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Per Orach Chaim 693:2 if one forgot Al Hanisim by Davening there is no need to repray. What if I said Al Hanisim, however I said the Chanuka version on Purim - do I have to Daven again or not? (sources)

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Do you have any reason to assume this would be different than saying Yaaleh VeYavo for Shmini Atzeret on Purim? – Double AA Feb 25 '13 at 16:40
It seems to be a machloket achronim. See the end of OC 108 – Double AA Feb 25 '13 at 16:46
@DoubleAA: So it seems like I got a question – Gershon Gold Feb 25 '13 at 16:49
@DoubleAA: This happened to a fellow in Shul on Purim when the Rav was not there and no one seemed to know what he should do. Hence the question. – Gershon Gold Feb 25 '13 at 16:59
Presumably, the question of שח בתפילה applies to the bimei Matisyahu/bimei Mord'chai section just as it applies to ya'aleh v'yavo. (Independent of that, however, it is possible that the first part of al hanissim serves some function even without the day-specific part, depending on the function of al hanissim. In general, though, I'm not sure if there would be a nafka mina in a case where someone said only the beginning part and forgot the rest.) – Fred Feb 25 '13 at 22:59
up vote 2 down vote accepted

The Rivevos Ephraim 1:457 brings the tzaddim of both sides,he ends off that one does not go back. Rav Shmuel Kamentsky in Kovetz Halachos 7:5 holds one is yotzei and doesn't go back.The tzad that says that chanukka has a little bit of the same inyun since it is a praise for a nes.

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Is your last sentence based on R Kamentsky? I don't see it in Rivevos Ephraim. – Double AA Feb 26 '13 at 0:44
Yes in his footnotes – sam Feb 26 '13 at 0:45

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