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staticeval.d
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staticeval.d
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import tango.util.Convert;
import alphabeta;
import goalsearch;
import logging;
import movement;
import position;
import trapmoves;
struct SCNode
{
ulong zobrist;
int score;
}
class ScoreCache
{
SCNode[] cache;
this(int size)
{
cache.length = size;
}
void set_size(int size)
{
cache.length = size;
}
SCNode* get(Position pos)
{
return &cache[pos.zobrist % cache.length];
}
}
class StaticEval
{
Logger logger;
Position pos;
FastFAME fame;
GoalSearchDT goals;
TrapGenerator trap_search;
ulong[2] safe_traps;
ulong[2] active_traps;
int[64] pstrengths;
int[13] piece_value;
ulong hostages;
ulong frames;
ulong weakframers;
ScoreCache sc_cache;
real map_e_w = 2;
real tsafety_w = 1;
real ontrap_w = 1;
real frozen_w = 1;
real rwall_w = 1;
real ropen_w = 2;
real rhome_w = 3;
real rweak_w = 1;
real rstrong_w = 1;
real pstrength_w = 0.00005;
real goal_w = 1;
real static_otrap_w = 0.6;
real static_strap_w = 0.5;
real hostage_w = 1;
real frame_w = 1;
real mobility_w = 1;
real threat_w = 1;
this(Logger l, GoalSearchDT g, TrapGenerator t)
{
logger = l;
goals = g;
trap_search = t;
fame = new FastFAME(0.1716);
sc_cache= new ScoreCache(200000);
}
bool set_option(char[] option, char[] value)
{
bool handled = true;
switch (option)
{
case "eval_map_e":
map_e_w = to!(real)(value);
break;
case "eval_tsafety":
tsafety_w = to!(real)(value);
break;
case "eval_frozen":
frozen_w = to!(real)(value);
break;
case "eval_ontrap":
ontrap_w = to!(real)(value);
break;
case "eval_rwall":
rwall_w = to!(real)(value);
break;
case "eval_ropen":
ropen_w = to!(real)(value);
break;
case "eval_rhome":
rhome_w = to!(real)(value);
break;
case "eval_rweak":
rweak_w = to!(real)(value);
break;
case "eval_rstrong":
rstrong_w = to!(real)(value);
break;
case "eval_pstrength":
pstrength_w = to!(real)(value) * 0.00001;
break;
case "eval_goal":
goal_w = to!(real)(value);
break;
case "eval_static_otrap":
static_otrap_w = to!(real)(value);
break;
case "eval_static_strap":
static_strap_w = to!(real)(value);
break;
case "eval_hostage":
hostage_w = to!(real)(value);
break;
case "eval_frame":
frame_w = to!(real)(value);
break;
case "eval_mobility":
mobility_w = to!(real)(value);
break;
case "eval_threat":
threat_w = to!(real)(value);
break;
case "eval_cache_size":
sc_cache.set_size(to!(int)(value));
break;
default:
handled = false;
}
return handled;
}
int trap_safety()
{
static const int[] BOTH_SAFE = [-5, 5];
static const int[] WHITE_SAFE = [20, 80];
static const int[] BLACK_SAFE = [-80, -20];
int score = 0;
safe_traps[Side.WHITE] = 0;
safe_traps[Side.BLACK] = 0;
ulong traps = TRAPS;
while (traps)
{
ulong trap = traps & -traps;
traps ^= trap;
bitix tix = bitindex(trap);
Side tside = (trap > TRAP_C3) ? Side.BLACK : Side.WHITE;
ulong neighbors = neighbors_of(trap);
int[2] n_pop;
n_pop[Side.WHITE] = popcount(neighbors & pos.placement[Side.WHITE]);
n_pop[Side.BLACK] = popcount(neighbors & pos.placement[Side.BLACK]);
Piece[2] strongest_near;
strongest_near[Side.WHITE] = pos.strongest[Side.WHITE][tix];
strongest_near[Side.BLACK] = pos.strongest[Side.BLACK][tix];
while (neighbors)
{
ulong nbit = neighbors & -neighbors;
neighbors ^= nbit;
bitix nix = bitindex(nbit);
if (pos.strongest[Side.WHITE][nix] > strongest_near[Side.WHITE])
strongest_near[Side.WHITE] = pos.strongest[Side.WHITE][nix];
if (pos.strongest[Side.BLACK][nix] > strongest_near[Side.BLACK])
strongest_near[Side.BLACK] = pos.strongest[Side.BLACK][nix];
}
int trap_safe = 0;
if (!(active_traps[Side.BLACK] & trap)
&& pos.strongest[Side.WHITE][tix] != Piece.EMPTY
&& (pos.strongest[Side.WHITE][tix] + 6 >= strongest_near[Side.BLACK]
|| n_pop[Side.WHITE] > 1))
trap_safe |= 1;
if (!(active_traps[Side.WHITE] & trap)
&& pos.strongest[Side.BLACK][tix] != Piece.EMPTY
&& (pos.strongest[Side.BLACK][tix] - 6 >= strongest_near[Side.WHITE]
|| n_pop[Side.BLACK] > 1))
trap_safe |= 2;
switch (trap_safe)
{
case 0:
break;
case 1:
score += WHITE_SAFE[tside];
safe_traps[Side.WHITE] |= trap;
break;
case 2:
score += BLACK_SAFE[tside];
safe_traps[Side.BLACK] |= trap;
break;
case 3:
score += BOTH_SAFE[tside];
safe_traps[Side.WHITE] |= trap;
safe_traps[Side.BLACK] |= trap;
break;
}
}
return score;
}
// penalty for piece on trap
int on_trap()
{
//const int ON_TRAP[13] = [0, -6, -9, -12, -18, -33, -88,
// 6, 9, 12, 18, 33, 88];
const static real ON_TRAP_MUL = 0.02;
real score = 0;
ulong occupied_traps = ~pos.bitBoards[Piece.EMPTY] & TRAPS;
while (occupied_traps)
{
ulong tbit = occupied_traps & -occupied_traps;
occupied_traps ^= tbit;
bitix tix = bitindex(tbit);
Piece tpiece = pos.pieces[tix];
Side tside = (tpiece > Piece.WELEPHANT) ? Side.BLACK : Side.WHITE;
if (safe_traps[tside] & tbit)
{
score = -piece_value[tpiece] * ON_TRAP_MUL / 2.0;
} else {
score = -piece_value[tpiece] * ON_TRAP_MUL;
}
}
return cast(int)score;
}
int map_elephant()
{
const int[] CENTRAL_MAP =
[0, 1, 1, 2, 2, 1, 1, 0,
1, 2, 2, 4, 4, 2, 2, 1,
2, 3, 3, 6, 6, 3, 3, 2,
3, 4, 6, 6, 6, 6, 4, 3,
3, 4, 6, 6, 6, 6, 4, 3,
2, 3, 3, 6, 6, 3, 3, 2,
1, 2, 2, 4, 4, 2, 2, 1,
0, 1, 1, 2, 2, 1, 1, 0];
int score = 0;
if (pos.bitBoards[Piece.WELEPHANT])
score += CENTRAL_MAP[bitindex(pos.bitBoards[Piece.WELEPHANT])];
if (pos.bitBoards[Piece.BELEPHANT])
score -= CENTRAL_MAP[bitindex(pos.bitBoards[Piece.BELEPHANT])];
return score;
}
int rabbit_wall()
{
const int[2] BLOCKING_BONUS = [2, -2];
int score = 0;
for (Side s; s < 2; s++)
{
int p_rabbit = Piece.WRABBIT;
int p_cat = Piece.WCAT;
int p_dog = Piece.WDOG;
if (s == Side.BLACK)
{
p_rabbit = Piece.BRABBIT;
p_cat = Piece.BCAT;
p_dog = Piece.BDOG;
}
ulong rcandd = pos.bitBoards[p_rabbit] | pos.bitBoards[p_cat] | pos.bitBoards[p_dog];
ulong rabbits = pos.bitBoards[p_rabbit];
while (rabbits)
{
ulong rbit = rabbits & -rabbits;
rabbits ^= rbit;
ulong ladjacent = rbit & ~A_FILE;
if (ladjacent)
{
ladjacent = (ladjacent << 1) | (ladjacent << 9) | (ladjacent >> 7);
if (ladjacent & rcandd)
{
score += BLOCKING_BONUS[s];
}
} else {
score += BLOCKING_BONUS[s];
}
ulong radjacent = rbit & ~H_FILE;
if (radjacent)
{
radjacent = (radjacent >> 1) | (radjacent >> 9) | (radjacent << 7);
if (radjacent & rcandd)
{
score += BLOCKING_BONUS[s];
}
} else {
score += BLOCKING_BONUS[s];
}
}
}
return score;
}
int rabbit_open()
{
const int[8][2] NORABBIT_FILE = [[1, 1, 1, 2, 3, 5, 7, 0], [0, -7, -5, -3, -2, -1, -1, -1]];
const int[8][2] NORABBIT_ADJ = [[1, 1, 1, 2, 2, 4, 4, 0], [0, -4, -4, -2, -2, -1, -1, -1]];
const int[8][2] OPEN_FILE = [[2, 2, 2, 3, 10, 20, 40, 0], [0, -40, -20, -10, -3, -2, -2, -2]];
const int[8][2] OPEN_ADJ = [[2, 2, 3, 20, 40, 80, 120, 0], [0, -120, -80, -40, -20, -3, -2, -2]];
int score = 0;
for (int file=0; file < 8; file++)
{
ulong fmask = H_FILE << file;
ulong rabbits = fmask & pos.bitBoards[Piece.WRABBIT] & ~pos.frozen;
if (rabbits)
{
bitix rix = msbindex(rabbits);
ulong mask = H_FILE << rix;
if (!(pos.bitBoards[Piece.BRABBIT] & mask))
{
bool open_file = false;
int rank = rix/8;
score += NORABBIT_FILE[Side.WHITE][rank];
if (!(pos.placement[Side.BLACK] & mask))
{
open_file = true;
score += OPEN_FILE[Side.WHITE][rank];
}
ulong adj_mask = 0;
if (file != 0)
adj_mask = H_FILE << (rix+7);
if (file != 7)
adj_mask |= H_FILE << (rix+9);
if (!(pos.bitBoards[Piece.BRABBIT] & adj_mask))
{
score += NORABBIT_ADJ[Side.WHITE][rank];
adj_mask &= NOT_RANK_8;
if (open_file && !(pos.placement[Side.BLACK] & adj_mask))
{
score += OPEN_ADJ[Side.WHITE][rank];
}
}
}
}
rabbits = fmask & pos.bitBoards[Piece.BRABBIT] & ~pos.frozen;
if (rabbits)
{
bitix rix = bitindex(rabbits);
ulong rmask = A_FILE >> (63-rix);
if (!(pos.bitBoards[Piece.WRABBIT] & rmask))
{
bool open_file = false;
int rank = rix / 8;
score += NORABBIT_FILE[Side.BLACK][rank];
if (!(pos.placement[Side.WHITE] & rmask))
{
open_file = true;
score += OPEN_FILE[Side.BLACK][rank];
}
ulong adj_mask = 0;
if (file != 0)
adj_mask = A_FILE >> (63 - (rix-9));
if (file != 7)
adj_mask |= A_FILE >> (63 - (rix-7));
if (!(pos.bitBoards[Piece.WRABBIT] & adj_mask))
{
score += NORABBIT_ADJ[Side.BLACK][rank];
adj_mask &= NOT_RANK_1;
if (open_file && !(pos.placement[Side.WHITE] & adj_mask))
{
score += OPEN_ADJ[Side.BLACK][rank];
}
}
}
}
}
return score;
}
int rabbit_home()
{
const static int[] side_mul = [1, -1];
const static ulong[][] side_rank = [[RANK_1, RANK_2], [RANK_8, RANK_7]];
const static int FIRST_ROW = 3;
int score = 0;
for (Side side = Side.WHITE; side <= Side.BLACK; side++)
{
Piece rpiece = (side == Side.WHITE) ? Piece.WRABBIT : Piece.BRABBIT;
ulong rabbits = pos.bitBoards[rpiece];
score += popcount(side_rank[side][0] & rabbits) * FIRST_ROW * side_mul[side];
score += popcount(side_rank[side][1] & rabbits) * side_mul[side];
}
return score;
}
real rabbit_strength()
{
// Depends on goal search and trap safety being done first
const static int[] pieceval = [0, 0, 45, 80, 150, 200, 300,
0, -45, -80, -150, -200, -300];
const static int[] distval = [100, 100, 90, 75, 50,
10, 6, 3, 2, 1, 0, 0, 0, 0, 0, 0];
const static real[][] rankval = [[0, 0, 0.1, 0.2, 0.4, 1.0, 1.2, 0],
[0.0, -1.2, -1.0, -0.4, -0.2, -0.1, 0, 0]];
const static real[][] WEAK_MUL = [
[0.0, 0.00, 0.02, 0.05, 0.10, 0.20, 0.08, 0],
[0.0, 0.08, 0.20, 0.10, 0.05, 0.02, 0.00, 0]];
// Try to encourage rabbits to the edges.
const static real[] rsq = [0.0, 0, 0, 0, 0, 0, 0, 0,
0.05, 0.07, 0.09, 0.10, 0.10, 0.09, 0.07, 0.05,
0.11, 0.12, 0.14, 0.15, 0.15, 0.13, 0.12, 0.11,
0.10, 0.11, 0.13, 0.14, 0.14, 0.13, 0.11, 0.10,
0.09, 0.10, 0.11, 0.12, 0.12, 0.11, 0.10, 0.09,
0.09, 0.10, 0.10, 0.11, 0.11, 0.10, 0.10, 0.09,
0.07, 0.08, 0.08, 0.09, 0.09, 0.08, 0.08, 0.07,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ];
const static int INIT_BALANCE = -2000;
const static int WEAK_SPAN = 8000;
const static int STRONG_SPAN = 9000;
const static real STRONG_VAL = 450;
const ulong[] DEFENSE_SECTORS = [0xF8F8F8, 0x1F1F1F];
const static int[] rforward = [8, -8];
const static real[] side_mul = [1, -1];
real wscore = 0;
real sscore = 0;
ulong allpieces = (pos.placement[Side.WHITE] | pos.placement[Side.BLACK])
& ~pos.bitBoards[Piece.WRABBIT] & ~pos.bitBoards[Piece.BRABBIT]
& ~pos.frozen;
int[16] pval;
bitix[16] pixs;
int num_pieces;
while (allpieces)
{
ulong pbit = allpieces & -allpieces;
allpieces ^= pbit;
bitix pix = bitindex(pbit);
pval[num_pieces] = pieceval[pos.pieces[pix]];
pixs[num_pieces++] = pix;
}
for (Side s = Side.WHITE; s <= Side.BLACK; s++)
{
ulong rabbits;
Piece rabbit_piece;
if (s == Side.WHITE)
{
rabbit_piece = Piece.WRABBIT;
rabbits = pos.bitBoards[Piece.WRABBIT] & ~RANK_1;
} else {
rabbit_piece = Piece.BRABBIT;
rabbits = pos.bitBoards[Piece.BRABBIT] & ~RANK_8;
}
while (rabbits)
{
ulong rbit = rabbits & -rabbits;
rabbits ^= rbit;
bitix rix = bitindex(rbit);
uint forward = rix+rforward[s];
int power = 0;
for (int i=0; i < num_pieces; i++)
{
power += pval[i] * distval[taxicab_dist[forward][pixs[i]]];
}
power *= side_mul[s];
uint rfile = rix % 8;
ulong sector;
if (rfile < 5)
sector = DEFENSE_SECTORS[1];
if (rfile > 2)
sector |= DEFENSE_SECTORS[0];
if (s == Side.WHITE)
sector <<= 40;
int power_balance = INIT_BALANCE + (popcount(
pos.placement[s^1] & sector) * 400);
power -= power_balance;
// encourage rabbits to the edges
int rsi = rix;
if (s == Side.BLACK)
rsi = 63 - rsi;
wscore += -piece_value[rabbit_piece] * rsq[rsi];
if (power < 0)
{
real full_weak = WEAK_SPAN + power_balance;
real sfactor = -power / full_weak;
sfactor = (sfactor < 1) ? sfactor : 1;
real rval = -piece_value[rabbit_piece] * WEAK_MUL[s][rix/8]
* sfactor;
wscore += rval;
debug (rabbit_strength)
{
logger.log("weak r at {}, pf {}, rval {}",
ix_to_alg(rix), sfactor, rval);
}
}
else if (power > 0)
{
int full_strong = STRONG_SPAN + power_balance;
power = (power < full_strong) ? power : full_strong;
real sfactor = power / full_strong;
real rv = rankval[s][rix/8];
real rval = STRONG_VAL * rv * sfactor;
if (rbit & TRAPS)
rval *= 0.6;
if (!((safe_traps[s] & ~safe_traps[s^1]) & sector))
rval *= 0.5;
debug (rabbit_strength)
{
logger.log("strong r at {}, val {} final {} sector {:X} mst {:X} ost {:X}",
ix_to_alg(rix), rval, cast(int)(rval*rstrong_w),
sector, safe_traps[s], safe_traps[s^1]);
}
sscore += rval;
}
}
}
return (wscore * rweak_w) + (sscore * rstrong_w);
}
int piece_strength()
{
const static int[] pieceval = [0, 0, 8, 12, 24, 36, 44,
0, -8, -12, -24, -36, -44];
const static int[] distval = [100, 100, 95, 90, 85,
80, 40, 35, 30, 20, 1, 1, 1, 1, 0, 0];
const static int[][] pmul = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2],
[0, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2],
[0, 1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2],
[0, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2],
[0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2],
[0, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2],
[0, 1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2],
[0, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2],
[0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]];
const static int MAX_POWER = 4400; // == pieceval[Piece.WELEPHANT] * distval[0] * pmul;
const static int MIN_POWER = -4400; // == pieceval[Piece.BELEPHANT] * distval[0] * pmul;
bitix[16] ixs;
int value[16];
Piece piece[16];
int num_pieces = 0;
int score = 0;
ulong piece_bits = (pos.placement[Side.WHITE] | pos.placement[Side.BLACK])
& ~pos.bitBoards[Piece.WRABBIT] & ~pos.bitBoards[Piece.BRABBIT];
ulong pbits = piece_bits;
while (pbits)
{
ulong pbit = pbits & -pbits;
pbits ^= pbit;
bitix pix = bitindex(pbit);
piece[num_pieces] = pos.pieces[pix];
value[num_pieces] = pieceval[pos.pieces[pix]];
if (pbit & pos.frozen)
value[num_pieces] >>= 3;
ixs[num_pieces++] = pix;
}
debug (piece_strength)
{
logger.log("{}\n{}", "wb"[pos.side], pos.to_long_str());
}
for (int p = num_pieces; p--;)
{
int ppower = 0;
bitix pix = ixs[p];
for (int s = num_pieces; s--;)
{
if (s != p)
{
ppower += value[s] * distval[taxicab_dist[pix][ixs[s]]] * pmul[piece[p]][piece[s]];
}
}
ppower = (ppower < MAX_POWER) ? ppower : MAX_POWER;
ppower = (ppower > MIN_POWER) ? ppower : MIN_POWER;
pstrengths[pix] = ppower;
score += ppower;
debug (piece_strength)
{
logger.log("piece {} at {} has {} power",
pos.pieces[pix], ix_to_alg(pix), ppower);
}
}
debug (piece_strength)
{
logger.log("overall board piece strength {}", score);
}
return score;
}
int frozen_pieces()
{
static const int[13] FROZEN_PENALTY = [0, -6, -9, -12, -18, -33, -88,
6, 9, 12, 18, 33, 88];
static const real[33] POPULATION_MUL =
[0.8, 0.8, 0.8, 0.8, 0.8, 0.8, 0.8, 0.8, 0.8,
0.9, 0.9, 0.9, 0.9, 0.9, 0.9, 0.9, 0.9,
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
1.1, 1.1, 1.1, 1.1, 1.2, 1.2, 1.2, 1.2];
int score = 0;
for (int p=1; p < 12; p++)
{
score += popcount(pos.bitBoards[p] & pos.frozen) * FROZEN_PENALTY[p];
}
uint total_pop = popcount(~pos.bitBoards[Piece.EMPTY]);
assert (total_pop <= 32, "Less than 32 empty spaces on the board");
return cast(int)(score * POPULATION_MUL[total_pop]);
}
int mobility()
{
real check_hostage(ulong pbit, Side side, int pieceoffset,
ulong unsafe, ulong holders, int mobility)
{
//static const int[] HOSTAGE_VAL = [0, -10, -25, -39, -61, -150, -264,
// 10, 25, 39, 61, 150, 264];
static const real HOSTAGE_DIV = 2.0;
//static const int[] HOLDER_PENALTY = [0, 0, -4, -5, -10, -18, -44,
// 0, 4, 5, 10, 18, 44];
static const real HOLDER_DIV = 9.4;
static const real FROZEN_HOLDER_DIV = 4;
static const real[] TRAP_DIST_MUL =
[0.5, 0.5, 1.0, 0.5, 0.5, 1.0, 0.5, 0.5,
0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5,
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5,
0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5,
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5,
0.5, 0.5, 1.0, 0.5, 0.5, 1.0, 0.5, 0.5];
static const int[] NEAREST_TRAP =
[18, 18, 18, 18, 21, 21, 21, 21,
18, 18, 18, 18, 21, 21, 21, 21,
18, 18, 18, 18, 21, 21, 21, 21,
18, 18, 18, 18, 21, 21, 21, 21,
42, 42, 42, 42, 45, 45, 45, 45,
42, 42, 42, 42, 45, 45, 45, 45,
42, 42, 42, 42, 45, 45, 45, 45,
42, 42, 42, 42, 45, 45, 45, 45];
static const real[] MOBILE_MUL = [1.0, 0.3, 0.1, 0.05];
static const real EON_TRAP = 0.92;
static const real EN_OF_TRAP = 0.95;
static const real ENN_OF_TRAP = 0.98;
// FIXME: coverage does not include any rabbit movement
ulong coverage = neighbors_of(pos.placement[side] & ~pbit
& ~pos.bitBoards[Piece.WRABBIT+pieceoffset] & ~pos.frozen)
& pos.bitBoards[Piece.EMPTY] & ~unsafe;
for (int steps = 0; steps < 2; steps++)
{
coverage |= neighbors_of(coverage) & pos.bitBoards[Piece.EMPTY]
& ~unsafe;
}
real score = 0;
if (popcount(neighbors_of(pbit) & coverage) < 2)
{
bitix pix = bitindex(pbit);
// Should restrict the range -.2 to .2
real power_mul = pstrengths[pix] / (8800.0 * 5);
if (side)
power_mul = (power_mul < 0) ? 1+power_mul : 0.8;
else
power_mul = (power_mul > 0) ? 1-power_mul : 0.8;
// power_mul should now be .8 to 1
auto hpiece_value = piece_value[pos.pieces[pix]];
score = (-hpiece_value / HOSTAGE_DIV)
* TRAP_DIST_MUL[pix] * MOBILE_MUL[mobility] * power_mul;
Piece strong_holder = pos.strongest[side^1][pix];
score += -piece_value[strong_holder] / HOLDER_DIV;
bool hfrozen = false;
while (holders)
{
ulong hbit = holders & -holders;
holders ^= hbit;
auto hix = bitindex(hbit);
if (pos.pieces[hix] == strong_holder)
{
if (hbit & pos.frozen)
{
hfrozen = true;
} else {
hfrozen = false;
break;
}
}
}
if (hfrozen)
score /= FROZEN_HOLDER_DIV;
ulong nearest_trap = 1UL << NEAREST_TRAP[pix];
if (nearest_trap & pos.placement[side])
score *= EON_TRAP;
ulong near_neighbors = neighbors_of(nearest_trap)
& pos.placement[side] & ~pbit;
int neighbor_count = popcount(near_neighbors);
for (int i=0; i < neighbor_count; i++)
score *= EN_OF_TRAP;
ulong far_neighbors = neighbors_of(near_neighbors)
& pos.placement[side] & ~nearest_trap;
neighbor_count = popcount(far_neighbors);
for (int i=0; i < neighbor_count; i++)
score *= ENN_OF_TRAP;
hostages |= pbit;
if ((hpiece_value > 0 && score > 0)
|| (hpiece_value < 0 && score < 0))
score = 0;
debug (mobility)
{
logger.log("hostage piece {}{}, sc {}",
".RCDHMErcdhme"[pos.pieces[pix]],
ix_to_alg(pix), score);
}
}
return score * hostage_w;
}
real frame_check(ulong pbit, Side side, int enemyoffset)
{
/*
static const int[13] FRAMED_VAL = [0,
-100, -150, -200, -250, -325, -800,
100, 150, 200, 250, 325, 800];
static const int[13] PINNED_VAL = [0, 0, -8, -12, -20, -32, -88,
0, 8, 12, 20, 32, 88];
static const int[13] FRAMER_VAL = [0, 0, -2, -4, -6, -8, -22,
0, 2, 4, 6, 8, 22];
*/
static const real FRAMED_DIV = 4.0;
static const real PINNED_DIV = 34.0;
static const real FRAMER_DIV = 120.0;
bitix pix = bitindex(pbit);
frames |= pbit;
real score = 0;
ulong framers = neighbors_of(pbit) & pos.placement[side^1];
while (framers)
{
ulong frbit = framers & -framers;
framers ^= frbit;
bitix frix = bitindex(frbit);
if (pos.pieces[pix]
< pos.pieces[frix] + enemyoffset)
{
weakframers |= frbit;
}
score += -piece_value[pos.pieces[frix]] / FRAMER_DIV;
}
score += (-piece_value[pos.strongest[side][pix]] / PINNED_DIV)
+ (-piece_value[pos.pieces[pix]] / FRAMED_DIV);
debug (mobility)
{
logger.log("Found frame of {}{} worth {}",
".RCDHMErcdhme"[pos.pieces[pix]],
ix_to_alg(pix), score);
}
return score * frame_w;
}
//static const int[] BLOCKADE_VAL = [0, -1, -5, -10, -50, -150, -700,
// 1, 5, 10, 50, 150, 700];
static const real BLOCKADE_DIV = 3;
static const real[] MOBILITY_MUL = [1.0, 0.75, 0.5, 0.25];
static const real CLOSE_BLOCKADER_DIV = 80.0;
static const real FAR_BLOCKADER_DIV = 100.0;
// stronger close blockaders are possible hostage holders
static const real[] BLOCK_STRONGER_CL = [1.0, 0.6, 0.4, 0.2, 0.1];
static const real[] BLOCK_STRONGER_FAR = [1.0, 0.7, 0.5, 0.3, 0.2];
static const real[] BLOCK_EVEN_CL = [1.0, 0.75, 0.55];
static const real[] BLOCK_EVEN_FAR = [1.0, 0.9, 0.8];
static const real[] BLOCK_WEAK_CL = [1.0, 1.0, 1.0, 0.95, 0.9,
0.85, 0.8];
static const real[] BLOCK_WEAK_FAR = [1.0, 1.0, 1.0, 1.0, 0.98,
0.95, 0.92, 0.9, 0.88];
static const int[] MOBILE_VAL = [0, 20, 8, 2];
static const real[] SIDE_MUL = [0.1, -0.1];
hostages = 0;
frames = 0;
weakframers = 0;
real score = 0;
int[4][2] strongest_left;
ulong[5][16] reach_map;
ulong[16] freezes;
int pnum;
ulong[4][4][2] threat_map;
for (Side side = Side.WHITE; side <= Side.BLACK; side++)
{
int pieces_checked;
int pieceoffset = 0;
int enemyoffset = -6;
int pcorr = -6;
int mcorr = 0;
if (side == Side.BLACK)
{
pieceoffset = 6;
enemyoffset = 6;
pcorr = 0;
mcorr = -6;
}
ulong unsafe_traps = 0;
ulong tbits = TRAPS;
while (tbits)
{
ulong tbit = tbits & -tbits;
tbits ^= tbit;
if (popcount(neighbors_of(tbit) & pos.placement[side]) < 2)
{
unsafe_traps |= tbit;
}
}
ulong stronger;
ulong blockader_penalized = 0UL;
for (int p = Piece.WELEPHANT + pieceoffset;
p >= Piece.WCAT + pieceoffset; p--)
{
int epiece = p + mcorr;
int cutpiece = p + mcorr - 1;
ulong pieces = pos.bitBoards[p];
if (pieces)
{
pieces_checked++;
if (pieces_checked < 4)
strongest_left[side][pieces_checked] = epiece;
}
while (pieces)
{
ulong pbit = pieces & -pieces;
pieces ^= pbit;
ulong p_neighbors = neighbors_of(pbit);
piece_mobility(pos, pbit, stronger, reach_map[pnum],
freezes[pnum]);
int mobility = popcount(reach_map[pnum][4]);
// don't count the square the piece is on
mobility = mobility > 0 ? mobility - 1 : 0;
if (pieces_checked < 4)
{
score += (MOBILE_VAL[pieces_checked] * mobility)
* SIDE_MUL[side];
}
real fhscore = 0.;
if (mobility == 0 && (pbit & unsafe_traps))
{
fhscore = frame_check(pbit, side, enemyoffset);
}
else if (mobility <= 3 && (p_neighbors & stronger))
{
fhscore = check_hostage(pbit, side, pieceoffset,
unsafe_traps, p_neighbors & stronger,
mobility);
}
score += fhscore;
if (fhscore == 0 && mobility <= 3 && (pbit & ~pos.frozen))
{
real sc = (-piece_value[p] / BLOCKADE_DIV)
* MOBILITY_MUL[mobility];
ulong[2] blockaders;
blockaders[0] = neighbors_of(reach_map[pnum][4])
& pos.placement[side^1];
blockaders[1] = neighbors_of(blockaders[0])
& ~blockaders[0] & pos.placement[side^1];
int blk_num = popcount(blockaders[0] & stronger);
blk_num = blk_num > 4 ? 4 : blk_num;
sc *= BLOCK_STRONGER_CL[blk_num];
blk_num = popcount(blockaders[1] & stronger);
blk_num = blk_num > 4 ? 4 : blk_num;
sc *= BLOCK_STRONGER_FAR[blk_num];
blk_num = popcount(blockaders[0] & pos.bitBoards[epiece]);
assert (blk_num < 3);
sc *= BLOCK_EVEN_CL[blk_num];
blk_num = popcount(blockaders[1] & pos.bitBoards[epiece]);
assert (blk_num < 3);
sc *= BLOCK_EVEN_FAR[blk_num];
blk_num = popcount(blockaders[0] &
~(stronger | pos.bitBoards[epiece]));
blk_num = (blk_num < 6) ? blk_num : 6;
sc *= BLOCK_WEAK_CL[blk_num];
blk_num = popcount(blockaders[1] &
~(stronger | pos.bitBoards[epiece]));
blk_num = (blk_num < 8) ? blk_num : 8;
sc *= BLOCK_WEAK_FAR[blk_num];
real bpiece_penalty = 0;
while (blockaders[0]) {
ulong bbit = blockaders[0] & -blockaders[0];
blockaders[0] ^= bbit;
if (bbit & blockader_penalized)
continue;
blockader_penalized |= bbit;
bitix bix = bitindex(bbit);
bpiece_penalty += -piece_value[pos.pieces[bix]]
/ CLOSE_BLOCKADER_DIV;
if (bbit & TRAPS
& ~neighbors_of(pos.placement[side]
& ~pbit))
bpiece_penalty /= 10.0;
}
while (blockaders[1]) {
ulong bbit = blockaders[1] & -blockaders[1];
blockaders[1] ^= bbit;
if (bbit & blockader_penalized)
continue;
blockader_penalized |= bbit;
bitix bix = bitindex(bbit);
bpiece_penalty += -piece_value[pos.pieces[bix]]
/ FAR_BLOCKADER_DIV;
if (bbit & TRAPS
& ~neighbors_of(pos.placement[side]
& ~pbit))
bpiece_penalty /= 10.0;
}
if ((sc < 0 && sc + bpiece_penalty < 0)
|| (sc > 0 && sc + bpiece_penalty > 0))
score += sc + bpiece_penalty;
debug (mobility)
{
bitix pix = bitindex(pbit);
Piece ppiece = pos.pieces[pix];
logger.log("Found blockade of {}{} to be worth {} + {}",
".RCDHMErcdhme"[ppiece],
ix_to_alg(pix), sc, bpiece_penalty);
}
}
++pnum;
assert(pnum <= 16,
"Had more than 16 pieces in mobility eval");
}
stronger |= pos.bitBoards[p - enemyoffset];
}
}
pnum = 0;
for (Side side = Side.WHITE; side <= Side.BLACK; side++)
{
int pieces_checked;
int pieceoffset = 0;
int enemyoffset = -6;
int pcorr = -6;
int mcorr = 0;
if (side == Side.BLACK)
{
pieceoffset = 6;
enemyoffset = 6;
pcorr = 0;
mcorr = -6;
}
ulong stronger;
for (int p = Piece.WELEPHANT + pieceoffset;
p >= Piece.WCAT + pieceoffset; p--)
{
int epiece = p + mcorr;
int cutpiece = p + mcorr - 1;
ulong pieces = pos.bitBoards[p];
if (pieces)
{
pieces_checked++;
if (pieces_checked < 4)
strongest_left[side][pieces_checked] = epiece;
}
while (pieces)