1300 lines of code for this is ludicrous.
You have gotos all over the place. They are hard to read and hard to debug.
You have
1 2 3 4 5 6 7 8
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(i==0 && (j==0 || j==2 || j==4 || j==6)) ||
(i==1 && (j==1 || j==3 || j==5 || j==7)) ||
(i==2 && (j==0 || j==2 || j==4 || j==6)) ||
(i==3 && (j==1 || j==3 || j==5 || j==7)) ||
(i==4 && (j==0 || j==2 || j==4 || j==6)) ||
(i==5 && (j==1 || j==3 || j==5 || j==7)) ||
(i==6 && (j==0 || j==2 || j==4 || j==6)) ||
(i==7 && (j==1 || j==3 || j==5 || j==7))
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and similar monsters. This code here is equivalent to (i-j)%2 == 0. I haven't read all of your code, so I can't give criticism on it's structure though.
If you are going to use platform specific functions, you could make better use of them. Now you only use Sleep, which serves little purpose. If you looked into console functions windows API gives you, you could make it colourful, comfortably distribute text on the screen and etc.
Though a much better idea would to drop console and use some graphics library like SFML.
User interface is not comfortable. You could have him enter "a1 to b2" or something like that, instead of asking each coordinate separately. Don't force your notation on the user. You can easily convert "a1" to 0,0 yourself.
Sorry if I'm a bit harsh. I understand you just started. I'm sure most of there problems will disappear as you gather more experience.