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double down tweaks

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This commit is contained in:
Nick Pegg 2025-07-05 11:31:27 -07:00
parent 498586344c
commit 83aa05a611
2 changed files with 26 additions and 9 deletions
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5
src/game.rs
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@ -156,6 +156,11 @@ impl Game {
player_hand.push(self.deal()); player_hand.push(self.deal());
} }
PlayerChoice::DoubleDown => { PlayerChoice::DoubleDown => {
if player_hand.cards().len() >= 3 {
// Can only double-down as first move
// TODO: Provide feedback that this move is invalid
continue;
}
if *money_on_table >= bet_amount { if *money_on_table >= bet_amount {
*money_on_table -= bet_amount; *money_on_table -= bet_amount;
bet_amount *= 2; bet_amount *= 2;

30
src/main.rs
View file

@ -115,18 +115,27 @@ fn interactive_decision(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
fn basic_strategy(hand: &Hand, dealer_showing: &Card) -> PlayerChoice { fn basic_strategy(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
// Source: https://en.wikipedia.org/wiki/Blackjack#Basic_strategy // Source: https://en.wikipedia.org/wiki/Blackjack#Basic_strategy
// TODO: Add doubling when it's supported
let dv = u8::from(dealer_showing); let dv = u8::from(dealer_showing);
let can_dd = hand.cards().len() == 2;
if hand.has_ace() && hand.cards().len() == 2 { if hand.has_ace() && hand.cards().len() == 2 {
// Ace and some other card // Ace and some other card
match hand.value() { match hand.value() {
v if v >= 19 => PlayerChoice::Stand, v if v >= 19 => PlayerChoice::Stand,
v if v == 18 && (7..=8).contains(&dv) => PlayerChoice::Stand, v if v == 18 && (7..=8).contains(&dv) => PlayerChoice::Stand,
v if v == 18 && dv < 7 => PlayerChoice::DoubleDown, v if v == 18 && dv < 7 && can_dd => PlayerChoice::DoubleDown,
v if v == 17 && (3..=6).contains(&dv) => PlayerChoice::DoubleDown, v if v == 18 && dv < 7 => PlayerChoice::Stand,
v if (15..=16).contains(&v) && (4..=6).contains(&dv) => PlayerChoice::DoubleDown, v if v == 17 && (3..=6).contains(&dv) && can_dd => PlayerChoice::DoubleDown,
v if (13..=14).contains(&v) && (5..=6).contains(&dv) => PlayerChoice::DoubleDown, v if v == 17 && (3..=6).contains(&dv) => PlayerChoice::Hit,
v if v == 12 && dv == 6 => PlayerChoice::DoubleDown, v if (15..=16).contains(&v) && (4..=6).contains(&dv) && can_dd => {
PlayerChoice::DoubleDown
}
v if (15..=16).contains(&v) && (4..=6).contains(&dv) => PlayerChoice::Hit,
v if (13..=14).contains(&v) && (5..=6).contains(&dv) && can_dd => {
PlayerChoice::DoubleDown
}
v if (13..=14).contains(&v) && (5..=6).contains(&dv) => PlayerChoice::Hit,
v if v == 12 && dv == 6 && can_dd => PlayerChoice::DoubleDown,
v if v == 12 && dv == 6 => PlayerChoice::Hit,
_ => PlayerChoice::Hit, _ => PlayerChoice::Hit,
} }
} else { } else {
@ -134,9 +143,12 @@ fn basic_strategy(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
v if v >= 17 => PlayerChoice::Stand, v if v >= 17 => PlayerChoice::Stand,
v if v > 12 && dv < 7 => PlayerChoice::Stand, v if v > 12 && dv < 7 => PlayerChoice::Stand,
v if v == 12 && (4..=6).contains(&dv) => PlayerChoice::Stand, v if v == 12 && (4..=6).contains(&dv) => PlayerChoice::Stand,
v if v == 11 => PlayerChoice::DoubleDown, v if v == 11 && can_dd => PlayerChoice::DoubleDown,
v if v == 10 && dv < 10 => PlayerChoice::DoubleDown, v if v == 11 => PlayerChoice::Hit,
v if v == 9 && (3..=6).contains(&dv) => PlayerChoice::DoubleDown, v if v == 10 && dv < 10 && can_dd => PlayerChoice::DoubleDown,
v if v == 10 && dv < 10 => PlayerChoice::Hit,
v if v == 9 && (3..=6).contains(&dv) && can_dd => PlayerChoice::DoubleDown,
v if v == 9 && (3..=6).contains(&dv) => PlayerChoice::Hit,
_ => PlayerChoice::Hit, _ => PlayerChoice::Hit,
} }
} }