Chess Opening Theory/1. e4/1...d5/2. exd5/2...Qxd5/3. Ke2/3...Qe4

Scandinavian Defence
This happened because white blundered with 3. Ke2??, which allowed a shocking mate with 3...Qe4#.

'''1. e4 d5 2. exd5 Qxd5 3. Ke2?? Qe4#'''