The left-arm jinx is a mental one
After Kevin Pietersen was again dismissed by a left-arm spinner on the fourth day in Cardiff, Vic Marks' verdict, in the Guardian , is that he has developed a mental block
My impression is that Pietersen is not really technically deficient against left-arm spinners but he has become unnerved by them, something he would vehemently deny. On the very brief evidence of Sunday there is one shot that he declines to play against them now, and that is the forward defensive.
Dustin Silgardo is a former sub-editor at ESPNcricinfo