After seeing the first game, I'd reccomend you look up mating a lone king with your rook and king. What if that'd happened in a tournament and the other player took advantage of your lack of knowledge?
2 Good Games
If you need help, please contact our Help and Support team.

These are 2 live games I played here. The first game was 20 minutes. the second game was 15 minutes with a ten second increment. In the both games I was in some time trouble. Hope you like them!