Make gates block bolts more frequently

[stephen]

In the original Amiga Knights, closed gates originally blocked bolts 50% of the time, but this was apparently changed to 25% in a later version.

My version of Knights uses 25% but I think this should be changed back to 50%. The reason is that the change to 25% had the (presumably unintended) consequence of making a particular gnome book almost impossible. (See attached screenshot.)

Here you are supposed to close the two gates on the right, then walk up to the switch in the middle of the room. Unfortunately, if the closed gates only block 25% of bolts, then it is virtually impossible to do this without getting shot. Making closed gates block 50% of bolts would solve this.

This was reported by Claudio Cipolla.