Whilst Pop is right on the original function of a choil there is more to it than that for me at least. Momaw makes a good point that it aids precision which is true for me but it also assists in using the balance of the knife for better flexibility. If you want a small mid range knife to work well it is usual to balance them just on the trigger finger of the grip.
It gives a neutral blade weight distribution which is good for control when cutting and gives a modicum of help if you revert a grip to the rear of the handle for light chopping.
But if you want to skin a deer or several deer or work inside the chest cavity to field dress the ability to choke up on the blade...go past the balance point and use it like a "see-saw" fulcrum for short easy cuts getting more precision with the belly curve of the blade...certainly for skinning...it helps. The knife is no longer neutral...has become if anything slightly handle heavy...and the blade feels light and precise in your hand.
So for me I thought the finger choil was a deliberate design feature to address the balance point of the knife and make the most of different holds for different types of work.
My two most used smaller knives are my Ratmandu and my Woodlore Bushcrafter...the later takes the blade right to the grip edge and this helps with deep cuts on wood...which is what the knife is designed for...but having a spear point it does not have much belly curve for skinning...and does not work as easy as a Ratmandu in this task. Working inside a Deer's chest for field dressing...there is no real difference for me on balance but the ability to choke a grip on the RMD gives a little more assistance in shrouding the edge so you only cut what you want and don't "knick" any intestine.The balance point on the Woodlore is right on the trigger finger inside the grip...so it works very light in the hand...like a RMD which has the exact same balance spot...and both are excellent "user" knives. I guess for whittling away at making a Canoe paddle I would prefer the Woodlore...precise cuts can be done with the assistance of a comfy handle...for dressing game...the RMD...but I reckon I could still make as good a paddle with a RMD...because you would only be choking up on the blade for a very few cuts...most could be done from the handle.
Here are some pic's to check out the edge differences...
![[Linked Image from i343.photobucket.com]](http://i343.photobucket.com/albums/o445/SteelFan-Infi/100_0298-1.jpg)
![[Linked Image from i343.photobucket.com]](http://i343.photobucket.com/albums/o445/SteelFan-Infi/100_0023-1.jpg)
![[Linked Image from i343.photobucket.com]](http://i343.photobucket.com/albums/o445/SteelFan-Infi/100_0328-1.jpg)