Captcha at the entrance to the site

For a couple of days I had to log in several times from different computers, and how it was supposed to introduce a captcha.
What was my surprise that my neural network (read the brain) gives the results a little better than the algorithms described in Habré ( 1 , 2 ).
It is very difficult to distinguish the following pairs:

1. 1 - I
2. 8 - B
3. 5 - S
4. 6 - G

This is an incomplete list, sometimes the characters are so distorted that the number of options becomes unacceptable. Moreover, it is not known for certain that all characters are displayed in upper case, hence more doubts. Opera Mini is a separate story altogether, with the resolution of 320x240 and the maximum quality of the downloaded images, the captcha had to be updated several times.
UFO, take pity ...

PS: My sight is 100%. At first glance, a captcha seems simple, but alas, when entering a seemingly obvious option, it is often a glorious mistake.