*decisionthreshold=0.86
<(&/,(^pick,{SELF},a),(^pick,{SELF},b)) <|> <{myNewOp} --> [called]>>.
<{myNewOp} --> [called]>! :|:

Result:

  IN  SetDecisionThreshold(0.86)
  IN <(&/,(^pick,{SELF},a),(^pick,{SELF},b)) <|> <{myNewOp} --> [called]>>. %1.00;0.90%
  IN <{myNewOp} --> [called]>! :-4: %1.00;0.90%
 EXE $0.24;0.04;0.86$ ^pick([{SELF}, a])=null
 EXE $0.24;0.00;0.14$ ^pick([{SELF}, b])=null