Miscalculation
1000 ways one could lose a chess game
being a patzer(my case)
How about lack of time?
Yes maybe
Failing to see an attack coming at you
Acting to quickly and stepping into a trap
great 
What else?
CUI (Chess Under the Influence) ... never play after a glass of wine
Sporty_Meghan wrote:
CUI (Chess Under the Influence) ... never play after a glass of wine
Alexander Alekhine, drinker and World champ would like to know your location
Can be thousands of things...Bad internet connection, kids distracting when someone is playing, a sudden pain for a newly discovered cancer, the neighbor dog barking, and goes and goes...I can say millions of things that can happen...what is your point asking that?
female opponent exposing her breasts cleavage...
If you've more let us know
lol @frankoo
Strong opponent perfume or cologne causing headaches....Bad body odor would fall into that catagory as well....
سوء التقدير وأحيانا سوء النت
you spontanouelsly mutate into a mushroom
female opponent exposing her breasts cleavage...
Reported, blocked
Getting distracted by your girlfriend
Who all could give reasons for losing a chess game
1. Lack of concentration
2....