TalkChess.com

I don't think there's a clear standard for what counts as a node--different engines count differently.

One common, simple approach is "increment the node count whenever you make a move".

I don't think Oracle cares about selling to anyone who isn't spending millions of dollars. Computer chess hobbyists aren't really their target market

I've been quietly working on a rewrite of Daydreamer. If it's ready in time, I'd like to enter it.

I don't think it's really possible to disentangle the effects of improved hardware and improved software, because they have evolved together. For example, modern bitboard move generation is a giant leap forward from 70's techniques, but it couldn't have practically been used on the hardware of the 7...

The error message suggests that the build is actually using an older compiler that doesn't understand c++11. You might need to edit make.sh to explicitly use g++-4.8 or something along those lines.

Weird coincidence, I've been slowly revamping my engine and ran a similar do/undo vs copy experiment last week. My result was similar--about a 5% advantage to explicit undo (with a somewhat smaller board state to copy).

I think you are confusing an unknown/undefined value with undefined behaviour. The latter is a technical term with a specific, well-defined, meaning. Reading a volatile variable isn't UB. Well, it was said somewhere that race conditions are mentioned in the standard as a form of undefined behavior,...

On a side note, you can find a good overview of potential pitfalls in the use of volatile variables here: http://blog.regehr.org/archives/28. Items 5-8 are especially relevant. I think people often overestimate the guarantees that volatile variables provide, and the insides of modern superscalar mul...

The C standard in fact agrees with you: Accessing a volatile object, modifying an object , modifying a file, or calling a function that does any of those operations are all side effects, which are changes in the state of the execution environment. Evaluation of an expression may produce side effect...

Today I came across this interesting app in the Play Store: https://play.google.com/store/apps/details?id=org.chessenginespack It has bundled all UCI engines for Android with NO Chess board or UI and is being sold for $1.29!! "Free updates forever." <-- Classic! :-) Developer's site: http://juanlui...