That's an example of splitting the pattern on the inside curve, which on a pistol isn't an issue because of the trigger guard. Where one runs into problems is across the back curve of the grip of a pistol. Unless you start your base lines crossing across the back of the grip, you will run into problems creating the wrap-around pattern. When I chequered Ron's pistol, I started across the back, and ended up fine on the sides of the grip. My Hawken pistol has a strip of bare wood down the centre of the back of the grip so that the chequering isn't continuous. It is much easier to cut two smaller panels that to try for the complete wrap-around. For flat topped chequering, I use a 60 degree cutter, and leave the tops flat.