Regardless of how much you prance around claiming that the "rook behind enemy pawns code is a good idea, it fails miserably. I tested it in TWO different programs, Crafty and Fruit. Both do the USUAL rook on open/half-open file scoring. I made them both use the "rybka idea" and both saw a ...

The bishop pair is a well known chess heuristic. It says "2 bishops is good" and better than "1 bishop" or "0 bishop". Therefore chess programmer, he count bishops and say if count>1 then bonus. Therefore ... FILTER this one OUT Note that filtering anything where the Rybka/Fruit overlap is less ...

... the thing you don't understand. Rybka gives a bonus for getting round the back of the enemy pawn chain. The Rybka bonus is oblivious to the base of the pawn chain, or even if the opponent has any pawns at all. Black pawns on f7, g6, and h5, White pawn on a2, White rook on a3, Black pawns on a6 ...

// mask_open_file_w[square] is a bitmap of squares in front of the square "square" from white's perspective. If square == E2, then
// this contains 1 bits on E3, E4, E5, E6 and E7. Zeros everywhere else. This is wrong, it also has a 1-bit on E8.

In Strelka, the initalisation is:

for (sq = i + 8 ...

I would say your 0.8 for the rook-pawn code is an outrageous mistake. It was 0.7 for "open" files and 0.6 for "semi-open" files. why no FILTERING? There are three directions for filtering, namely reasons of efficiency, extrernal factors, or common use. The first two have much in common for computer ...

Regardless of how much you prance around claiming that the "rook behind enemy pawns code is a good idea, it fails miserably. I tested it in TWO different programs, Crafty and Fruit. Both do the USUAL rook on open/half-open file scoring. I made them both use the "rybka idea" and both saw a ...

Regardless of how much you prance around claiming that the "rook behind enemy pawns code is a good idea, it fails miserably. I tested it in TWO different programs, Crafty and Fruit. Both do the USUAL rook on open/half-open file scoring. I made them both use the "rybka idea" and both saw a ...

Meanwhile every chess player will give a rook a BONUS for being on the open file, ZERO BONUS for being behind its own pawns, and a POSITIVE BONUS for being behind the enemy pawns I'm not sure what you mean here by "behind", is it only on the same file? At least in rook endgames, being behind your ...

I don't know even where to begin what's wrong with EVAL_COMP. Here is minor yet real funny one.

Evaluation bishop pair. Watkins similarity is 0.3
Fruit - classic evaluation
Rybka - no code at all, it's pre calculated in the MIT (material imbalance table)

Meaning, IN THE LIGHT OF THE ACCUSATION ...

And it is something I have repeatedly asked and never got a good answer:
1. What is too much? And where in rule #2 is that described, defined? See Levy's response in the ChessBase "interview". Similarly, the FIDE Anti-Cheating Commission chose not to define "cheating" per se , and in their ...