[MEHDI]

من البته با جرزنی اینرا حل کردم پس جواب را نمی‌گویم، نرم‌افزار قوی از همه‌یِ این‌ها درست‌تر می‌گوید !!

So who was right – or were all four wrong? We urge you to study the above position and draw your own independent conclusion. If you can solve the puzzle in your head you should give yourself a contortionist's pat on the back.
if you cheat, give yourself a punch in the groin.