public GoChain(GoBlock goBlock, Region AccessibleLiberties)
{
Blocks = new List<GoBlock>();
Blocks.Add(goBlock);
Liberities = new Region(goBlock.Liberties, AccessibleLiberties, Region.MergeType.And);
UsedLiberities = new List<int>();
}
public Region(Region region)
{
Width = region.Width;
Count = region.Count;
Grid = new bool[Width * Width];
region.Grid.CopyTo(Grid, 0);
}
public Region(Region region1, Region region2, MergeType mergeType)
{
Width = region1.Width;
Count = region1.Count;
Grid = new bool[Width * Width];
if (region1.Width != region2.Width)
return; // error: can't merge unlike regions
if (mergeType == MergeType.And)
{
for (int i = 0; i < Width * Width; i++)
if ((region1.Grid[i]) && (region2.Grid[i]))
Add(i);
}
else
if (mergeType == MergeType.Or)
{
for (int i = 0; i < Width * Width; i++)
if ((region1.Grid[i]) || (region2.Grid[i]))
Add(i);
}
else
if (mergeType == MergeType.NAnd)
{
for (int i = 0; i < Width * Width; i++)
if ((region1.Grid[i]) && (!region2.Grid[i]))
Add(i);
}
}
public void AddBlock(GoBlock goBlock)
{
Blocks.Add(goBlock);
if (Liberities != null)
Liberities.Add(goBlock.Liberties);
else
Liberities = new Region(goBlock.Liberties);
}
protected static int BlockNbrCounter = 0; // used for debugging
#endregion Fields
#region Constructors
public GoBlockBase(GoBoard goBoard, Color blockColor)
{
Board = goBoard;
BlockColor = blockColor;
AdjacentBlocks = new GoBlocksAdjacentCollection(this);
Members = new Region(Board.BoardSize);
MemberList = new List<int>();
BlockNbr = ++BlockNbrCounter;
}
public void Remove(Region region)
{
if (region.Width != Width)
return; // error: can't merge unlike regions
if ((Count == 0) || (region.Count == 0))
return;
for (int i = 0; i < Width * Width; i++)
if (region.Contains(i))
Remove(i);
}
public void Or(Region region)
{
if ((Count == 0) && (region.Count == 0))
return;
if (region.Width != Width)
return; // error: can't merge unlike regions
for (int i = 0; i < Width * Width; i++)
if (region.Contains(i))
Add(i);
}
public bool IsSame(Region region)
{
if (Count != region.Count)
return false;
for (int i = 0; i < Width * Width; i++)
if (region.Contains(i) != Contains(i))
return false;
return true;
}
public GoEmptyBlock(GoEmptyBlock goEmptyBlock, int pCutPoint, int direction)
: base(goEmptyBlock.Board, Color.Empty)
{
Members = new Region(goEmptyBlock.Members, pCutPoint, direction);
MemberList = Members.ToList();
}
/// <summary>
/// Initializes a new instance of the <see cref="GoBlock"/> class.
/// </summary>
/// <param name="goBoard">The board.</param>
/// <param name="color">The color of the block.</param>
public GoBlock(GoBoard goBoard, Color color)
: base(goBoard, color)
{
Liberties = new Region(goBoard.BoardSize);
}
protected bool CreateBlocksConnectionStrategy(Region accessibleLibertiesAvailable, MiaiStrategy miaiStrategy)
{
List<int> lUsedLiberties = new List<int>((EnclosingBlocks.Count + InteriorDefenderBlocks.Count) * 2);
List<GoChain> lGoChains = new List<GoChain>(EnclosingBlocks.Count + InteriorDefenderBlocks.Count);
List<GoChain> lCheckList = new List<GoChain>(lGoChains.Count);
// future, if any the of the blocks only have one liberty in Accessible, then no strategy
foreach (GoBlock lBlock in EnclosingBlocks)
{
GoChain lGoBlocks = new GoChain(lBlock, accessibleLibertiesAvailable);
lGoChains.Add(lGoBlocks);
lCheckList.Add(lGoBlocks);
}
foreach (GoBlock lBlock in InteriorDefenderBlocks)
{
GoChain lGoBlocks = new GoChain(lBlock, accessibleLibertiesAvailable);
lGoChains.Add(lGoBlocks);
lCheckList.Add(lGoBlocks);
}
List<int> lProtectedLiberties = GetProtectedLiberties();
// merge chains based on shared points
while (lGoChains.Count != 1)
{
List<GoChain> lRemoved = new List<GoChain>(lGoChains.Count);
List<GoChain> lChanged = new List<GoChain>(lGoChains.Count);
if (Version >= 2004)
{
// merge chains based on protected liberty chaining
if (lGoChains.Count > 1)
{
foreach (int lProtected in lProtectedLiberties)
{
int lCaptureMove = Board.AnyEmptyLibertyAround(lProtected);
// Console.Error.WriteLine("Protected: " + GoBoard.Coord.ToString(lProtected) + " Stop: " + (GoBoard.Coord.ToString(lCaptureMove)));
if (!lUsedLiberties.Contains(lCaptureMove))
{
List<GoChain> lChains = new List<GoChain>();
foreach (GoChain lGoChain in lGoChains)
if (lGoChain.IsLiberty(lProtected))
if (!lRemoved.Contains(lGoChain))
lChains.Add(lGoChain);
if (lChains.Count >= 2)
{
//Console.Error.WriteLine("Merging: " + lChains[0].ToString());
//Console.Error.WriteLine(" with: " + lChains[1].ToString());
lChains[0].MergeGoChain(lChains[1]);
lChanged.Add(lChains[0]);
lRemoved.Add(lChains[1]);
if (lChains.Count == 3)
{
// Console.Error.WriteLine(" and: " + lChains[1].ToString());
lChains[0].MergeGoChain(lChains[2]);
lRemoved.Add(lChains[2]);
}
miaiStrategy.Add(lProtected, lCaptureMove);
lUsedLiberties.Remove(lProtected);
lUsedLiberties.Remove(lCaptureMove);
}
}
}
}
foreach (GoChain lGoChain in lGoChains)
if (!lRemoved.Contains(lGoChain))
foreach (GoChain lGoChain2 in lCheckList)
if (lGoChain != lGoChain2)
if (!lRemoved.Contains(lGoChain2))
{
List<int> lSharedPoints = lGoChain.SharedLibertyPoints(lGoChain2);
// sort list by best (near optimal) shared points to use
if (lSharedPoints.Count >= 2)
{
List<int> lBestSharedPoints = new List<int>(2);
// find best share points to use for the Miai Stragety
// a. find points which only have one empty neightbor
foreach (int lIndex in lSharedPoints)
{
int lEmptyNeighborCount = 0;
foreach (int lNieghbor in Board.Coord.GetNeighbors(lIndex))
if (accessibleLibertiesAvailable.Contains(lNieghbor))
lEmptyNeighborCount++;
if (lEmptyNeighborCount == 1)
{
lBestSharedPoints.Add(lIndex);
if (lBestSharedPoints.Count == 2)
break;
}
}
// b. find point near the last use shared point (from previous step), if any
if (lBestSharedPoints.Count == 1)
{
int lBestSharedPoint = lBestSharedPoints[0];
foreach (int lNieghbor in Board.Coord.GetNeighbors(lBestSharedPoint))
if (lSharedPoints.Contains(lNieghbor))
{
lBestSharedPoints.Add(lNieghbor);
break;
}
}
// c. use any remaining shared points (not always optimal, but okay)
if (lBestSharedPoints.Count < 2)
foreach (int lIndex in lSharedPoints)
if (!lBestSharedPoints.Contains(lIndex))
{
lBestSharedPoints.Add(lIndex);
if (lBestSharedPoints.Count == 2)
break;
}
lSharedPoints = lBestSharedPoints;
lGoChain.MergeGoChain(lGoChain2, lSharedPoints);
lChanged.Add(lGoChain);
lRemoved.Add(lGoChain2);
miaiStrategy.Add(lSharedPoints[0], lSharedPoints[1]);
lUsedLiberties.Remove(lSharedPoints[0]);
lUsedLiberties.Remove(lSharedPoints[1]);
}
}
}
if (lChanged.Count == 0)
break;
foreach (GoChain lGoChain in lRemoved)
lGoChains.Remove(lGoChain);
lCheckList = lChanged;
}
if (lGoChains.Count > 1)
return false;
foreach (int lPoint in lUsedLiberties)
accessibleLibertiesAvailable.Remove(lPoint);
return true;
}
public Region GetEdges()
{
Region lRegion = new Region(this.Width);
for (int i = 0; i < Width * Width; i++)
if (!IsInterior(i))
lRegion.Add(i);
return lRegion;
}
public void Add(Region region)
{
if (region.Width != Width)
return; // error: can't merge unlike regions
for (int i = 0; i < Width * Width; i++)
if (region.Grid[i] == true)
Add(i);
}
public Region(Region region, int cutPoint, int start)
{
Width = region.Width;
Count = 0;
Grid = new bool[Width * Width];
CoordinateSystem lCoord = CoordinateSystem.GetCoordinateSystem(Width);
if (!lCoord.OnBoard(start))
return;
Stack<int> lFill = new Stack<int>();
lFill.Push(start);
while (lFill.Count > 0)
{
int lAt = lFill.Pop();
Add(lAt);
foreach (int lNeighbor in lCoord.GetNeighbors(lAt))
if ((lNeighbor != cutPoint)
&& (region.Contains(lNeighbor))
&& (!Contains(lNeighbor)))
lFill.Push(lNeighbor);
}
}
public List<int> SharedLibertyPoints(GoChain goChain)
{
List<int> lSharedLibertyPoints = new List<int>();
if ((Liberities.Count <= 1) || (goChain.Liberities.Count <= 1))
return lSharedLibertyPoints;
Region lShared = new Region(Liberities, goChain.Liberities, Region.MergeType.And);
foreach (int lPoint in UsedLiberities)
lShared.Remove(lPoint);
foreach (int lPoint in goChain.UsedLiberities)
lShared.Remove(lPoint);
lSharedLibertyPoints = lShared.ToList();
return lSharedLibertyPoints;
}
public bool IsOneVital()
{
if (Is1Vital.IsKnown)
return (Is1Vital.IsTrue);
if (EnclosingBlocks.Count == 0)
{
Is1Vital = TriState.False;
return false;
}
// step 1
// build miai stragety
MiaiStrategy = new MiaiStrategy();
Region lAccessibleLibertiesAvailable = new Region(AccessibleLiberties);
if (!CreateBlocksConnectionStrategy(lAccessibleLibertiesAvailable, MiaiStrategy))
{
Is1Vital = TriState.False;
return false;
}
// step 2
// future: add miai accessible interior empty points to the set of accessible liberties,
// and also use protected liberties for the chaining.
Region lNewAccessibleRegion = new Region(AccessibleLiberties);
foreach (GoBlock lGoBlock in InteriorDefenderBlocks)
lNewAccessibleRegion.Add(lGoBlock.Liberties);
// step 2a - add miai accessible interior empty points to the set of accessible liberties
// rough implementation
Region lMiaiAccessibleInteriorRegion = new Region(Board.BoardSize);
if (Version >= 2004)
{
foreach (int lIndex in EmptyArea)
if (!lNewAccessibleRegion.Contains(lIndex))
{
List<int> llAccessibleNeighborPoints = new List<int>(4);
foreach (int lNeighbor in Board.Coord.GetNeighbors(lIndex))
if (lNewAccessibleRegion.Contains(lNeighbor))
llAccessibleNeighborPoints.Add(lNeighbor);
if (llAccessibleNeighborPoints.Count >= 2)
{
lMiaiAccessibleInteriorRegion.Add(lIndex);
}
}
}
lNewAccessibleRegion.Add(lMiaiAccessibleInteriorRegion);
// step 3
Region lEmptyAndNotAccessible = new Region(EmptyArea);
lEmptyAndNotAccessible.Remove(lNewAccessibleRegion);
List<int> lList = lEmptyAndNotAccessible.ToList();
int lMinAdjacent = 2;
while (lList.Count != 0)
{
List<int> lRemove = new List<int>();
foreach (int lIndex in lList)
{
List<int> lAccessibleLibertiesForPoint = new List<int>(4);
foreach (int lNeighbor in Board.Coord.GetNeighbors(lIndex))
if (lNewAccessibleRegion.Contains(lNeighbor))
lAccessibleLibertiesForPoint.Add(lNeighbor);
if (lAccessibleLibertiesForPoint.Count < 2)
{
Is1Vital = TriState.False;
return false;
}
if ((lAccessibleLibertiesForPoint.Count == 2) || (lAccessibleLibertiesForPoint.Count == lMinAdjacent))
{
lNewAccessibleRegion.Remove(lAccessibleLibertiesForPoint[0]);
lNewAccessibleRegion.Remove(lAccessibleLibertiesForPoint[1]);
MiaiStrategy.Add(lIndex, lAccessibleLibertiesForPoint[0], lAccessibleLibertiesForPoint[1]);
lRemove.Add(lIndex);
lMinAdjacent = 2;
}
}
if (lList.Count == lRemove.Count)
lList.Clear();
else
foreach (int lPoint in lRemove)
lList.Remove(lPoint);
if (lRemove.Count == 0)
lMinAdjacent++;
}
Is1Vital = TriState.True;
return true;
}
public Region GetInterior()
{
Region lRegion = new Region(this.Width);
if (Count != 0)
for (int i = 0; i < Width * Width; i++)
if (IsInterior(i))
lRegion.Add(i);
return lRegion;
}
protected Region _EnclosingBlocksLibertyArea; // lazy evaluation
#endregion Fields
#region Constructors
public ColorEnclosedRegion(GoEmptyBlock goEmptyBlock, Color defender)
{
Board = goEmptyBlock.Board;
Defender = defender;
Size = 0;
Version = 2004;
_RegionNbr = goEmptyBlock.BlockNbr;
Members = new List<GoBlockBase>();
EmptyBlocks = new List<GoEmptyBlock>();
Neighbors = new List<GoBlock>();
InteriorAttackerBlocks = new List<GoBlock>();
Is2Vital = TriState.Unknown;
Is1Vital = TriState.Unknown;
IsSmall = TriState.Unknown;
_EnclosedArea = null;
_EmptyRegion = null;
Stack<GoBlockBase> lWork = new Stack<GoBlockBase>();
lWork.Push(goEmptyBlock);
while (lWork.Count != 0)
{
GoBlockBase lGoBlockBase = lWork.Pop();
if (!Members.Contains(lGoBlockBase))
{
Members.Add(lGoBlockBase);
if (lGoBlockBase.IsEmptyBlock())
{
EmptyBlocks.Add((GoEmptyBlock)lGoBlockBase);
Size = Size + ((GoEmptyBlock)lGoBlockBase).EmptySpaceCount;
}
else
{
InteriorAttackerBlocks.Add((GoBlock)lGoBlockBase);
Size = Size + ((GoBlock)lGoBlockBase).StoneCount;
}
foreach (GoBlockBase lGoBlockBaseAdjacent in lGoBlockBase.AdjacentBlocks.AllBlocks)
if (lGoBlockBaseAdjacent.BlockColor == Defender)
{
if (!Neighbors.Contains((GoBlock)lGoBlockBaseAdjacent))
Neighbors.Add((GoBlock)lGoBlockBaseAdjacent);
}
else
if (!Members.Contains(lGoBlockBaseAdjacent))
lWork.Push(lGoBlockBaseAdjacent);
}
}
EnclosingBlocks = new List<GoBlock>(Neighbors.Count);
InteriorDefenderBlocks = new List<GoBlock>();
foreach (GoBlock lGoBlock in Neighbors)
{
bool lFound = false;
foreach (GoEmptyBlock lGoEmptyBlock in lGoBlock.AdjacentBlocks.EmptyBlocks)
{
if (!EmptyBlocks.Contains(lGoEmptyBlock))
{
lFound = true;
break;
}
}
if (lFound)
EnclosingBlocks.Add(lGoBlock);
else
InteriorDefenderBlocks.Add(lGoBlock);
}
if (EnclosingBlocks.Count == 0)
InteriorDefenderBlocks.Clear();
}
public bool Intersects(Region region)
{
if ((Count == 0) || (region.Count == 0))
return false;
for (int i = 0; i < Width * Width; i++)
if (region.Contains(i) && Contains(i))
return true;
return false;
}
public bool IsOnlyAdjacent(Region region)
{
if ((Count == 0) || (region.Count == 0))
return false;
for (int i = 0; i < Width * Width; i++)
if (region.Contains(i))
if (!IsAdjacent(i))
return false;
return true;
}
public GoEmptyBlock(GoBlock goBlock)
: base(goBlock.Board, Color.Empty)
{
Members = new Region(goBlock.Members);
MemberList = Members.ToList(); // slow might be a faster way
}
