What is the ABBA penalty shootout format? The new spot-kicks

FIFA and UEFA have trialled the system on the international stage and now it will be introduced in the EFL Cup, EFL trophy and playoffs

New ABBA penalty shootout system to be tested

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

The empirical probability that A wins a penalty shootout over five

Uefa: Penalty shootout trial takes place in Euro Women's Under-17 semi-final - BBC Sport

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

Penalty shootouts: Academics find fairer format, but will football accept it?

ABBA penalties: What is the new system? Which cups will it feature in?, London Evening Standard

What is the ABBA penalty shootout format? The new spot-kicks system used at the Community Shield explained - Irish Mirror Online

What is the ABBA penalty shootout format? The new spot-kicks system used at the Community Shield explained - Mirror Online

Are penalty shootouts the fairest way to break football deadlocks?

The alternative penalty shootout for football: Attacker Defender Goalkeeper - Dutch Referee Blog

Arsenal Chelsea highlights, new penalty shootout, ABBA explained