public BoardCalculator(
ReadOnlyBlockadeState state)
{
this._state = state;
this._connectedComponentLabels = new Lazy <Grid <NullableInt> >(() => ComputeConnectedComponents(state));
}
public double EvaluateState(ReadOnlyBlockadeState state, int player, IBlockadeHeuristic blockadeHeuristic)
{
return(state.IsGameOver()
? (state.CurrentPlayer == player
? blockadeHeuristic.WinScore
: blockadeHeuristic.LossScore)
: blockadeHeuristic.EvaluateState(state, player));
}
public double EvaluateState(ReadOnlyBlockadeState state, int player)
{
return(Enumerable.Range(0, state.PlayerCount)
.Where(thisPlayer => !state.IsPlayerOut(thisPlayer))
.Select(thisPlayer => (thisPlayer == player ? 1.0 : -1.0)
* (GetReachableCellScore(state, thisPlayer) * 100.0
+ GetNeighborAversionScore(state, thisPlayer) * 1.0))
.Sum());
}
public int PickMove(List <Move> moves, ReadOnlyBlockadeState state)
{
var tuple = this._singleLevelMoveEvaluator.PickBestMove(moves, state, new HelmutBlockadeHeuristic());
return(tuple != null
? tuple.Item1
// all moves kill me, so pick a random one
: this._random.Next(moves.Count));
}
public double EvaluateState(ReadOnlyBlockadeState state, int player)
{
var weights = new[] { 20, 15, 10 };
return(weights.Select((weight, i) =>
state.GetBoardCalculator()
.GetD1Neighbors(state.GetCurrentLocationOfPlayer(player), distance: i + 1)
.Sum(l => (state.GetCell(l).IsEmpty() ? 1 : -1) * weight))
.Sum());
}
public Tuple <int, double> PickBestMove(List <Move> moves, ReadOnlyBlockadeState state, IBlockadeHeuristic blockadeHeuristic)
{
return(moves.Select((move, i) => new { nextState = state.MakeMove(move), move, i })
.Where(a => a.nextState.GetBoardCalculator().GetD1Neighbors(a.move.Location, distance: 1)
.Where(l => a.nextState.GetCell(l).IsEmpty())
.Any())
.Select(a => Tuple.Create(this.EvaluateState(a.nextState, state.CurrentPlayer, blockadeHeuristic), a.i))
.OrderByDescending(t => t)
.Select(t => Tuple.Create(t.Item2, t.Item1))
.FirstOrDefault());
}
public double GetReachableCellScore(ReadOnlyBlockadeState state, int player)
{
using (var step = this._myProfiler.Step("sophie evaluate state - reachable"))
{
// so we cant check the reachable count for the current position of the player because that space is
// occupied, but we can check all the places they can go and get the max of that as an analog
return(state.GetMoves(player)
.Select(move => state.GetBoardCalculator().GetReachableCellCount(move.Location))
.Max());
}
}
public double GetNeighborAversionScore(ReadOnlyBlockadeState state, int player)
{
using (var step = this._myProfiler.Step("mira evaluate state - neighbor"))
{
var weights = new[] { 20, 15, 10 };
return(weights.Select((weight, i) =>
state.GetBoardCalculator()
.GetD1Neighbors(state.GetCurrentLocationOfPlayer(player), distance: i + 1)
.Sum(l => (state.GetCell(l).IsEmpty() ? 1 : -1) * weight))
.Sum());
}
}
public Tuple <int, double> PickBestMove(List <Move> moves, ReadOnlyBlockadeState state, IBlockadeHeuristic heuristic, int levels)
{
if (levels == 0)
{
var singleLevelResult = this._singleLevelMoveEvaluator.PickBestMove(moves, state, heuristic);
return(singleLevelResult != null
? singleLevelResult
: Tuple.Create(0, heuristic.LossScore));
}
return(moves.Select((m, i) => Tuple.Create(i, this.TryAllOtherPlayerMoves(state.MakeMove(m), heuristic, levels, state.CurrentPlayer)))
.OrderByDescending(t => Tuple.Create(t.Item2, this._random.Next()))
.First());
}
// static so it can be used in a lazy
private static Grid <NullableInt> ComputeConnectedComponents(ReadOnlyBlockadeState state)
{
var labels = Grid.Create(state.Rows, state.Cols, (row, col) => new NullableInt(default(int?)));
var currentLabel = 0;
state.GetBoard().ForEach((location, cell) =>
{
if (cell.IsEmpty() && !labels[location].HasValue)
{
ApplyLabel(state, labels, location, currentLabel);
currentLabel++;
}
});
return(labels);
}
private static void ApplyLabel(ReadOnlyBlockadeState state, Grid <NullableInt> labels, Location location, int label)
{
Throw.If(labels[location].HasValue);
labels[location] = new NullableInt(label);
GetD1Neighbors(state, location, distance: 1)
.ToList()
.ForEach(newLocation =>
{
// not using Where() because we need to evaluate condition immediately before recursing
if (!labels[newLocation].HasValue && state.GetCell(newLocation).IsEmpty())
{
ApplyLabel(state, labels, newLocation, label);
}
});
}
// static so it can be shared with other statics
private static IEnumerable <Location> GetD1Neighbors(ReadOnlyBlockadeState state, Location location, int distance)
{
if (distance == 1)
{
return(new[]
{
Location.Create(location.Row - 1, location.Col),
Location.Create(location.Row + 1, location.Col),
Location.Create(location.Row, location.Col - 1),
Location.Create(location.Row, location.Col + 1)
}.Where(l => IsLocationOnBoard(state, l)));
}
return(Enumerable.Range(0, distance + 1)
.Select(x => Tuple.Create(x, distance - x))
.SelectMany(t => new[] { t, Tuple.Create(-t.Item1, t.Item2), Tuple.Create(t.Item1, -t.Item2), Tuple.Create(-t.Item1, -t.Item2) })
.Select(delta => Location.Create(row: location.Row + delta.Item1, col: location.Col + delta.Item2))
.Where(l => IsLocationOnBoard(state, l))
.Distinct());
}
public int PickMove(List <Move> moves, ReadOnlyBlockadeState state)
{
var okayMoves = moves.Select((m, i) =>
{
var nextState = state.MakeMove(m);
return(nextState.GetBoardCalculator()
.GetD1Neighbors(m.Location, distance: 1)
.Where(l => nextState.GetCell(l).IsEmpty())
.Any()
? i
: default(int?));
})
.Where(i => i.HasValue)
.Select(i => i.Value)
.ToList();
return(okayMoves.Count > 0
? okayMoves[this._random.Next(okayMoves.Count)]
: 0);
}
public double TryAllOtherPlayerMoves(ReadOnlyBlockadeState state, IBlockadeHeuristic heuristic, int levels, int myselfPlayer)
{
if (state.IsGameOver())
{
return(state.CurrentPlayer == myselfPlayer
? heuristic.WinScore
: heuristic.LossScore);
}
if (state.CurrentPlayer == myselfPlayer)
{
return(this.PickBestMove(state.GetMoves().ToList(), state, heuristic, levels - 1).Item2);
}
return(state.GetMoves()
.Select(state.MakeMove)
.Select(newState => newState.GetCurrentLocationOfPlayer(myselfPlayer) == null
? heuristic.LossScore
: newState.CurrentPlayer == myselfPlayer
? this.PickBestMove(newState.GetMoves().ToList(), newState, heuristic, levels - 1).Item2
: this.TryAllOtherPlayerMoves(newState, heuristic, levels, myselfPlayer))
.Average());
}
public int PickMove(List <Move> moves, ReadOnlyBlockadeState state)
{
return(this._random.Next(moves.Count));
}
public int PickMove(List <Move> moves, ReadOnlyBlockadeState state)
{
var tuple = this._simpleMultiLevelEvaluator.PickBestMove(moves, state, new MiraBlockadeHeuristic(this._myProfiler), levels: 1);
return(tuple.Item1);
}
public double EvaluateState(ReadOnlyBlockadeState state, int player)
{
return(GetReachableCellScore(state, player) * 100.0
+ GetNeighborAversionScore(state, player) * 1.0);
}
private static bool IsLocationOnBoard(ReadOnlyBlockadeState state, Location location)
{
return(location.Row >= 0 && location.Row < state.Rows &&
location.Col >= 0 && location.Col < state.Cols);
}
