Less fancy hack here, intercept the prediction function on every punch and force the frog to take the opposite side. const realPunch = punch; punch = function(

Less fancy hack here, intercept the prediction function on every punch and force the frog to take the opposite side. const realPunch = punch; punch = function(myMove) { oracle.predictNextPunch = function() { return myMove === 'L' ? 'R' : 'L'; }; realPunch(myMove); };