a doubt of grub ..about stage1 stage1.5 stage2

Hello, all.
   I do this test:
   =================================
   1:
   A new PC never run grub-install before .
   rm /boot/grub/*stage*
   reboot

   Is OK. Grub can run and can load kernel.


================================

   2
   grub-install /dev/sda
   rm /boot/grub/*stage*
   reboot

   you can see : grub can not load stage2.

========================
I know that : grub load kernel by this way :
        stage1
       /           \
 stage2       stage1.5
                    \
                 stage2

But I don't know : how grub chose one ?

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