The WinMekMak conjugation tool gives two possible translations of the present conditional.  Examples:

Gitsem/Gidersem  (both translated as ´if I go´ )

Gelsem/Gelirsem (both translated as ´if I come´ )

Is there any difference as to how you would use them?

This has confused me for a while!

To Go=

If it rains I won´t go to the football match : Eðer yaðmur yaðarsa, futbol maçýna gitmem.

To come =

If she doesn´t want to come with me, I go to the movie : Eðer benimle gelmek istemezse, sinemaya giderim. 

 Thanks Yilgun - but that is explaining the negative not the use of gitsem v gidersem

As a native, even I got confused when I read now I can say that there is not much difference. I think we use them interchangably, but in some cases one is better than other. And we use the "gidersem" version more than "gitsem" version in the daily language. I thought of some examples:

I think, "gitsem" version is for more general things. I mean general with respect to time also. Like

"Gitsem, gelir misin?" "Would you come if I go?". Here, it sounds to me like a general question. Actually there is not such a plan of going soon, but just he wants to know the answer in case he plans such a thing one day.

"Gidersem, gelir misin?" "Will you come if I go?" Here, there is a probable plan.

I don´t know if I was able to explain. Actually I have never thought in  my life about such a difference since you use the right one intrinsically in your native language

Thank you very much - it is difficult to explain your own language to others isn´t it?  So really it amounts that I can use either without being wrong!

Hi LIR, my understanding from Turkish classes I have taken is: 

gelsem = if I were to come (where this is the first time you are thinking of coming, not a regular occurance)

gelirsem =  if I come (Aorist tense) where you have come before, but are not sure if you are coming this time.

I have included a link to more "if" variations from the Manisa archive web-site.

http://web.archive.org/web/20071224054252/www.turkishlanguage.co.uk/conditional.htm

Hope this helps.

 Thank you too Henry

1- GÝDERSEM : If I go to visit her, she will be very happy and we´ll have Turkish coffee = Eðer onu ziyarete GÝDER_SEM (GÝDER ÝSEM) , çok mutlu olacak ve Türk kahvesi içeceðz.

2- GELÝRSE (like GELÝRSEM) If she come to visit me, I´ll be very happy and we´ll have Turkish coffee = Eðer o beni ziyarete GELÝR_SE (GELÝR ÝSE) , çok mutlu olacaðým ve Türk kahvesi içeceðiz.

she is not trying to understand the difference between gelmek and gitmek. she is trying to understand the difference between gitsem-gidersem, or gelsem-gelirsem, or yapsam-yaparsam, etc...

These are hard to explain.

Let me try! Sorry if I don´t manage it!!!

Gel-sem, yap-sam, git-sem  are more the "wondering" type of "if".

If I were to do this, I wonder, would you do that.

Gelsem beni sever misin? If I come will you love me?

Often it seems natural to add "acaba" to the end of a sentence like this.

But

Gel-ir-sem, yap-ar-sam, gid-er-sem are more concrete.

If I do this (and I probably will) will you do that.

Gelirsem beni karþýlar mýsýn? If I come will you meet me?