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Add perft 'divide' command

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To show perft numbers for each move. Just
use 'divide' instead of 'perft', for instance:

position startpos moves e2e4 e7e5
divide 4

Inspired by Ronald de Man.

No functional change.
This commit is contained in:
Marco Costalba
2014-05-24 04:31:36 +02:00
parent 88b5100e29
commit e49eb67119
2 changed files with 16 additions and 3 deletions
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13
src/benchmark.cpp
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@@ -23,6 +23,7 @@
#include <vector>
#include "misc.h"
#include "notation.h"
#include "position.h"
#include "search.h"
#include "thread.h"
@@ -136,7 +137,17 @@ void benchmark(const Position& current, istream& is) {
cerr << "\nPosition: " << i + 1 << '/' << fens.size() << endl;
if (limitType == "perft")
if (limitType == "divide")
for (MoveList<LEGAL> it(pos); *it; ++it)
{
StateInfo si;
pos.do_move(*it, si);
uint64_t cnt = limits.depth > 1 ? Search::perft(pos, (limits.depth - 1) * ONE_PLY) : 1;
pos.undo_move(*it);
cerr << move_to_uci(*it, pos.is_chess960()) << ": " << cnt << endl;
nodes += cnt;
}
else if (limitType == "perft")
{
uint64_t cnt = Search::perft(pos, limits.depth * ONE_PLY);
cerr << "\nPerft " << limits.depth << " leaf nodes: " << cnt << endl;