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misc.c
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misc.c
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/*******************************************************************************
BUCEPHALUS Progressive Chess Analysis Tool
Copyright (C) 2016 Doug Hyatt
Code Author: Doug Hyatt
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "chess.h"
int IsCheck(Position *p, unsigned char side) {
if(side == WHITE && Attacked(p, p->wkingx, p->wkingy, BLACK) == 1) return 1;
if(side == BLACK && Attacked(p, p->bkingx, p->bkingy, WHITE) == 1) return 1;
return 0;
}
int IsMate(Position *p, unsigned char side) {
int x;
unsigned char tempside;
tempside = p->side;
if(IsCheck(p, side) == 0) return 0;
p->side = side;
x = AnyLegalMoves(p);
p->side = tempside;
if(x == 1) return 0;
else {
return 1; }
}
int IsStalemate(Position *p, unsigned char side) {
int x;
unsigned char tempside = p->side;
if(IsCheck(p, side) == 1) return 0;
p->side = side;
x = AnyLegalMoves(p);
p->side = tempside;
if(x == 1) return 0;
else return 1;
}
/* en passant packing/unpacking functions */
int IsEpSquare(short x, short y, unsigned short epstatus)
{
if(y == 5 && ((1 << (x-2)) & epstatus)) return 1;
else if(y == 6 && ((1 << (x+6)) & epstatus)) return 1;
else return 0;
}
unsigned short MakeEpSquare(short x, short y, unsigned short epstatus)
{
if(y == 6 && !(IsEpSquare(x,y,epstatus)))
return epstatus + (1 << (x+6));
else if(y == 5 && !(IsEpSquare(x,y,epstatus)))
return epstatus + (1 << (x-2));
else return epstatus;
}
unsigned short RemoveEpSquare(short x, short y, unsigned short epstatus)
{
if(y == 6 && IsEpSquare(x,y,epstatus))
return epstatus - (1 << (x+6));
else if(y == 5 && IsEpSquare(x,y,epstatus))
return epstatus - (1 << (x-2));
else return epstatus;
}
short Minval(short a, short b) {
if(a < b) return a;
else return b;
}
short Maxval(short a, short b) {
if(a > b) return a;
else return b;
}
int Binary(unsigned char c) {
if(c == 0) return 0;
else return 1; }
int ResolveCollision(Position *p, unsigned long key, int depth, int count)
{
unsigned long i, j, shift;
unsigned long prank[8];
for(i = 0; i < 8; i++) prank[i] = 0;
for(i = 2; i < 10; i++) {
for(j = 2; j < 10; j++) {
shift = (j-2) * 4;
switch(p->board[i][j]) {
case EMPTY :
break;
case WHITE + PAWN :
prank[i-2] += (1uL << shift);
break;
case WHITE + KNIGHT :
prank[i-2] += (1uL << (++shift));
break;
case WHITE + BISHOP :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
case WHITE + ROOK :
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + QUEEN :
prank[i-2] += (1uL << shift);
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + KING :
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + PAWN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + KNIGHT :
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + BISHOP :
prank[i-2] += (1uL << shift);
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + ROOK :
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + QUEEN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + KING :
shift += 2;
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
}
}
}
if(prank[0] == TransTable[key].rank[0])
if(prank[1] == TransTable[key].rank[1])
if(prank[2] == TransTable[key].rank[2])
if(prank[3] == TransTable[key].rank[3])
if(prank[4] == TransTable[key].rank[4])
if(prank[5] == TransTable[key].rank[5])
if(prank[6] == TransTable[key].rank[6])
if(prank[7] == TransTable[key].rank[7])
{
if(depth - count <= TransTable[key].depth - TransTable[key].count) {
return 1; }}
return 0;
}
void AddtoTable(Position *p, int depth, int count, int val)
{
unsigned long key, i, j, shift;
unsigned long prank[8];
key = HashPosition(p);
for(i = 0; i < 8; i++) prank[i] = 0;
for(i = 2; i < 10; i++) {
for(j = 2; j < 10; j++) {
shift = (j-2) * 4;
switch(p->board[i][j]) {
case EMPTY :
break;
case WHITE + PAWN :
prank[i-2] += (1uL << shift);
break;
case WHITE + KNIGHT :
prank[i-2] += (1uL << (++shift));
break;
case WHITE + BISHOP :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
case WHITE + ROOK :
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + QUEEN :
prank[i-2] += (1uL << shift);
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + KING :
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + PAWN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + KNIGHT :
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + BISHOP :
prank[i-2] += (1uL << shift);
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + ROOK :
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + QUEEN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + KING :
shift += 2;
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
}
}
}
if(TransTable[key].depth != -1 && TransTable[key].depth >= depth) {
if(prank[0] == TransTable[key].rank[0])
if(prank[1] == TransTable[key].rank[1])
if(prank[2] == TransTable[key].rank[2])
if(prank[3] == TransTable[key].rank[3])
if(prank[4] == TransTable[key].rank[4])
if(prank[5] == TransTable[key].rank[5])
if(prank[6] == TransTable[key].rank[6])
if(prank[7] == TransTable[key].rank[7])
return;
if(TransTable[key].depth - TransTable[key].count >= depth - count)
return;
}
TransTable[key].depth = depth;
TransTable[key].count = count;
for(i = 0; i < 8; i++) TransTable[key].rank[i] = prank[i];
TransTable[key].value = val;
}
void AddtoTransTable(Position *p, int count)
{
unsigned long key, i, j, shift;
unsigned long prank[8];
key = HashPosition(p);
for(i = 0; i < 8; i++) prank[i] = 0;
for(i = 2; i < 10; i++) {
for(j = 2; j < 10; j++) {
shift = (j-2) * 4;
switch(p->board[i][j]) {
case EMPTY :
break;
case WHITE + PAWN :
prank[i-2] += (1uL << shift);
break;
case WHITE + KNIGHT :
prank[i-2] += (1uL << (++shift));
break;
case WHITE + BISHOP :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
case WHITE + ROOK :
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + QUEEN :
prank[i-2] += (1uL << shift);
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + KING :
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + PAWN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + KNIGHT :
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + BISHOP :
prank[i-2] += (1uL << shift);
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + ROOK :
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + QUEEN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + KING :
shift += 2;
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
}
}
}
if(TransTable[key].depth != -1) {
if(prank[0] == TransTable[key].rank[0])
if(prank[1] == TransTable[key].rank[1])
if(prank[2] == TransTable[key].rank[2])
if(prank[3] == TransTable[key].rank[3])
if(prank[4] == TransTable[key].rank[4])
if(prank[5] == TransTable[key].rank[5])
if(prank[6] == TransTable[key].rank[6])
if(prank[7] == TransTable[key].rank[7]) {
TransTable[key].depth = Minval(TransTable[key].depth, count);
return; }
if(count > TransTable[key].depth) return;
}
TransTable[key].depth = count;
TransTable[key].count = 0;
for(i = 0; i < 8; i++) TransTable[key].rank[i] = prank[i];
TransTable[key].value = 0;
}
int IsTransposition(Position *p, int count)
{
unsigned long i, j, shift, key;
unsigned long prank[8];
key = HashPosition(p);
if(TransTable[key].depth == -1) return 0;
for(i = 0; i < 8; i++) prank[i] = 0;
for(i = 2; i < 10; i++) {
for(j = 2; j < 10; j++) {
shift = (j-2) * 4;
switch(p->board[i][j]) {
case EMPTY :
break;
case WHITE + PAWN :
prank[i-2] += (1uL << shift);
break;
case WHITE + KNIGHT :
prank[i-2] += (1uL << (++shift));
break;
case WHITE + BISHOP :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
case WHITE + ROOK :
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + QUEEN :
prank[i-2] += (1uL << shift);
shift += 2;
prank[i-2] += (1uL << shift);
break;
case WHITE + KING :
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + PAWN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
prank[i-2] += (1uL << (++shift));
break;
case BLACK + KNIGHT :
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + BISHOP :
prank[i-2] += (1uL << shift);
shift += 3;
prank[i-2] += (1uL << shift);
break;
case BLACK + ROOK :
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + QUEEN :
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
shift += 2;
prank[i-2] += (1uL << shift);
break;
case BLACK + KING :
shift += 2;
prank[i-2] += (1uL << shift);
prank[i-2] += (1uL << (++shift));
break;
}
}
}
if(prank[0] == TransTable[key].rank[0])
if(prank[1] == TransTable[key].rank[1])
if(prank[2] == TransTable[key].rank[2])
if(prank[3] == TransTable[key].rank[3])
if(prank[4] == TransTable[key].rank[4])
if(prank[5] == TransTable[key].rank[5])
if(prank[6] == TransTable[key].rank[6])
if(prank[7] == TransTable[key].rank[7])
{
if(count >= TransTable[key].depth) return 1;
else return 2;
}
return 3;
}