When forcing entry through a locked wood checkrail/double-hung window, the pry should be made at the:

Forcing entry through a locked wood checkrail or double-hung window requires understanding the mechanics of how the window operates. The correct point to apply the pry is at the top of the lower sash. This area is more vulnerable because it allows you to leverage the mechanics of the window's locking mechanism effectively.

When the pry is applied at the top of the lower sash, it can create a gap that allows for the unlocking of the checkrail, either by pushing up the sash or using additional tools to disengage the locking mechanism. This method also minimizes potential damage to the window frame and surrounding areas.

Applying the pry at the bottom of the upper sash, the side of the window frame, or the center of the double-hung window may not provide the same mechanical advantage and can cause more significant damage or simply be less effective in gaining access. Thus, the top of the lower sash is strategically the best choice for efficient and safe forced entry.