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proof.c
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proof.c
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/*
Sjeng - a chess variants playing program
Copyright (C) 2000-2001 Gian-Carlo Pascutto
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
File: proof.c
Purpose: contains functions related to the pn-search
*/
#include "sjeng.h"
#include "extvars.h"
#include "protos.h"
#include "limits.h"
#include "math.h"
#define FALSE 0
#define TRUE 1
#define UNKNOWN 2
#define STALEMATE 3 /* special case because pn-search only assumes 1/0 */
#define PN_INF 100000000
/* we can exceed PBSize before exiting the main search loop */
#define SAFETY 10000
/* define this to use the pn^2 search */
#undef PN2
int nodecount;
int nodecount2;
int pn2;
int frees;
int iters;
int forwards;
int maxply;
int ply;
int pn_time;
move_s pn_move;
move_s pn_saver;
bool kibitzed;
int forcedwin;
int rootlosers[PV_BUFF];
int alllosers;
typedef struct node
{
unsigned char value;
unsigned char num_children;
unsigned char expanded;
unsigned char evaluated;
int proof;
int disproof;
struct node **children;
struct node *parent;
move_s move;
}
node_t;
void pn2_eval (node_t *node);
void suicide_pn_eval (node_t *this);
void std_pn_eval (node_t *this);
void losers_pn_eval (node_t *this);
unsigned char *membuff;
int bufftop = 0;
void* Xmalloc(int size)
{
int oldtop = bufftop;
bufftop += size;
return (&membuff[oldtop]);
};
void Xfree(void)
{
bufftop = 0;
};
void freenodes (node_t * node)
{
int i;
if (!node)
return;
if (node->children)
{
if (node->num_children > 0)
{
for (i = 0; i < (node->num_children); i++)
{
if (node->children[i] != 0)
{
freenodes (node->children[i]);
};
};
free (node->children);
}
};
free (node);
};
void pn_eval(node_t * this)
{
if (Variant == Suicide)
{
suicide_pn_eval(this);
}
else if (Variant == Losers)
{
losers_pn_eval(this);
}
else
{
std_pn_eval(this);
}
}
void std_pn_eval (node_t * this)
{
int num_moves;
move_s moves[MOVE_BUFF];
int mate;
int i;
this->evaluated = TRUE;
//ep_temp = ep_square;
if ((white_to_move && is_attacked (wking_loc, WHITE))
|| (!white_to_move && is_attacked (bking_loc, BLACK)))
{
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
mate = TRUE;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, TRUE))
{
mate = FALSE;
unmake (&moves[0], i);
break;
};
unmake (&moves[0], i);
}
if (mate == TRUE)
{
/* proven or disproven */
if (ToMove == root_to_move)
{
/* root mover is mated-> disproven */
this->value = FALSE;
}
else
{
this->value = TRUE;
};
}
else
{
this->value = UNKNOWN;
};
}
else
{
this->value = UNKNOWN;
};
//ep_square = ep_temp;
};
void suicide_pn_eval(node_t *this)
{
int j, a, i;
int wp = 0, bp = 0;
int egscore;
this->evaluated = TRUE;
if (piece_count <= 3 && (Variant == Suicide) && SEGTB)
{
egscore = egtb(white_to_move);
if (egscore != -128)
{
if (egscore > 0)
{
if (ToMove == root_to_move)
{
this->value = TRUE;
return;
}
else
{
this->value = FALSE;
return;
}
}
else if (egscore < 0)
{
if (ToMove == root_to_move)
{
this->value = FALSE;
return;
}
else
{
this->value = TRUE;
return;
}
}
else
{
this->value = UNKNOWN;
return;
}
}
}
for (j = 1, a = 1; (a <= piece_count); j++)
{
i = pieces[j];
if (!i)
continue;
else
a++;
switch (board[i])
{
case wpawn:
case wbishop:
case wrook:
case wking:
case wqueen:
case wknight: wp++; break;
case bpawn:
case bbishop:
case brook:
case bking:
case bqueen:
case bknight: bp++; break;
}
if (wp && bp) break;
}
if (!wp)
{
/* white has no pieces */
/* proven or disproven */
if (!root_to_move)
{
/* root mover is mated-> proven */
this->value = TRUE;
}
else
{
this->value = FALSE;
};
}
else if (!bp)
{
/* black has no pieces */
if (!root_to_move)
{
/* root mover is mated-> disproven */
this->value = FALSE;
}
else
{
this->value = TRUE;
};
}
else
{
this->value = UNKNOWN;
};
};
void losers_pn_eval(node_t *this)
{
int num_moves;
move_s moves[MOVE_BUFF];
int mate;
int i;
int j, a;
int wp = 0, bp = 0;
this->evaluated = TRUE;
//ep_temp = ep_square;
for (j = 1, a = 1; (a <= piece_count); j++)
{
i = pieces[j];
if (!i)
continue;
else
a++;
switch (board[i])
{
case wpawn:
case wbishop:
case wrook:
case wqueen:
case wknight: wp++; break;
case bpawn:
case bbishop:
case brook:
case bqueen:
case bknight: bp++; break;
}
if (wp && bp) break;
}
if (!wp)
{
/* proven or disproven */
if (!root_to_move)
{
/* root mover is mated-> disproven */
this->value = TRUE;
}
else
{
this->value = FALSE;
};
return;
}
else if (!bp)
{
if (root_to_move)
{
/* root mover is mated-> disproven */
this->value = TRUE;
}
else
{
this->value = FALSE;
};
return;
}
if ((white_to_move && is_attacked(wking_loc, WHITE))
|| (!white_to_move && is_attacked(bking_loc, BLACK)))
{
captures = TRUE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
captures = FALSE;
mate = TRUE;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, TRUE))
{
mate = FALSE;
unmake(&moves[0], i);
break;
};
unmake(&moves[0], i);
}
if (mate == TRUE)
{
/* no legal capture..do non-captures */
captures = FALSE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, TRUE))
{
mate = FALSE;
unmake(&moves[0], i);
break;
};
unmake(&moves[0], i);
}
}
if (mate == TRUE)
{
/* proven or disproven */
if (ToMove == root_to_move)
{
/* root mover is mated-> disproven */
this->value = TRUE;
}
else
{
this->value = FALSE;
};
}
else
{
this->value = UNKNOWN;
};
}
else
{
this->value = UNKNOWN;
};
//ep_square = ep_temp;
};
node_t *select_most_proving (node_t * node)
{
int i;
node_t *tnode;
tnode = node;
while (tnode->expanded)
{
if (ToMove == root_to_move)
{
i = 0;
while (tnode->children[i]->proof != tnode->proof)
{
i++;
};
}
else
{
i = 0;
while (tnode->children[i]->disproof != tnode->disproof)
{
i++;
};
};
tnode = tnode->children[i];
hash_history[move_number+ply-1] = hash;
make (&tnode->move, 0);
if (ply > maxply)
maxply = ply;
};
return tnode;
};
void set_proof_and_disproof_numbers (node_t * node)
{
int proof;
int disproof;
int i;
move_s moves[MOVE_BUFF];
int l, num_moves;
int reploop;
int ic;
if (node->expanded)
{
if (ToMove != root_to_move)
{
proof = 0;
disproof = +PN_INF;
for (i = 0; i < node->num_children; i++)
{
proof += node->children[i]->proof;
if (proof > PN_INF)
proof = PN_INF;
if (node->children[i]->disproof < disproof)
{
disproof = node->children[i]->disproof;
}
}
if ((proof == 0) || (disproof == PN_INF))
{
forwards++;
StoreTT(+INF-500, +INF, -INF, -1, 0, 200);
}
else if ((disproof == 0) || (proof == PN_INF))
{
forwards++;
StoreTT(-INF+500, +INF, -INF, -1, 0, 200);
}
}
else
{
disproof = 0;
proof = +PN_INF;
for (i = 0; i < node->num_children; i++)
{
disproof += node->children[i]->disproof;
if (disproof > PN_INF)
disproof = PN_INF;
if (node->children[i]->proof < proof)
{
proof = node->children[i]->proof;
}
}
if ((proof == 0) || (disproof == PN_INF))
{
forwards++;
StoreTT(+INF-500, +INF, -INF, -1, 0, 200);
}
else if ((disproof == 0) || (proof == PN_INF))
{
forwards++;
StoreTT(-INF+500, +INF, -INF, -1, 0, 200);
}
}
hash_history[move_number+ply-1] = hash;
node->proof = proof;
node->disproof = disproof;
}
else if (node->evaluated)
{
if (node->value == UNKNOWN)
{
hash_history[move_number+ply-1] = hash;
if (is_draw() || ply > 200)
{
node->proof = 50000;
node->disproof = 50000;
return;
}
//ept = ep_square;
if (Variant != Losers)
{
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
ic = in_check();
if (Variant != Suicide)
{
l = 0;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, ic))
{
l++;
}
unmake (&moves[0], i);
};
}
else
{
l = numb_moves;
};
}
else
{
/* Losers...this a bit more messy */
l = 0;
captures = TRUE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
captures = FALSE;
ic = in_check();
if (num_moves)
{
for (i = 0; i < num_moves; i++)
{
make(&moves[0], i);
if (check_legal(&moves[0], i, ic))
{
l++;
}
unmake(&moves[0], i);
}
}
//
//ep_square = ept;
if (!l)
{
captures = FALSE;
num_moves = 0;
gen(&moves[0]);
num_moves = numb_moves;
for (i = 0; i < num_moves; i++)
{
make(&moves[0], i);
if (check_legal(&moves[0], i, ic))
{
l++;
}
unmake(&moves[0], i);
}
};
}
if (l == 0)
{
/* might be stalemate too */
node->proof = 1;
node->disproof = 1;
}
else if (ToMove == root_to_move) /* OR */
{
if ((Variant != Suicide) && (Variant != Losers))
{
node->proof = 1 + floor(ply / 50);
node->disproof = l + floor(ply / 50);
}
else
{
if (Variant == Losers)
{
/* this is probably a bogus line,
so breathen the tree */
if (phase == Endgame)
{
node->proof = 1 + floor(ply / 30);
node->disproof = l + floor(ply / 30);
}
else
{
node->proof = 1 + floor(ply / 80);
node->disproof = l + floor(ply / 80);
}
}
else
{
node->proof = 1 + floor(ply / 150);
node->disproof = l + floor(ply / 150);
}
}
}
else
{
if ((Variant != Suicide) && (Variant != Losers))
{
node->proof = l + floor(ply / 50);
node->disproof = 1 + floor(ply / 50);
}
else
{
if (Variant == Losers)
{
if (phase == Endgame)
{
node->proof = l + floor(ply/30);
node->disproof = 1 + floor(ply/30);
}
else
{
node->proof = l + floor(ply/80);
node->disproof = 1 + floor(ply/80);
}
}
else
{
node->proof = l + floor(ply / 150);
node->disproof = 1 + floor(ply / 150);
}
}
}
//ep_square = ept;
}
else if (node->value == FALSE)
{
node->proof = +PN_INF;
node->disproof = 0;
}
else if (node->value == TRUE)
{
node->proof = 0;
node->disproof = +PN_INF;
}
else if (node->value == STALEMATE)
{
/* don't look at this node, its a dead-end */
node->proof = 50000;
node->disproof = 50000;
};
}
else
{
node->proof = node->disproof = 1;
}
}
void develop_node (node_t * node)
{
int num_moves;
move_s moves[MOVE_BUFF];
int i, l;
node_t *newnode;
#ifdef PN2
node_t **newchildren;
#endif
int leg;
int ic;
//ept = ep_square;
#ifdef PN2
if (!pn2)
pn2_eval(node);
#endif
ic = in_check();
if (Variant != Losers)
{
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
}
else
{
captures = TRUE;
leg = FALSE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
captures = FALSE;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, ic))
{
leg = TRUE;
unmake(&moves[0], i);
break;
};
unmake(&moves[0], i);
}
if (leg == FALSE)
{
captures = FALSE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
}
}
#ifdef PN2
if (pn2)
#endif
node->children = (node_t **) Xmalloc (num_moves * sizeof (node_t **));
#ifdef PN2
else
newchildren = (node_t **) malloc (num_moves * sizeof (node_t **));
#endif
l = 0;
for (i = 0; i < num_moves; i++)
{
hash_history[move_number+ply-1] = hash;
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, ic))
{
#ifdef PN2
if (pn2)
#endif
newnode = (node_t *) Xmalloc (sizeof (node_t));
#ifdef PN2
else
newnode = (node_t *) malloc (sizeof (node_t));
#endif
newnode->value = 0;
#ifdef PN2
if (!pn2)
{
newnode->proof = node->children[l]->proof;
newnode->disproof = node->children[l]->disproof;
}
else
{
#endif
newnode->proof = newnode->disproof = 1;
#ifdef PN2
};
#endif
newnode->num_children = 0;
newnode->parent = node;
newnode->evaluated = FALSE;
newnode->expanded = FALSE;
newnode->move = moves[i];
#ifdef PN2
if (!pn2)
newchildren[l] = newnode;
else
#endif
node->children[l] = newnode;
l++;
#ifdef PN2
if (pn2 == FALSE)
/*use delayed eval */;
else if (pn2)
#endif
pn_eval (newnode);
#ifdef PN2
if (pn2)
#endif
set_proof_and_disproof_numbers (newnode);
unmake (&moves[0], i);
}
else
unmake (&moves[0], i);
};
node->expanded = TRUE;
node->num_children = l;
#ifdef PN2
if (!pn2)
node->children = newchildren;
#endif
/* account for stalemate ! */
if (node->num_children == 0)
{
node->expanded = FALSE;
node->evaluated = TRUE;
if (Variant != Suicide && Variant != Losers)
{
node->value = STALEMATE;
}
else
{
if (ToMove == root_to_move)
{
node->value = TRUE;
}
else
{
node->value = FALSE;
}
};
};
#ifdef PN2
if (pn2)
nodecount2 += num_moves;
else
#endif
nodecount += num_moves;
frees += num_moves;
//ep_square = ept;
#ifdef PN2
if (!pn2) Xfree();
#endif
};
void update_ancestors (node_t * node)
{
node_t *tnode, *prevnode;
tnode = node;
prevnode = node;
while (tnode != 0)
{
set_proof_and_disproof_numbers (tnode);
prevnode = tnode;
if (tnode->move.target != 0)
{ /* traverse */
unmake (&tnode->move, 0);
}
tnode = tnode->parent;
};
if (prevnode->move.target != 0)
{
make (&prevnode->move, 0);
}
return;
};
void
pn2_eval (node_t * root)
{
node_t *mostproving;
#ifdef PN2
node_t *newroot;
#endif
node_t *currentnode;
node_t *oldparent;
nodecount2 = 0;
pn2 = TRUE;
oldparent = root->parent;
root->parent = 0;
pn_eval (root);
set_proof_and_disproof_numbers (root);
currentnode = root;
while (root->proof != 0 && root->disproof != 0 && nodecount2 < nodecount )