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#include "phalanx.h"
typedef struct { unsigned f, t; } killentry;
killentry RK[H9][H9]; /* reaction killer */
unsigned HK[H9][H9]; /* history killer table */
unsigned Maxhist = 1;
void init_killers(void)
{
memset( RK, 0, H9*H9*sizeof(killentry) );
memset( HK, 0, H9*H9*sizeof(unsigned) );
Maxhist = 1;
}
void write_killer( int from, int to )
{
if( B[to] == 0 )
{
RK[G[Counter-1].m.from][G[Counter-1].m.to].f = from;
RK[G[Counter-1].m.from][G[Counter-1].m.to].t = to;
HK[from][to] += Depth/10 + 1;
if( HK[from][to] > Maxhist )
{
Maxhist = HK[from][to];
if( Maxhist > 4000 )
{
int f,t;
Maxhist /= 2;
for( f=A1; f!=H9; f++ )
for( t=A1; t!=H9; t++ )
HK[f][t] /= 2;
}
}
}
}
/*
* We are in a cut node, but the 1st killer was not successful.
* Let's lower the history killer values of the unsuccessful ones
* to magnify the importance of the successful one.
*/
void slash_killers( tmove *m, int n )
{
int i;
int findnewmax=0;
for( i=0; i!=n; i++ )
{
if( HK[m[i].from][m[i].to] == Maxhist ) findnewmax = 1;
HK[m[i].from][m[i].to] /= 2;
}
if( findnewmax )
{
int f,t;
Maxhist /= 2;
for( f=A1; f!=H9; f++ ) for( t=A1; t!=H9; t++ )
if( HK[f][t] > Maxhist ) Maxhist = HK[f][t];
}
}
void add_killer( tmove *m, int n, thashentry *ht )
{
int i, f=0, t=0;
tmove *mpv = &PV[0][Ply];
tmove *mlv = &PV[Ply][Ply];
if( Depth > 0 )
{
f = RK[G[Counter-1].m.from][G[Counter-1].m.to].f;
t = RK[G[Counter-1].m.from][G[Counter-1].m.to].t;
}
for( i=0; i!=n; i++ )
{
register tmove *m1 = m+i;
if( FollowPV )
{
if(
( mpv->special && mpv->special==m1->special )
||
( !mpv->special && m1->from == mpv->from
&& m1->to == mpv->to
&& m1->in2a == mpv->in2a )
)
m1->value = CHECKMATE;
}
else
{
if( m1->from == mlv->from
&& m1->to == mlv->to
&& ( mlv->in2 == 0 || m1->in2 == mlv->in2 )
&& m1->in2a == mlv->in2a ) m1->value += 350;
if( ht != NULL ) if( ht->move != 0 )
if( ht->move == smove(m1) ) m1->value = CHECKMATE;
}
if( m1->value != CHECKMATE )
{
/* mopv - moving piece value */
int mopv = Values[ m1->in2a >> 4 ];
if( m1->in2 ) /* capture */
{
m1->value += Values[ m1->in2>>4 ];
/* capture of last moved piece */
if( m1->to == G[Counter-1].m.to ) m1->value += 150;
if( Color==WHITE )
{
if( P[m1->to]&0xFF00 )
m1->value -= ( mopv / 4 );
else m1->value += 150;
}
else
{
if( P[m1->to]&0x00FF )
m1->value -= ( mopv / 4 );
else m1->value += 150;
}
if( m1->value < 30 ) m1->value = 30;
if( Depth > 200 )
{
m1->value += see( B, m1->from, m1->to );
if(m1->value<0) m1->value=20;
}
}
/* non captures - look at the power tables */
else if( mopv>P_VALUE )
{
if( Color==WHITE )
{
/* leaving attacked square */
if(P[m1->from]&0xFF00) m1->value += mopv/20;
/* going to attacked square */
if(P[m1->to]&0xFF00) m1->value -= mopv/15;
}
else
{
if(P[m1->from]&0x00FF) m1->value += mopv/20;
if(P[m1->to]&0x00FF) m1->value -= mopv/15;
}
}
if( m1->in1 != m1->in2a ) /* pawn promotion */
m1->value += Values[ m1->in2a>>4 ] - P_VALUE;
if( Depth > 0 )
{
if( m1->from == f && m1->to == t )
m1->value += max(Depth,50);
if( HK[ m1->from ][ m1->to ] )
m1->value +=
1 + HK[ m1->from ][ m1->to ] * 500 / Maxhist;
}
}
}
}
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