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ChessEngine: Add ChessEngine

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This engine is pretty bad, but doesn't let itself get checkmated
This commit is contained in:
Peter Elliott 2020-08-20 17:04:08 -06:00 • committed by Andreas Kling
parent fb62eed058
commit 1e57e32a93
10 changed files with 501 additions and 3 deletions
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80
Libraries/LibChess/Chess.cpp
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@ -425,8 +425,8 @@ bool Board::apply_illegal_move(const Move& move, Colour colour)
if (move.to == Square("a8") || move.to == Square("c8")) {
set_piece(Square("e8"), EmptyPiece);
set_piece(Square("a8"), EmptyPiece);
set_piece(Square("c8"), { Colour::White, Type::King });
set_piece(Square("d8"), { Colour::White, Type::Rook });
set_piece(Square("c8"), { Colour::Black, Type::King });
set_piece(Square("d8"), { Colour::Black, Type::Rook });
return true;
} else if (move.to == Square("h8") || move.to == Square("g8")) {
set_piece(Square("e8"), EmptyPiece);
@ -463,6 +463,23 @@ bool Board::apply_illegal_move(const Move& move, Colour colour)
return true;
}
Move Board::random_move(Colour colour) const
{
if (colour == Colour::None)
colour = turn();
Move move = { { 50, 50 }, { 50, 50 } };
int probability = 1;
generate_moves([&](Move m) {
if (rand() % probability == 0)
move = m;
++probability;
return IterationDecision::Continue;
});
return move;
}
Board::Result Board::game_result() const
{
bool sufficient_material = false;
@ -533,6 +550,65 @@ Board::Result Board::game_result() const
return Result::StaleMate;
}
Colour Board::game_winner() const
{
if (game_result() == Result::CheckMate)
return opposing_colour(turn());
return Colour::None;
}
int Board::game_score() const
{
switch (game_winner()) {
case Colour::White:
return +1;
case Colour::Black:
return -1;
case Colour::None:
return 0;
}
return 0;
}
bool Board::game_finished() const
{
return game_result() != Result::NotFinished;
}
int Board::material_imbalance() const
{
int imbalance = 0;
Square::for_each([&](Square square) {
int value = 0;
switch (get_piece(square).type) {
case Type::Pawn:
value = 1;
break;
case Type::Knight:
case Type::Bishop:
value = 3;
break;
case Type::Rook:
value = 5;
break;
case Type::Queen:
value = 9;
break;
default:
break;
}
if (get_piece(square).colour == Colour::White) {
imbalance += value;
} else {
imbalance -= value;
}
return IterationDecision::Continue;
});
return imbalance;
}
bool Board::is_promotion_move(const Move& move, Colour colour) const
{
if (colour == Colour::None)