I don't have my ICPI book handy right now (although I'm not sure this is in there either) but I'm wondering, when you lay a soldier/sailor course around a curve, how much extra gap is acceptable? Right now I'm laying a large walkway where most of the border is running in a curve, mostly pretty tight. Most of the outside gaps are around 1/2" with a few to 3/4". Anything over that and I've been cutting random pieces to bring the gaps back in line (obviously the 1/2" and 3/4" gaps coincide with the tightness of the different curves and not random through the walk). From my eye, the gaps look fine, but what about the integrity of the interlock??