The least number of moves possible to capture a live unresigned king in chess is 4. This is done by one player moving a piece out of the line of check and the next player capturing the king with the piece whose checking ability has been discovered before the victimized king has a chance of getting out of check. This is why turn sequence is important in 4 player chess. I haven't seen an unstaged 4 move king capture until this one.
har-har! Red queen 
helps you 
vrdtmr and myself happened to seize a milestone opportunity this game:
https://www.youtube.com/watch?v=oJPAd4kBWhE
The least number of moves possible to capture a live unresigned king in chess is 4. This is done by one player moving a piece out of the line of check and the next player capturing the king with the piece whose checking ability has been discovered before the victimized king has a chance of getting out of check. This is why turn sequence is important in 4 player chess. I haven't seen an unstaged 4 move king capture until this one.