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Hearts: Let the AI pick better lead cards

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Instead of picking the card with the lowest value we should pick the
card with the highest value for which we know no lower value card is
in play anymore and that someone else still has an even higher value
card.
This commit is contained in:
Gunnar Beutner 2021-05-22 11:21:56 +02:00 • committed by Linus Groh
parent c2a4b581fe
commit 1ae18c1228
4 changed files with 64 additions and 18 deletions
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37
Userland/Games/Hearts/Game.cpp
View file

@ -161,6 +161,32 @@ void Game::timer_event(Core::TimerEvent&)
update();
}
bool Game::other_player_has_lower_value_card(Player& player, Card& card)
{
for (auto& other_player : m_players) {
if (&player != &other_player) {
for (auto& other_card : other_player.hand) {
if (other_card && card.type() == other_card->type() && hearts_card_value(*other_card) < hearts_card_value(card))
return true;
}
}
}
return false;
}
bool Game::other_player_has_higher_value_card(Player& player, Card& card)
{
for (auto& other_player : m_players) {
if (&player != &other_player) {
for (auto& other_card : other_player.hand) {
if (other_card && card.type() == other_card->type() && hearts_card_value(*other_card) > hearts_card_value(card))
return true;
}
}
}
return false;
}
#define RETURN_CARD_IF_VALID(card) \
do { \
auto card_index = (card); \
@ -177,8 +203,15 @@ size_t Game::pick_card(Player& player)
auto clubs_2 = player.pick_specific_card(Card::Type::Clubs, CardValue::Number_2);
VERIFY(clubs_2.has_value());
return clubs_2.value();
} else
return player.pick_low_points_low_value_card();
} else {
auto valid_card = [this, &player](Card& card) {
return is_valid_play(player, card);
};
auto prefer_card = [this, &player](Card& card) {
return !other_player_has_lower_value_card(player, card) && other_player_has_higher_value_card(player, card);
};
return player.pick_lead_card(move(valid_card), move(prefer_card));
}
}
auto* high_card = &m_trick[0];
for (auto& card : m_trick)