Tripping the guy while he's busy kicking your head.
Sort:
Your move no. 20 is a blunder. You for sure will get checkmated. I will just show it to you. Congrats for the win. Your opponent did not see the right combination.
Actually your opponent could have still checkmate you if he had choose the correct move in his move no. 24 but instead he the chosed the wrong option.
24...... Qe1+
25. Qf1 Qg3+ (also threatening checkmate at Qh2)
26. Qg2 Re1#