The men's 800 metres at the 2012 IAAF World Indoor Championships will be held at the Ataköy Athletics Arena on 9 and 11 March.
The gold medal was won by 18-year-old Mohammed Aman of Ethiopia, in a time of 1:48.36 seconds.
Jakub Holuša had run the fastest time in the semi-final (1:47.23) placing in front of the gold medalist, Mohammed Aman.
At the 400 metre mark Kszczot was still winning the race after coming through with a time of 56.29 seconds.
Kszczot kept his lead until the 700 metre mark where Mohammed Aman made a move and overtook him.