in from $6.50 to $5 and Damian Lane ($6.50), Joao Moreira ($7.50) and Alexis Badel ($9) are the others at single-figure quotes.There are four races with 12 points ha