It is math behind the calculations and it shows you the correct info, that is the results of calculations performed according to implemented algorithms.
There are some details though going on, which are important in this case, in actual implementations of certain algorithms, like Nash calculation which can lead to slight mistakes, like few hands which are actually slightly +EV not being present in range, or hands being slight -EV being present in some range.
The big problem with your scenario is that with this kind of highly theoretical spot, 9 players, UTG push, all got 10 BB the Nash calculation becomes highly speculative.
You see, performing a Nash calculation assumes that players limit themselves to push or fold decisions preflop. Of-course in 9 table with all players at 10BB it is just not likely that players are in push fold mode, that there will be no minraises or limps (especially as we get closer to BB position).
So analyzing UTG plays with nash calculation and many players is not something I would call useful in the first place. There are big assumptions in place when we are dealing with Nash, and a lot of them are not true in spots like this.
You can learn more about limitations of Nash calculations here:
http://www.icmpoker.com/en/blog/nash...tegy-in-poker/ I also recommend watching a video linked on that page after the article to get a better understanding of the Nash calculation problem, since you seem to be interested in getting to know this topic better.
Remember that in MTTs bubble factor is always greater than 1. So running chipEV calculations is wrong by definition, unless your tournament is winner take all.
So generally the farther the pusher is from the BB, and the deeper the stacks the more speculative preflop calculations become. I recommend to analyze pushes and calls from late positions first, how to defend BB, how to push from SB, BTN,CO,HIJ. Going outside of those positions and getting closer to UTG is not so useful - they are usually very tight. Also they represent much smaller % of bread and butter push fold spots of tournament. (that is, pushes from UTG 9 way happen much less frequently as pushes from late position, even not a really too late position like HIJ).
The mistake which you call "big" given the circumstances, and actual size - just a few pairs showing as +EV while being not +EV vs UTG push is pretty small in my book, and given highly speculative spot type I wouldn't focus too much time on analyzing it in the first place.
Also, the mistake here is actually bigger than in a majority of relevant push fold spots, due to special circumstances, like pusher position. You can check and see for yourself that in pushes from later positions mistakes of this size don't really happen often.
You can get even more speculative results if you increase stack depth to say 20BB.
And btw I also recommend you to check out the article I mentioned earlier, I believe its also relevant to your question:
http://www.icmpoker.com/en/blog/anal...sh-fold-spots/
Remember, that after Nash calculation is performed, there can be some mistakes in ranges (explained in article). To get precise result just hit [Calculate] button.
Last edited by Q; 04-09-2014 at 09:51 PM.