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brchess/src/eval-values.c

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/* eval-simple.c - simple position evaluation.
*
* Copyright (C) 2023 Bruno Raoult ("br")
* Licensed under the GNU General Public License v3.0 or later.
* Some rights reserved. See COPYING.
*
* You should have received a copy of the GNU General Public License along with this
* program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
*
* SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
*
*/
#include <brlib.h>
#include <bitops.h>
#include "chessdefs.h"
#include "piece.h"
#include "position.h"
#include "eval-simple.h"
#include "eval.h"
/*
* Piece-square tables. For easier reading, they are defined for black side:
*
* {
* A8 .... H8
* ..........
* ..........
* A1 .... H1
* }
*/
const struct pc_sq pc_sq_def[] = {
{
/*
* rofchade:
* https://www.talkchess.com/forum3/viewtopic.php?f=2&t=68311&start=19
*/
"rofchade",
{
[PAWN] = {
{ /* midgame */
0, 0, 0, 0, 0, 0, 0, 0,
98, 134, 61, 95, 68, 126, 34, -11,
-6, 7, 26, 31, 65, 56, 25, -20,
-14, 13, 6, 21, 23, 12, 17, -23,
-27, -2, -5, 12, 17, 6, 10, -25,
-26, -4, -4, -10, 3, 3, 33, -12,
-35, -1, -20, -23, -15, 24, 38, -22,
0, 0, 0, 0, 0, 0, 0, 0,
},
{ /* endgame */
0, 0, 0, 0, 0, 0, 0, 0,
178, 173, 158, 134, 147, 132, 165, 187,
94, 100, 85, 67, 56, 53, 82, 84,
32, 24, 13, 5, -2, 4, 17, 17,
13, 9, -3, -7, -7, -8, 3, -1,
4, 7, -6, 1, 0, -5, -1, -8,
13, 8, 8, 10, 13, 0, 2, -7,
0, 0, 0, 0, 0, 0, 0, 0,
}
},
[KNIGHT] = {
{ /* midgame */
-167, -89, -34, -49, 61, -97, -15, -107,
-73, -41, 72, 36, 23, 62, 7, -17,
-47, 60, 37, 65, 84, 129, 73, 44,
-9, 17, 19, 53, 37, 69, 18, 22,
-13, 4, 16, 13, 28, 19, 21, -8,
-23, -9, 12, 10, 19, 17, 25, -16,
-29, -53, -12, -3, -1, 18, -14, -19,
-105, -21, -58, -33, -17, -28, -19, -23,
},
{ /* endgame */
-58, -38, -13, -28, -31, -27, -63, -99,
-25, -8, -25, -2, -9, -25, -24, -52,
-24, -20, 10, 9, -1, -9, -19, -41,
-17, 3, 22, 22, 22, 11, 8, -18,
-18, -6, 16, 25, 16, 17, 4, -18,
-23, -3, -1, 15, 10, -3, -20, -22,
-42, -20, -10, -5, -2, -20, -23, -44,
-29, -51, -23, -15, -22, -18, -50, -64,
}
},
[BISHOP] = {
{ /* midgame */
-29, 4, -82, -37, -25, -42, 7, -8,
-26, 16, -18, -13, 30, 59, 18, -47,
-16, 37, 43, 40, 35, 50, 37, -2,
-4, 5, 19, 50, 37, 37, 7, -2,
-6, 13, 13, 26, 34, 12, 10, 4,
0, 15, 15, 15, 14, 27, 18, 10,
4, 15, 16, 0, 7, 21, 33, 1,
-33, -3, -14, -21, -13, -12, -39, -21,
},
{ /* endgame */
-14, -21, -11, -8, -7, -9, -17, -24,
-8, -4, 7, -12, -3, -13, -4, -14,
2, -8, 0, -1, -2, 6, 0, 4,
-3, 9, 12, 9, 14, 10, 3, 2,
-6, 3, 13, 19, 7, 10, -3, -9,
-12, -3, 8, 10, 13, 3, -7, -15,
-14, -18, -7, -1, 4, -9, -15, -27,
-23, -9, -23, -5, -9, -16, -5, -17,
},
},
[ROOK] = {
{ /* midgame */
32, 42, 32, 51, 63, 9, 31, 43,
27, 32, 58, 62, 80, 67, 26, 44,
-5, 19, 26, 36, 17, 45, 61, 16,
-24, -11, 7, 26, 24, 35, -8, -20,
-36, -26, -12, -1, 9, -7, 6, -23,
-45, -25, -16, -17, 3, 0, -5, -33,
-44, -16, -20, -9, -1, 11, -6, -71,
-19, -13, 1, 17, 16, 7, -37, -26,
},
{ /* endgame */
13, 10, 18, 15, 12, 12, 8, 5,
11, 13, 13, 11, -3, 3, 8, 3,
7, 7, 7, 5, 4, -3, -5, -3,
4, 3, 13, 1, 2, 1, -1, 2,
3, 5, 8, 4, -5, -6, -8, -11,
-4, 0, -5, -1, -7, -12, -8, -16,
-6, -6, 0, 2, -9, -9, -11, -3,
-9, 2, 3, -1, -5, -13, 4, -20,
},
},
[QUEEN] = {
{ /* midgame */
-28, 0, 29, 12, 59, 44, 43, 45,
-24, -39, -5, 1, -16, 57, 28, 54,
-13, -17, 7, 8, 29, 56, 47, 57,
-27, -27, -16, -16, -1, 17, -2, 1,
-9, -26, -9, -10, -2, -4, 3, -3,
-14, 2, -11, -2, -5, 2, 14, 5,
-35, -8, 11, 2, 8, 15, -3, 1,
-1, -18, -9, 10, -15, -25, -31, -50,
},
{ /* endgame */
-9, 22, 22, 27, 27, 19, 10, 20,
-17, 20, 32, 41, 58, 25, 30, 0,
-20, 6, 9, 49, 47, 35, 19, 9,
3, 22, 24, 45, 57, 40, 57, 36,
-18, 28, 19, 47, 31, 34, 39, 23,
-16, -27, 15, 6, 9, 17, 10, 5,
-22, -23, -30, -16, -16, -23, -36, -32,
-33, -28, -22, -43, -5, -32, -20, -41,
},
},
[KING] = { /* midgame */
{
-65, 23, 16, -15, -56, -34, 2, 13,
29, -1, -20, -7, -8, -4, -38, -29,
-9, 24, 2, -16, -20, 6, 22, -22,
-17, -20, -12, -27, -30, -25, -14, -36,
-49, -1, -27, -39, -46, -44, -33, -51,
-14, -14, -22, -46, -44, -30, -15, -27,
1, 7, -8, -64, -43, -16, 9, 8,
-15, 36, 12, -54, 8, -28, 24, 14,
},
{ /* endgame */
-74, -35, -18, -18, -11, 15, 4, -17,
-12, 17, 14, 17, 17, 38, 23, 11,
10, 17, 23, 15, 20, 45, 44, 13,
-8, 22, 24, 27, 26, 33, 26, 3,
-18, -4, 21, 24, 27, 23, 9, -11,
-19, -3, 11, 21, 23, 16, 7, -9,
-27, -11, 4, 13, 14, 4, -5, -17,
-53, -34, -21, -11, -28, -14, -24, -43
}
}
}
}, /* CPW */
{
/*
* CPW:
* https://www.chessprogramming.org/Simplified_Evaluation_Function
* Note: ≠ https://github.com/nescitus/cpw-engine
*/
"cpw",
{
[PAWN] = {
{ /* midgame */
0, 0, 0, 0, 0, 0, 0, 0,
50, 50, 50, 50, 50, 50, 50, 50,
10, 10, 20, 30, 30, 20, 10, 10,
5, 5, 10, 25, 25, 10, 5, 5,
0, 0, 0, 20, 20, 0, 0, 0,
5, -5, -10, 0, 0, -10, -5, 5,
5, 10, 10, -20, -20, 10, 10, 5,
0, 0, 0, 0, 0, 0, 0, 0,
},
{ /* endgame */
0, 0, 0, 0, 0, 0, 0, 0,
50, 50, 50, 50, 50, 50, 50, 50,
10, 10, 20, 30, 30, 20, 10, 10,
5, 5, 10, 25, 25, 10, 5, 5,
0, 0, 0, 20, 20, 0, 0, 0,
5, -5, -10, 0, 0, -10, -5, 5,
5, 10, 10, -20, -20, 10, 10, 5,
0, 0, 0, 0, 0, 0, 0, 0,
},
},
[KNIGHT] = {
{ /* midgame */
-50, -40, -30, -30, -30, -30, -40, -50,
-40, -20, 0, 0, 0, 0, -20, -40,
-30, 0, 10, 15, 15, 10, 0, -30,
-30, 5, 15, 20, 20, 15, 5, -30,
-30, 0, 15, 20, 20, 15, 0, -30,
-30, 5, 10, 15, 15, 10, 5, -30,
-40, -20, 0, 5, 5, 0, -20, -40,
-50, -40, -30, -30, -30, -30, -40, -50
},
{ /* endgame */
-50, -40, -30, -30, -30, -30, -40, -50,
-40, -20, 0, 0, 0, 0, -20, -40,
-30, 0, 10, 15, 15, 10, 0, -30,
-30, 5, 15, 20, 20, 15, 5, -30,
-30, 0, 15, 20, 20, 15, 0, -30,
-30, 5, 10, 15, 15, 10, 5, -30,
-40, -20, 0, 5, 5, 0, -20, -40,
-50, -40, -30, -30, -30, -30, -40, -50
},
},
[BISHOP] = {
{ /* midgame */
-20, -10, -10, -10, -10, -10, -10, -20,
-10, 0, 0, 0, 0, 0, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 5, 5, 10, 10, 5, 5, -10,
-10, 0, 10, 10, 10, 10, 0, -10,
-10, 10, 10, 10, 10, 10, 10, -10,
-10, 5, 0, 0, 0, 0, 5, -10,
-20, -10, -10, -10, -10, -10, -10, -20,
},
{ /* endgame */
-20, -10, -10, -10, -10, -10, -10, -20,
-10, 0, 0, 0, 0, 0, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 5, 5, 10, 10, 5, 5, -10,
-10, 0, 10, 10, 10, 10, 0, -10,
-10, 10, 10, 10, 10, 10, 10, -10,
-10, 5, 0, 0, 0, 0, 5, -10,
-20, -10, -10, -10, -10, -10, -10, -20,
},
},
[ROOK] = {
{ /* midgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 10, 10, 10, 10, 10, 5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
0, 0, 0, 5, 5, 0, 0, 0,
},
{ /* endgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 10, 10, 10, 10, 10, 5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
0, 0, 0, 5, 5, 0, 0, 0,
},
},
[QUEEN] = {
{ /* midgame */
-20, -10, -10, -5, -5, -10, -10, -20,
-10, 0, 0, 0, 0, 0, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-5, 0, 5, 5, 5, 5, 0, -5,
0, 0, 5, 5, 5, 5, 0, -5,
-10, 5, 5, 5, 5, 5, 0, -10,
-10, 0, 5, 0, 0, 0, 0, -10,
-20, -10, -10, -5, -5, -10, -10, -20,
},
{ /* endgame */
-20, -10, -10, -5, -5, -10, -10, -20,
-10, 0, 0, 0, 0, 0, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-5, 0, 5, 5, 5, 5, 0, -5,
0, 0, 5, 5, 5, 5, 0, -5,
-10, 5, 5, 5, 5, 5, 0, -10,
-10, 0, 5, 0, 0, 0, 0, -10,
-20, -10, -10, -5, -5, -10, -10, -20,
},
},
[KING] = { /* midgame */
{
-30, -40, -40, -50, -50, -40, -40, -30,
-30, -40, -40, -50, -50, -40, -40, -30,
-30, -40, -40, -50, -50, -40, -40, -30,
-30, -40, -40, -50, -50, -40, -40, -30,
-20, -30, -30, -40, -40, -30, -30, -20,
-10, -20, -20, -20, -20, -20, -20, -10,
20, 20, 0, 0, 0, 0, 20, 20,
20, 30, 10, 0, 0, 10, 30, 20,
},
{ /* endgame */
-50, -40, -30, -20, -20, -30, -40, -50,
-30, -20, -10, 0, 0, -10, -20, -30,
-30, -10, 20, 30, 30, 20, -10, -30,
-30, -10, 30, 40, 40, 30, -10, -30,
-30, -10, 30, 40, 40, 30, -10, -30,
-30, -10, 20, 30, 30, 20, -10, -30,
-30, -30, 0, 0, 0, 0, -30, -30,
-50, -30, -30, -30, -30, -30, -30, -50,
}
}
}
}, /* CPW */
{
/*
* sjeng: https://github.com/gcp/sjeng
* Rook and Queen from CPW.
*/
"sjeng",
{
[PAWN] = {
{ /* midgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 15, 20, 20, 15, 10, 5,
4, 8, 12, 16, 16, 12, 8, 4,
3, 6, 9, 14, 14, 9, 6, 3,
2, 4, 6, 12, 12, 6, 4, 2,
1, 2, 3, 10, 10, 3, 2, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
},
{ /* endgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 15, 20, 20, 15, 10, 5,
4, 8, 12, 16, 16, 12, 8, 4,
3, 6, 9, 14, 14, 9, 6, 3,
2, 4, 6, 12, 12, 6, 4, 2,
1, 2, 3, 10, 10, 3, 2, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
},
},
[KNIGHT] = {
{ /* midgame */
-20, -10, -10, -10, -10, -10, -10, -20,
-10, 0, 0, 3, 3, 0, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 0, 3, 3, 0, 0, -10,
-20, -10, -10, -10, -10, -10, -10, -20,
},
{ /* endgame */
-20, -10, -10, -10, -10, -10, -10, -20,
-10, 0, 0, 3, 3, 0, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 0, 5, 10, 10, 5, 0, -10,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 0, 3, 3, 0, 0, -10,
-20, -10, -10, -10, -10, -10, -10, -20,
},
},
[BISHOP] = {
{ /* midgame */
-2, -2, -2, -2, -2, -2, -2, -2,
-2, 8, 5, 5, 5, 5, 8, -2,
-2, 3, 3, 5, 5, 3, 3, -2,
-2, 2, 5, 4, 4, 5, 2, -2,
-2, 2, 5, 4, 4, 5, 2, -2,
-2, 3, 3, 5, 5, 3, 3, -2,
-2, 8, 5, 5, 5, 5, 8, -2,
-2, -2, -2, -2, -2, -2, -2, -2,
},
{ /* endgame */
-2, -2, -2, -2, -2, -2, -2, -2,
-2, 8, 5, 5, 5, 5, 8, -2,
-2, 3, 3, 5, 5, 3, 3, -2,
-2, 2, 5, 4, 4, 5, 2, -2,
-2, 2, 5, 4, 4, 5, 2, -2,
-2, 3, 3, 5, 5, 3, 3, -2,
-2, 8, 5, 5, 5, 5, 8, -2,
-2, -2, -2, -2, -2, -2, -2, -2,
},
},
[ROOK] = {
{ /* midgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 10, 10, 10, 10, 10, 5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
0, 0, 0, 5, 5, 0, 0, 0,
},
{ /* endgame */
0, 0, 0, 0, 0, 0, 0, 0,
5, 10, 10, 10, 10, 10, 10, 5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
-5, 0, 0, 0, 0, 0, 0, -5,
0, 0, 0, 5, 5, 0, 0, 0,
},
},
[QUEEN] = {
{ /* midgame */
-20, -10, -10, -5, -5, -10, -10, -20,
-10, 0, 5, 0, 0, 0, 0, -10,
-10, 5, 5, 5, 5, 5, 0, -10,
0, 0, 5, 5, 5, 5, 0, -5,
-5, 0, 5, 5, 5, 5, 0, -5,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 0, 0, 0, 0, 0, -10,
-20, -10, -10, -5, -5, -10, -10, -20,
},
{ /* endgame */
-20, -10, -10, -5, -5, -10, -10, -20,
-10, 0, 5, 0, 0, 0, 0, -10,
-10, 5, 5, 5, 5, 5, 0, -10,
0, 0, 5, 5, 5, 5, 0, -5,
-5, 0, 5, 5, 5, 5, 0, -5,
-10, 0, 5, 5, 5, 5, 0, -10,
-10, 0, 0, 0, 0, 0, 0, -10,
-20, -10, -10, -5, -5, -10, -10, -20,
},
},
[KING] = { /* midgame */
{
-55, -55, -89, -89, -89, -89, -55, -55,
-34, -34, -55, -55, -55, -55, -34, -34,
-21, -21, -34, -34, -34, -34, -21, -21,
-13, -13, -21, -21, -21, -21, -13, -13,
-8, -8, -13, -13, -13, -13, -8, -8,
-5, -5, -8, -8, -8, -8, -5, -5,
-3, -5, -6, -6, -6, -6, -5, -3,
2, 14, 0, 0, 0, 9, 14, 2,
},
{ /* endgame */
-5, -3, -1, 0, 0, -1, -3, -5,
-3, 10, 10, 10, 10, 10, 10, -3,
-1, 10, 25, 25, 25, 25, 10, -1,
0, 10, 25, 30, 30, 25, 10, 0,
0, 10, 25, 30, 30, 25, 10, 0,
-1, 10, 25, 25, 25, 25, 10, -1,
-3, 10, 10, 10, 10, 10, 10, -3,
-5, -3, -1, 0, 0, -1, -3, -5,
}
}
},
}, /* sjeng */
};
const int nb_pc_sq = ARRAY_SIZE(pc_sq_def); /* # of predefined pc_sq tables */
int pc_sq_current = 0;
int pc_sq_mg[COLOR_NB][PT_NB][SQUARE_NB];
int pc_sq_eg[COLOR_NB][PT_NB][SQUARE_NB];
/* phase calculation from Fruit:
* https://github.com/Warpten/Fruit-2.1
*/
/**
* calc_phase - calculate position phase
* @pos: &position
*
* This function should be calculated when a new position is setup, or as
* a verification of an incremental one.
* phase is clamped between 0 (opening) and 24 (ending).
*
* @return:
*/
s16 calc_phase(pos_t *pos)
{
int phase = ALL_PHASE;
phase -= P_PHASE * popcount64(pos->bb[WHITE][PAWN] | pos->bb[BLACK][PAWN]);
phase -= N_PHASE * popcount64(pos->bb[WHITE][KNIGHT] | pos->bb[BLACK][KNIGHT]);
phase -= B_PHASE * popcount64(pos->bb[WHITE][BISHOP] | pos->bb[BLACK][BISHOP]);
phase -= R_PHASE * popcount64(pos->bb[WHITE][ROOK] | pos->bb[BLACK][ROOK]);
phase -= Q_PHASE * popcount64(pos->bb[WHITE][QUEEN] | pos->bb[BLACK][QUEEN]);
phase = clamp(phase, 0, ALL_PHASE);
# ifdef DEBUG_EVAL
printf("calc phase:%d\n", phase);
# endif
return phase;
}
int eval_simple_find(char *str)
{
for (int i = 0; i < nb_pc_sq; ++i)
if (!strcmp(pc_sq_def[i].name, str))
return i;
return -1;
}
void eval_simple_set(int set)
{
const struct pc_sq *cur = pc_sq_def + set;
# ifdef DEBUG_EVAL
printf("initializing piece-square tables %d\n", set);
# endif
pc_sq_current = set;
for (piece_type_t pt = PAWN; pt < PT_NB; ++pt) {
for (square_t sq = 0; sq < SQUARE_NB; ++sq) {
pc_sq_mg[BLACK][pt][sq] = cur->val[MIDGAME][pt][sq];
pc_sq_mg[WHITE][pt][sq] = cur->val[MIDGAME][pt][FLIP_V(sq)];
pc_sq_eg[BLACK][pt][sq] = cur->val[ENDGAME][pt][sq];
pc_sq_eg[WHITE][pt][sq] = cur->val[ENDGAME][pt][FLIP_V(sq)];
}
}
}
void eval_simple_init(char *set)
{
int n = eval_simple_find(set);
# ifdef DEBUG_EVAL
printf("initializing eval_simple with set=%s: found=%d\n", set, n);
# endif
if (n >= 0)
pc_sq_current = n;
eval_simple_set(pc_sq_current);
}
/**
* eval_material() - eval position material
* @pos: &position to evaluate
*
* Basic material evaluation. Only midgame value is used.
*
* @return: the @pos material evaluation in centipawns
*/
eval_t eval_material(pos_t *pos)
{
eval_t val[COLOR_NB] = { 0 };
for (piece_type_t pt = PAWN; pt < KING; ++pt) {
eval_t pval = piece_midval(pt);
val[WHITE] += popcount64(pos->bb[WHITE][pt]) * pval;
val[BLACK] += popcount64(pos->bb[BLACK][pt]) * pval;
}
# ifdef DEBUG_EVAL
printf("material: w:%d b:%d\n", val[WHITE], val[BLACK]);
# endif
return val[WHITE] - val[BLACK];
}
/**
* eval_simple() - simple and fast position evaluation
* @pos: &position to evaluate
*
* This function is normally used only during initialization,
* or when changing phase (middlegame <--> endgame), as the eval
* will be done incrementally when doing moves.
*
* @return: the @pos evaluation in centipawns
*/
eval_t eval_simple(pos_t *pos)
{
eval_t eval[2] = { 0, 0 };
eval_t mg_eval[2], eg_eval[2];
//struct pc_sq = sq_ int (*gg)[6 + 2][64] = eg? pc_sq_eg: pc_sq_mg;
//pos->eval_simple_phase = ENDGAME;
for (color_t color = WHITE; color < COLOR_NB; ++color) {
mg_eval[color] = 0;
eg_eval[color] = 0;
for (piece_type_t pt = PAWN; pt < KING; pt++) {
bitboard_t bb = pos->bb[color][pt];
while (bb) {
square_t sq = bb_next(&bb);
mg_eval[color] += pc_sq_mg[color][pt][sq];
eg_eval[color] += pc_sq_eg[color][pt][sq];
}
# ifdef DEBUG_EVAL
printf("c=%d pt=%d mg=%d eg=%d\n", color, pt,
mg_eval[color], eg_eval[color]);
# endif
}
}
# ifdef DEBUG_EVAL
printf("phase:%d mg[WHITE]:%d mg[BLACK]:%d eg[WHITE]:%d eg[BLACK]:%d\n",
pos->phase, mg_eval[WHITE], mg_eval[BLACK], eg_eval[WHITE], eg_eval[BLACK]);
# endif
return eval[WHITE] - eval[BLACK];
}
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