/** Finds inferior cells, builds vcs. Sets moves to consider to all
empty cells. If fillin causes terminal state, sets
m_fillinCausedWin to true and recomputes fillin/vcs with ice
temporarily turned off (so it can pass the players a non-empty
consider set).
*/
HexPoint BenzenePlayer::InitSearch(HexBoard& brd, HexColor color,
bitset_t& consider, double& score)
{
// Resign if the game is already over
Groups groups;
GroupBuilder::Build(brd.GetPosition(), groups);
if (groups.IsGameOver())
{
score = IMMEDIATE_LOSS;
return RESIGN;
}
StoneBoard original(brd.GetPosition());
brd.ComputeAll(color);
m_fillinCausedWin = false;
m_fillinWinner = EMPTY;
if (brd.GetGroups().IsGameOver())
{
// Fillin caused win, remove and re-compute without ice.
m_fillinCausedWin = true;
m_fillinWinner = brd.GetGroups().GetWinner();
LogInfo() << "Captured cells caused win! Removing...\n";
brd.GetPosition().SetPosition(original);
bool oldUseIce = brd.UseICE();
brd.SetUseICE(false);
brd.ComputeAll(color);
brd.SetUseICE(oldUseIce);
BenzeneAssert(!brd.GetGroups().IsGameOver());
}
consider = brd.GetPosition().GetEmpty();
score = 0;
return INVALID_POINT;
}
