Need help on pic connect 4

[Heckler]

This line in your code ...

if (b.0[rows]=0)then fall=0 : goto main

is the same as...

if (b.0[rows]=0)then fall=0 
goto main

you probably need this...

if (b.0[rows]=0)then 
  fall=0 
  goto main
endif

That way the "goto main" will only be executed if the preceding IF statement is true

from the PBP manual...

4.13. Multi-statement Lines

In order to allow more compact programs and logical grouping of related commands, PBP supports the use of the colon

":" to separate statements placed on the same line. Thus, the following two examples are equivalent:

W2 = W0
W0 = W1
W1 = W2

is the same as:

W2 = W0 : W0 = W1 : W1 = W2

This does not, however, change the size of the generated code.