Look the position Fevga (Jaak vs. AlterMann) , please!
All black checkers are blocked, but they are not collected onto the one point behind player's prime. Thus BrainKing Fevga rules http://brainking.com/en/GameRules?tp=111 don´t require to unblock a point in the prime to allow the opponent a chance to move. I used this possibility and moved
41. 18-23, 18-23, 17-22, 19-24
Backgammon Galore has the same rules http://www.bkgm.com/variants/Fevga.html but there is a reference of George Savdar http://www.bkgm.com/rgb/rgb.cgi?view+1202 that there are many different variations in Greece.
The main variation has a rule:
If you have a 6-prime and the opponent can't move at any dice (for example has all his checkers behind this prime (not the only case), you MUST free one point in your turn in order the opponent to have non-zero probability to move.
So, according to this rule I did an illegale move. Where is the truth?