What is the percentage of game won in current format of alternating penalties for team going first in top European football competitions?
Main reason for asking this question is ABBA system for penalty shootout. Which was recently used in FA Community Shield match between Chelsea and Arsenal. In this system, the order of penalties would see the the team going first in the shootout taking one spot-kick before their opponents take two in succession. (Trial system for penalties)
The reason for this new system is, to reduce the potential advantage that the team taking a first penalty in a shootout have. IFAB says that the experiment follows growing evidence that the current penalty shoot-out system, as laid down in the Laws of the Game to determine the outcome of a match, gives an unfair advantage to the team taking the first penalty in each pair of spot kicks.
Study of Mr. Ignacio Palacios-Huerta, Professor, London School of Economics, shows that new ABBA format cuts down advantage to 54%. While many articles claim that, in current format of alternating penalties team going first wins 60% of time. And answer to this question will help to find out if the reason for this change is justified or not.