public override bool HeuristicApplies(TekBoard board, TekField field)
{
List <TekArea> AdjacentAreas = field.Area.GetAdjacentAreas();
foreach (TekArea area in AdjacentAreas)
{
foreach (int value in field.PossibleValues)
{
bool possible = false;
Region.Clear();
foreach (TekField f in area.Fields)
{
if (f.ValuePossible(value))
{
if (field.Influencers.Contains(f))
{
Region.AddField(f);
}
else
{
possible = true;
break;
}
}
}
if (!possible && Region.Fields.Count > 0)
{
AddAffectedField(field);
AddValue(value);
AddHeuristicFields(Region.Fields);
}
}
}
return(AffectedFields.Count > 0 && HeuristicValues.Count > 0);
}
public override bool HeuristicApplies(TekBoard board, TekField field)
{
if (field.PossibleValues.Count == 0)
{
return(false);
}
for (int i = 0; i < field.PossibleValues.Count; i++) // note: foreach can not work since we modify during processing!
{
try
{
field.Value = field.PossibleValues[i]; // trying this value
foreach (TekField field1 in field.Influencers) // field must at least influence two other fields (which could now be pairs)
{
Region.AddField(field1);
foreach (TekField field2 in field.Influencers)
{
if (field1 != field2)
{
Region.AddField(field2);
foreach (TekField field3 in field1.CommonInfluencers(field2))
{
// and if there is a third field as well we might have the invalid configuration
if (Region.IsInvalidThreePairs(field3))
{
Region.AddField(field3);
AddHeuristicFields(Region.Fields);
AddAffectedField(field);
AddValue(field.Value);
return(true);
}
}
Region.RemoveField(field2);
}
}
}
}
finally
{
field.Value = 0;
}
}
Region.RemoveField(field);
return(false);
}
public override bool HeuristicApplies(TekBoard board, TekField field)
{
Region.Clear();
Region.AddField(field);
foreach (TekField field2 in field.Influencers)
{
Region.AddField(field2);
foreach (TekField field3 in field.Influencers)
{
if (field != field2 && field != field3 && field2 != field3)
{
if (Region.IsTriplet(field3))
{
Region.AddField(field3);
AddHeuristicFields(Region.Fields);
AddValues(Region.GetTotalPossibleValues());
// determine affected fields
foreach (TekField f in field.CommonInfluencers(field2, field3))
{
foreach (int value in f.PossibleValues)
{
if (HeuristicValues.Contains(value))
{
AddAffectedField(f);
break;
}
}
}
if (AffectedFields.Count > 0)
{
return(true);
}
else
{
Reset();
}
}
}
}
Region.RemoveField(field2);
}
return(false);
}
public override bool HeuristicApplies(TekBoard board, TekField field)
{
if (field.PossibleValues.Count != 2)
{
return(false);
}
Region.AddField(field);
foreach (TekField field2 in field.Influencers)
{
if (field == field2)
{
continue;
}
if (Region.IsPair(field2))
{
AddHeuristicFields(field, field2);
foreach (TekField f in field.CommonInfluencers(field2))
{
bool isAffected = false;
foreach (int value in field.PossibleValues)
{
if (f.ValuePossible(value))
{
isAffected = true;
break;
}
}
if (isAffected)
{
AddAffectedField(f);
}
}
AddValues(field.PossibleValues);
return(AffectedFields.Count > 0);
}
}
return(false);
}
public override bool HeuristicApplies(TekBoard board, TekField field)
{
foreach (TekField field2 in field.Influencers)
{
if (field2.PossibleValues.Count == 2 || field2.PossibleValues.Count == 3)
{
Region.AddField(field2);
foreach (TekField field3 in field.CommonInfluencers(field2))
{
if (field3.PossibleValues.Count == 2)
{
Region.AddField(field3);
foreach (TekField field4 in field2.CommonInfluencers(field3))
{
if (field4 != field && field4.PossibleValues.Count == 2 && Region.IsTriplet(field4, false))
{
foreach (int value in field.TotalPossibleValues(field2, field3))
{
if (field.ValuePossible(value) && field2.ValuePossible(value) && field3.ValuePossible(value) && !field4.ValuePossible(value))
{
Region.AddField(field4);
AddHeuristicFields(Region.Fields);
AddAffectedField(field);
AddValue(value);
return(true);
}
}
}
}
Region.RemoveField(field3);
}
}
Region.RemoveField(field2);
}
}
return(false);
}