Thanks for these replies - I must become more familiar with memory caching vs processing speeds- that said, I am not close to finalising my board state reqirements: to include incremental evaluation criteria, facilitate further optimisation of move generation code etc - so don't know how big its ...

Apologies if this is a little basic for this forum: I am fairy new to this and am trying to get my head around why most chess engines unmake moves, rather than using memory copy during the search. I understand (vagely) that it is broadly to do with memory access latencies, but with more modern ...