user26493: I just downloaded the latest free version of Komodo 12 to try to disable the Null Move Pruning option. So, in my mind, I supposed that for depth 2, it will need 20*20= 400 nodes However I arrived at depth 3 with nodes 78 and depth 4 with 193.
What is the role of the Null Move Pruning option? I thought that it would search every single position even if the moves were disastrous.

user9684: The theory is that if your opponent could make two consecutive moves and not improve his position, you must have an overwhelming advantage.  If you advantage is so great, there's no need to examine other lines, and the search can end.

26493: <p>I just downloaded the latest free version of Komodo 12 to try to disable the Null Move Pruning option. So, in my mind, I supposed that for depth 2, it will need 20*20= 400 nodes However I arrived at depth 3 with nodes 78 and depth 4 with 193.</p>
<p>What is the role of the Null Move Pruning option? I thought that it would search every single position even if the moves were disastrous.</p>
 9684: <p>The theory is that if your opponent could make two consecutive moves and not improve his position, you must have an overwhelming advantage.  If you advantage is so great, there's no need to examine other lines, and the search can end.</p>
