- incorrect hashtable size for that time of play
- weak cpu
- too hot cpu (yes, it can occur)
- few threads used (in short times especially)
When testing books, always add the time increase per any move (i.e. 3+2) and set the hashtable size so that it's average use it's around 40% (you can watch it in the engine output window).
Eduard wrote: ↑06/09/2021, 14:25 I have improved some variants in the Predator book (but I'm still waiting for the update because I want to import more games). However, it is not always easy. The engines also make gross mistakes, especially in blitz. It's not always the books. The mistakes I saw were made by the engines, and most of all, gross mistakes.