[shadowmint]

Given the number of errors by the AlphaGo in the last 10 minutes, probably the former.

[greenyoda]

I think Lee Sedol won the game earlier by destroying AlphaGo's territory in the center. The commentator (Michael Redmond) was quite impressed with what he did there.

[nanofortnight]

Those moves look like AlphaGo had calculated a loss way ahead of time.

[techdragon]

Sometimes its just not possible to stop the snowball rolling down hill. You cant always turn a retreat into an advance or flanking move, sometimes the first step backwards just turns into a full on rout.

I got the impression (possibly incorrectly) that AlphaGo was trying to throw curve-balls and be 'unexpected' in a way that might have 'forced' a mistake it could exploit.

[calvins]

Errors when already lost don't mean much.

[hoonah]

Given the genius of LSD, probably the latter.