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Stockfish 6 missed mate in 1 in my game, how likely it is?

It was surprising to me that stockfish 6 could mate me in 2 different ways in the next move but he missed that. Is he making random moves that are good enough? What are the odds of missing mate in one for each stockfish level? On move 77 he could go Bh4# or Bc3# and he just went Bd4. (I was white)

That is very odd, what were the time controls?
It is NOT SF6, it is SF LEVEL 6. Please be careful with your stuff. SF6 was about 1.5-2.5 years ago's best engine (correct me) and that would beat the trash out of SF Level 6.
@savagechess2k sorry, I didn't know that there is a difference. I would edit this post but it's not possible...
I really don't know how Stockfish works, but it seems to me - based on my limited experience - that for, say, Stockfish Level 1, Stockfish plays well, but purposely blunders every so often. Is it possible that is what happened. If not, I would consider it a favor if someone more knowledgeable explains...
See this:
Stockfish Level 6 is SF 8 playing strength lowered to 2000 or something.
SF Level 1 is also SF8 lowered to 1400.
SF Level 8 is normal SF8, maybe devs did somthing to it but I don't know.
Seems like there is some thing wrong. Here is my game against Stockfish AI level 6.
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Time control was 15+16 . But Stockfish did not take even one second thinking time for any single move. See the Move Times graph below analysis board.
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In this game , after Blacks 30. ... Qe5 then white had very easy to find fork 31. Nd3 which would equalize the game very easily. But SF quickly played some other move which lead to losing position.
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It is quite awkward , at 15+16 time control a 1900 strngth player would not miss that fork given that there was no time pressure and in clock it had 22 minutes.
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@thibault @lovlas & Other developpers. For your attention :)

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