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Consider improving for LMP #124

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merged 3 commits into from
Jul 7, 2021
Merged

Consider improving for LMP #124

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3d63fc9
Bench: 6111415
Aryan1508 Jul 6, 2021
3b3825c
Bench: 5166408
Aryan1508 Jul 6, 2021
74759fd
Bench: 5166408
Aryan1508 Jul 6, 2021
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17 changes: 13 additions & 4 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,9 +29,11 @@

int lmr_reductions_array[64][64]{0};

std::atomic_bool SEARCH_ABORT = ATOMIC_VAR_INIT(false);
int lmp_margin[64][2]{0};
int quiet_lmp_margin[64]{0};

constexpr int see_pruning_margins[5] {
constexpr int see_pruning_margins[5]
{
0, -100, -100, -300, -325
};

Expand Down Expand Up @@ -168,6 +170,9 @@ namespace
}

int eval = tthit ? entry.seval : eval_position(position);
search.eval[search.stats.ply] = eval;

bool improving = eval > search.eval[std::max(0, search.stats.ply - 2)];

if (!at_root && !in_check && depth < 6 && (eval - depth * 170) >= beta)
return eval;
Expand All @@ -192,10 +197,10 @@ namespace

for (Move move; picker.next(move);)
{
if (move_num > 3 + depth * depth)
if (move_num > lmp_margin[depth][improving])
picker.skip_quiets = true;

if (picker.stage >= MovePicker::Stage::GiveQuiet && move_num > depth * depth + 2)
if (picker.stage >= MovePicker::Stage::GiveQuiet && move_num > quiet_lmp_margin[depth])
break;

if (depth < 5 && move_is_capture(position, move) && move.score < see_pruning_margins[depth])
Expand Down Expand Up @@ -343,6 +348,10 @@ namespace Search
{
lmr_reductions_array[i][j] = log(i) * log(j);
}

lmp_margin[i][1] = 3 + 2 * i * i;
lmp_margin[i][0] = 3 + i * i / 1.5;
quiet_lmp_margin[i] = 2 + i * i;
}
}

Expand Down
4 changes: 3 additions & 1 deletion src/search.h
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Expand Up @@ -33,11 +33,13 @@ namespace Search
HistoryTable history = {0};
HistoryTable capture_history = {0};

int eval[64] = {0};

void update();
};

void init();
uint64_t bestmove(Info&, bool log);
}

extern std::atomic_bool SEARCH_ABORT;
inline std::atomic_bool SEARCH_ABORT = ATOMIC_VAR_INIT(false);
2 changes: 1 addition & 1 deletion src/uci.cpp
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Expand Up @@ -27,7 +27,7 @@
#include "polyglot.h"
#include <cstring>

const char *version = "7.41";
const char *version = "7.42";

namespace
{
Expand Down