With Calderwood replacing Pascali with the more defensive Simon Ford and Pressley going for striker Mark Stewart in place of defender Scobbie after 63 minutes, the strategies were clear.
But West Brom's defensive problems got worse on the half hour mark when Marek Cech was caught on the knee by John Pantsil's trailing leg and the Slovakian had to be replaced by Nicky Shorey at left-back.