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strategy.cpp
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// TODO: generalize to an arbitrary file input
// SELF
#include <strategy.hpp>
// OTHER MODULES
#include <settings.hpp>
// TODO: properly comment
action dealer_strategy(Hand const hand) {
const int value = hand.get_value();
// S17/H17 distinction
// Note: this also affects how players using naive dealer strategy play
// This is not necessarily a bug, so I did not make a distinction
if(value == 17 && hand.get_soft() && HIT_SOFT_SEVENTEEN) {
return action::hit;
}
if(value < 17) {
return action::hit;
}
return action::stand;
}
// TODO: properly comment
// TODO: currently automatically assumes DAS; fix
// TODO: refactor
action basic_strategy_general(Hand const hand, int const dealer_card) {
int player_value = hand.get_value();
bool can_split = hand.get_can_split();
bool can_double = hand.get_can_double();
bool can_surrender = hand.get_can_surrender();
// Every hand is either soft, a pair, or hard
if(hand.get_soft()) {
// soft
switch (player_value) {
case 12:
// same as a pair of aces
if(can_split) return action::split;
if(dealer_card == 6 && can_double) return action::double_down;
return action::hit;
case 13:
case 14:
switch (dealer_card) {
case 2:
case 3:
case 4:
return action::hit;
case 5:
case 6:
if(can_double) return action::double_down;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 15:
case 16:
switch (dealer_card) {
case 2:
case 3:
return action::hit;
case 4:
case 5:
case 6:
if(can_double) return action::double_down;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 17:
switch (dealer_card) {
case 2:
return action::hit;
case 3:
case 4:
case 5:
case 6:
if(can_double) return action::double_down;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 18:
switch (dealer_card) {
case 2:
if(HIT_SOFT_SEVENTEEN && can_double) return action::double_down;
return action::stand;
case 3:
case 4:
case 5:
case 6:
if(can_double) return action::double_down;
return action::stand;
case 7:
case 8:
return action::stand;
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 19:
if(HIT_SOFT_SEVENTEEN && can_double && dealer_card == 6) return action::double_down;
return action::stand;
case 20:
case 21:
return action::stand;
default:
return action::hit;
}
} else if(hand.get_pair()) {
// pair
int pair_card = hand.at(0);
switch (pair_card) {
case 2:
case 3:
switch (dealer_card) {
case 2:
case 3:
if(can_split && DOUBLE_AFTER_SPLIT) return action::split;
return action::hit;
case 4:
case 5:
case 6:
case 7:
if(can_split) return action::split;
return action::hit;
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 4:
switch (dealer_card) {
case 2:
case 3:
case 4:
return action::hit;
case 5:
case 6:
if(can_split && DOUBLE_AFTER_SPLIT) return action::split;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 5:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
if(can_double) return action::double_down;
return action::hit;
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 6:
switch (dealer_card) {
case 2:
if(can_split && DOUBLE_AFTER_SPLIT) return action::split;
return action::hit;
case 3:
case 4:
case 5:
case 6:
if(can_split) return action::split;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 7:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
if(can_split) return action::split;
return action::hit;
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 8:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
if(can_split) return action::split;
return action::stand;
case 7:
case 8:
if(can_split) return action::split;
return action::hit;
case 9:
case 10:
if(can_split) return action::split;
if(can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
case 11:
if(HIT_SOFT_SEVENTEEN && can_surrender && LATE_SURRENDER) return action::surrender;
if(can_split) return action::split;
if(can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
default:
return action::hit;
}
case 9:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
if(can_split) return action::split;
return action::stand;
case 7:
return action::stand;
case 8:
case 9:
if(can_split) return action::split;
return action::stand;
case 10:
case 11:
return action::stand;
default:
return action::stand;
}
case 10:
return action::stand;
case 11:
if(can_split) return action::split;
if(dealer_card == 6 && can_double) return action::double_down;
return action::hit;
default:
return action::hit;
}
} else {
// hard
switch (player_value) {
case 5:
case 6:
case 7:
case 8:
return action::hit;
case 9:
switch (dealer_card) {
case 2:
return action::hit;
case 3:
case 4:
case 5:
case 6:
if(can_double) return action::double_down;
return action::hit;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 10:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
if(can_double) return action::double_down;
return action::hit;
case 10:
return action::hit;
case 11:
return action::hit;
default:
return action::hit;
}
case 11:
if(!HIT_SOFT_SEVENTEEN && dealer_card == 11) return action::hit;
if(can_double) return action::double_down;
return action::hit;
case 12:
switch (dealer_card) {
case 2:
case 3:
return action::hit;
case 4:
case 5:
case 6:
return action::stand;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 13:
case 14:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
return action::stand;
case 7:
case 8:
case 9:
case 10:
case 11:
return action::hit;
default:
return action::hit;
}
case 15:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
return action::stand;
case 7:
case 8:
case 9:
return action::hit;
case 10:
if(can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
case 11:
if(HIT_SOFT_SEVENTEEN && can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
default:
return action::hit;
}
case 16:
switch (dealer_card) {
case 2:
case 3:
case 4:
case 5:
case 6:
if(can_split) return action::split;
return action::stand;
case 7:
case 8:
if(can_split) return action::split;
return action::hit;
case 9:
case 10:
if(can_split) return action::split;
if(can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
case 11:
if(HIT_SOFT_SEVENTEEN && can_surrender && LATE_SURRENDER) return action::surrender;
if(can_split) return action::split;
if(can_surrender && LATE_SURRENDER) return action::surrender;
return action::hit;
default:
return action::hit;
}
case 17:
if(HIT_SOFT_SEVENTEEN && can_surrender && LATE_SURRENDER) return action::surrender;
return action::stand;
case 18:
case 19:
case 20:
case 21:
return action::stand;
default:
return action::hit;
}
}
// should never get here
return action::hit;
}
// TODO: properly comment
action basic_strategy_one_deck(Hand const hand, int const dealer_card) {
return action::hit;
}
// TODO: properly comment
action basic_strategy_two_deck(Hand const hand, int const dealer_card) {
int player_value = hand.get_value();
bool is_soft = hand.get_soft();
bool is_pair = hand.get_pair();
bool can_split = hand.get_can_split();
bool can_double = hand.get_can_double();
// hard
if(player_value == 9 && dealer_card == 2 && can_double) return action::double_down;
if(player_value == 11 && dealer_card == 11 && can_double) return action::double_down;
if(player_value == 11 && dealer_card == 11) return action::hit;
if(player_value == 16 && dealer_card == 9) return action::hit;
// soft
if(is_soft && player_value == 13 && dealer_card == 4 && HIT_SOFT_SEVENTEEN && can_double) return action::double_down;
// pair
if(is_pair && player_value == 12 && dealer_card == 7 && DOUBLE_AFTER_SPLIT && can_split) return action::split;
if(is_pair && player_value == 14 && dealer_card == 8 && DOUBLE_AFTER_SPLIT && can_split) return action::split;
return basic_strategy_general(hand, dealer_card);
}
// TODO: properly comment
action basic_strategy(Hand const hand, int const dealer_card) {
switch (MAX_DECKS) {
case 1:
return basic_strategy_one_deck(hand, dealer_card);
case 2:
return basic_strategy_two_deck(hand, dealer_card);
default:
return basic_strategy_general(hand, dealer_card);
}
}