Will a losing system become profitable if it is reversed?.

I read the conference of the best teachers of exchange trading on iLearney today
http://www.ilearney.ru/conf/sistema/

I was interested in the convincing and categorical answers of teachers to the question of a certain Arseny:
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Question:

Arseniy 22 August c 10:38 #
I myself am trying to create trading systems. When I tested one of them, got the worst result 24 thousand. points, and was in the purchase. Вопрос такой: in theory, if I did everything the other way around, that is, under those conditions, opened short positions, then I would earn 24 thousand. points? Is my system working?, if you do everything the other way around from what was originally planned?

Answers:

Dmitry Buber, Частный trader, iLearney instructor
Unambiguously – Not

Sergey Mityukov, Private trader, iLearney instructor
Testing the system is not equal to its online application. You can get exorbitant values ​​on tests, but faced with the same situations online, you will suffer loss after loss. Therefore, the results in the testers can be sent directly to the washroom.. Only online testing will allow you to get an answer, what are you a trader. Если вы получаете -24 thousand. points, then by changing the parameters you can get -48 thousand. Why should the result improve?? If you run 100 march with the best sprinters on the planet and get the worst result, then running in the next race in the opposite direction, your result will remain the same, only the stands will laugh and nothing more.

Denis Kovacs, Private trader, iLearney instructor
Such experiments have already been carried out more than once., when they took the robots (record holders in the plum) and flipped the algorithm, so that instead of buy, sells open and vice versa. In the end, there was still a drain! This has already been proven by statistics., you can google and see for yourself)

Alexander Purnov, Private trader, iLearney instructor
I am extremely negative about the results of testing various strategies, since this proves absolutely nothing. Когда мы видим schedule left, everything is clear and understandable to us, when it is necessary to make a decision on the deal on the right side of the chart. this is where the weak link of any trading system appears: the moment of making the decision to enter, after all, the price will pass through some significant level more than once or twice back and forth, accordingly, the same number of times in the trader's head will sound notes of doubt about the deal. This is the risk, because the deal must be done `` here and now '', because then it will be too late and there will be a completely different trading situation.

  The property

Dmitry Demidenko, Private trader, iLearney instructor
Agree with Alexander. Testing says nothing.
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Strange. А вот у меня, personally, if I take a losing system and turn it over, then I get profitable. And vice versa. Of course I mean excluding commissions…..  Probably, I still misunderstand something that the teachers of trading with iLearney understand. :( 

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