New penalty format: Uefa to trial alternative 'ABBA' system for

Uefa will trial an alternative system for penalty shoot-outs.

ABBA penalty shootout trials yield a more fair, balanced format

Fifa rule out 'fairer' ABBA system for penalty shoot-outs

Soccer Penalty Shootouts: Complexity versus Fairness

New ABBA penalty shootout system to be used in all EFL

Penalty shoot-out (association football) - Wikipedia

ABBA penalties: What is the Carabao Cup penalty shoot-out system

Soccer Penalty Shootouts: Complexity versus Fairness

New penalty format: Uefa to trial alternative 'ABBA' system for

World Cup penalty shootout rules: How it works, ABBA system or

The fairness of long and short ABBA-sequences: A basketball free

Penalty shoot-out (association football) - Wikipedia