how to win tournaments ?

hey everyone i recently played in an irl tournament consisting of 9 games of 12/3 with a break every 3 games and was actually doing good for the 4 first games winning 3 and drawing one but see after the fifth game (which i lost) i started blundering in ALL MY GAMES even going up to losing after having played 2 illegal moves in my last game .

so my question is :

"how to improve my chess concentration on a long time period"

good question, practice for longer periods of time, as simple as that, your brain adapts to the longer periods of, stress increasing the duration for your strain threshold, thats the best ive got

ty

Uwlc, lemme know how ur next tournament goes

Thanks for the info.

Win games