Simple questions about Nullmove

[Joost Buijs]

Thank you for alle your clarifying answers, which helped me a lot!

Now I implemented the Nullmove, but somehow I expected a greater speed improvement. At depth 5 there is no speed improvement at all, at depth 6 the speed improvement is ca. 35%. Does the nullmove need a certain depth to kick in?

Nullmove is not about speed improvement, it only prunes some parts of the three that are likely score >= beta. Maybe you mean improvement in time to depth instead of speed?