It depends on how the computer moves, if the computer makes three really stupid moves, you could wipe it out in three moves, but it usually only makes two stupid moves, and even if you get it down to one peice, it soon makes more.
I got a 40 earlier today, but I have never been able to replicate my 43 since I got it, or come close to the pingo score either, dosnt help that that one has randomly places mines so even the exact same hit will produce different results.