Moderators: hgm, Rebel, chrisw
I think there are many elements:outAtime wrote:Is there any particular eval element which helps strong engines to find 19... Ng6 here?
Code: Select all
for (n = 0; n < 8; n++)
if (board[squaren + n_ofs[n]] == npiece)
g++;
if (board[squaren + n_ofs[n]] == bbishop)
g++;
if (board[squaren + n_ofs[n]] == bknight)
g++;
if (board[squaren + n_ofs[n]] == bqueen)
g++;
Code: Select all
int bishop_mobility_black(int sq, int offsets[])
{
int q, *c = offsets, t = 0;
do {
for (q = sq + *c; board[q] == npiece; q += *c)
t++;
} while (*++c);
if (board[q] && ((board[q] & 1) == 0))
t++;
return t;
}
Well, I have no idea why it does it, but Jazz does switch to Ng6 at 11 ply and seems to stick with it. Note that it seems to badly misevaluate the position (based on the evaluation by stronger engines posted earlier), or at least not like it very much for black, with a score around -0.5.outAtime wrote:I find it difficult to see what would cause this switch since the knight appears well posted on the central square, PST etc would make it difficult to move Ng6. Any ideas? How do these engines decide to switch from Bd7 to Ng6?
Code: Select all
int bishop_mobility_black(int sq, int offsets[])
{
int q, *c = offsets, t = 0;
do {
for (q = sq + *c; board[q] == npiece; q += *c)
t++;
} while (*++c);
if (board[q] && ((board[q] & 1) == 0))
t++;
if (board[q] && (board[q] == wknight))
t++;
t++;
t++;
t++;
t++;
return t;
}