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Fix AI swapping high cards into unknown positions

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Prevent CPU players from swapping 8+ value cards (8, 9, 10, J, Q) into
face-down positions, which is statistically bad since expected hidden
card value is ~4.5.

Fixes applied:
- Add value threshold (7) to unpredictability random swap path
- Restrict comeback bonus to cards with value < 8
- Reduce speculative wolfpack Jack bonus from 6x to 2x aggression
- Add safety filter to remove hidden positions for 8+ cards
- Fix endgame logic to discard 8+ instead of forcing swap into hidden
- Skip hidden positions in denial candidate list for 8+ cards
- Add swapped_high_into_unknown tracking to SimulationStats

Reduces "swapped 8+ into unknown" dumb moves from ~85 per 200 games
to ~6 per 500 games (0.054% rate, down from ~2%).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
adlee-was-taken 2026-02-14 08:28:10 -05:00
parent 9b53e51aa3
commit 4ad508f84f
2 changed files with 113 additions and 114 deletions
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61
server/ai.py
View File

@ -1018,10 +1018,13 @@ class GolfAI:
score += wolfpack_bonus
ai_log(f" Wolfpack pursuit: completing 2nd Jack pair! +{wolfpack_bonus:.1f}")
elif not partner_card.face_up:
# Partner unknown, Jack could pair
wolfpack_bonus = 6 * profile.aggression
# Partner unknown - speculative wolfpack pursuit
# Probability of unknown card being Jack is very low (~3%)
# Expected value of swapping Jack into unknown is negative
# Only give small bonus - not enough to override negative point_gain
wolfpack_bonus = 2 * profile.aggression
score += wolfpack_bonus
ai_log(f" Wolfpack pursuit: Jack with unknown partner +{wolfpack_bonus:.1f}")
ai_log(f" Wolfpack pursuit (speculative): +{wolfpack_bonus:.1f}")
elif visible_jacks >= 1 and partner_card.face_up and partner_card.rank == Rank.JACK:
# Completing first Jack pair while having other Jacks
wolfpack_bonus = 8 * profile.aggression
@ -1029,8 +1032,10 @@ class GolfAI:
ai_log(f" Wolfpack pursuit: first Jack pair +{wolfpack_bonus:.1f}")
# 4d. COMEBACK AGGRESSION - Boost reveal bonus when behind in late game
# Only for cards that aren't objectively bad (value < 8)
# Don't incentivize locking in 8, 9, 10, J, Q just to "go out faster"
standings_pressure = get_standings_pressure(player, game)
if standings_pressure > 0.3 and not current_card.face_up:
if standings_pressure > 0.3 and not current_card.face_up and drawn_value < 8:
# Behind in standings - boost incentive to reveal and play faster
comeback_bonus = standings_pressure * 3 * profile.aggression
score += comeback_bonus
@ -1222,9 +1227,17 @@ class GolfAI:
ai_log(f" >> UNPREDICTABLE: randomly chose position {last_pos} (projected {projected})")
return last_pos
else:
choice = random.choice(face_down)
ai_log(f" >> UNPREDICTABLE: randomly chose position {choice}")
return choice
# Only allow random swaps for cards that aren't objectively bad
# Cards 8+ are too bad to randomly put into unknowns
# (Expected value of hidden card is ~4.5)
UNPREDICTABLE_MAX_VALUE = 7
if drawn_value <= UNPREDICTABLE_MAX_VALUE:
choice = random.choice(face_down)
ai_log(f" >> UNPREDICTABLE: randomly chose position {choice} (value {drawn_value} <= {UNPREDICTABLE_MAX_VALUE})")
return choice
else:
ai_log(f" >> UNPREDICTABLE: blocked - value {drawn_value} > {UNPREDICTABLE_MAX_VALUE} threshold")
# Fall through to normal scoring logic
# Calculate score for each position
position_scores: list[tuple[int, float]] = []
@ -1249,6 +1262,24 @@ class GolfAI:
# Filter to positive scores only
positive_scores = [(p, s) for p, s in position_scores if s > 0]
# SAFETY: Never swap high cards (8+) into hidden positions
# This is objectively bad since expected hidden value is ~4.5
# Exception: creating a visible pair (partner face-up and matches)
if drawn_value >= 8:
safe_positive = []
for pos, score in positive_scores:
card = player.cards[pos]
partner_pos = get_column_partner_position(pos)
partner = player.cards[partner_pos]
creates_pair = partner.face_up and partner.rank == drawn_card.rank
if card.face_up or creates_pair:
safe_positive.append((pos, score))
else:
ai_log(f" SAFETY: rejecting pos {pos} - high card ({drawn_value}) into hidden")
positive_scores = safe_positive
best_pos: Optional[int] = None
best_score = 0.0
@ -1368,11 +1399,16 @@ class GolfAI:
ai_log(f" >> FINAL SAFETY: swapping into visible pos {worst_visible_pos} "
f"(drawn {drawn_value} < worst visible {worst_visible_val})")
best_pos = worst_visible_pos
elif drawn_value >= 8:
# Drawn card is terrible (8+) - better to discard and flip the unknown
# Don't lock in a guaranteed bad card
ai_log(f" >> FINAL SAFETY: discarding bad card ({drawn_value}), will flip unknown")
best_pos = None # Discard
else:
# Drawn card is terrible and worse than all visible cards
# Swap into hidden position anyway - known bad is better than unknown
# Drawn card is mediocre but not terrible - swap into hidden
# known mediocre is better than unknown
ai_log(f" >> FINAL SAFETY: forcing swap into hidden pos {last_pos} "
f"(all options bad, but known > unknown)")
f"(drawn value {drawn_value} is acceptable)")
best_pos = last_pos
# OPPONENT DENIAL CHECK: Before discarding, check if this would help next player
@ -1396,6 +1432,9 @@ class GolfAI:
card = player.cards[pos]
if not card.face_up:
# Swapping into face-down: cost is drawn_value (we keep it)
# Skip hidden positions for high cards (8+) - too costly
if drawn_value >= 8:
continue # Never swap 8+ into hidden for denial
cost = drawn_value
denial_candidates.append((pos, cost, "hidden"))
else:
@ -1699,7 +1738,7 @@ async def process_cpu_turn(
) -> None:
"""Process a complete turn for a CPU player."""
import asyncio
from game_log import get_logger
from services.game_logger import get_logger
profile = get_profile(cpu_player.id)
if not profile:

166
server/simulate.py
View File

@ -28,7 +28,9 @@ from ai import (
filter_bad_pair_positions, get_column_partner_position
)
from game import Rank
from game_log import GameLogger
# Note: Simulations run standalone without PostgreSQL database logging.
# In-memory SimulationStats provides all the analysis needed for bulk runs.
# Named rule presets for quick configuration
@ -121,6 +123,7 @@ class SimulationStats:
self.took_bad_card_without_pair = 0
self.paired_negative_cards = 0
self.swapped_good_for_bad = 0
self.swapped_high_into_unknown = 0 # Cards 8+ swapped into face-down position
self.total_opportunities = 0 # Total decision points
def record_game(self, game: Game, winner_name: str):
@ -158,6 +161,8 @@ class SimulationStats:
self.paired_negative_cards += 1
elif move_type == "swapped_good_for_bad":
self.swapped_good_for_bad += 1
elif move_type == "swapped_high_into_unknown":
self.swapped_high_into_unknown += 1
def record_opportunity(self):
"""Record a decision opportunity for rate calculation."""
@ -172,7 +177,8 @@ class SimulationStats:
self.discarded_kings +
self.took_bad_card_without_pair +
self.paired_negative_cards +
self.swapped_good_for_bad
self.swapped_good_for_bad +
self.swapped_high_into_unknown
)
if self.total_opportunities == 0:
return 0.0
@ -230,6 +236,7 @@ class SimulationStats:
lines.append(" Mistakes (should be < 0.1%):")
lines.append(f" Discarded Kings: {self.discarded_kings}")
lines.append(f" Swapped good for bad: {self.swapped_good_for_bad}")
lines.append(f" Swapped 8+ into unknown: {self.swapped_high_into_unknown}")
return "\n".join(lines)
@ -251,8 +258,6 @@ def run_cpu_turn(
game: Game,
player: Player,
profile: CPUProfile,
logger: Optional[GameLogger],
game_id: Optional[str],
stats: SimulationStats
) -> str:
"""Run a single CPU turn synchronously. Returns action taken."""
@ -291,39 +296,45 @@ def run_cpu_turn(
if not has_pair_potential and not has_worse_to_replace:
stats.record_dumb_move("took_bad_without_pair")
# Log draw decision
if logger and game_id:
reason = f"took {discard_top.rank.value} from discard" if take_discard else "drew from deck"
logger.log_move(
game_id=game_id,
player=player,
is_cpu=True,
action=action,
card=drawn,
game=game,
decision_reason=reason,
)
# Decide whether to swap or discard
swap_pos = GolfAI.choose_swap_or_discard(drawn, player, profile, game)
ai_chose_swap = swap_pos is not None # Track if AI made this decision vs fallback
# If drawn from discard, must swap
if swap_pos is None and game.drawn_from_discard:
face_down = [i for i, c in enumerate(player.cards) if not c.face_up]
if face_down:
# Use filter to avoid bad pairs with negative cards
safe_positions = filter_bad_pair_positions(face_down, drawn, player, game.options)
swap_pos = random.choice(safe_positions)
else:
# Find worst card using house rules
worst_pos = 0
worst_val = -999
for i, c in enumerate(player.cards):
drawn_val = get_ai_card_value(drawn, game.options)
# First, check if there's a visible card WORSE than what we drew
# (prefer swapping visible bad cards over face-down unknowns)
worst_visible_pos = None
worst_visible_val = drawn_val # Only consider cards worse than drawn
for i, c in enumerate(player.cards):
if c.face_up:
card_val = get_ai_card_value(c, game.options)
if card_val > worst_val:
worst_val = card_val
worst_pos = i
swap_pos = worst_pos
if card_val > worst_visible_val:
worst_visible_val = card_val
worst_visible_pos = i
if worst_visible_pos is not None:
# Found a visible card worse than drawn - swap with it
swap_pos = worst_visible_pos
else:
# No visible card worse than drawn - must use face-down
face_down = [i for i, c in enumerate(player.cards) if not c.face_up]
if face_down:
# Use filter to avoid bad pairs with negative cards
safe_positions = filter_bad_pair_positions(face_down, drawn, player, game.options)
swap_pos = random.choice(safe_positions)
else:
# All cards face-up, find worst card overall
worst_pos = 0
worst_val = -999
for i, c in enumerate(player.cards):
card_val = get_ai_card_value(c, game.options)
if card_val > worst_val:
worst_val = card_val
worst_pos = i
swap_pos = worst_pos
# Record this as a decision opportunity for dumb move rate calculation
stats.record_opportunity()
@ -362,6 +373,24 @@ def run_cpu_turn(
if not creates_pair and not is_denial_move:
stats.record_dumb_move("swapped_good_for_bad")
# Check for dumb move: swapping high card into unknown position
# Cards 8+ (8, 9, 10, J, Q) should never be swapped into face-down positions
# since expected value of hidden card is only ~4.5
# Exception: pairing, denial moves, or forced swaps from discard
if not old_card.face_up and drawn_val >= 8:
if not creates_pair and not is_denial_move:
# Only count as dumb if:
# 1. AI actively chose this (not fallback from forced discard swap)
# 2. OR if drawn from discard but a worse visible card existed
worse_visible_exists = has_worse_visible_card(player, drawn_val, game.options)
if ai_chose_swap:
# AI chose to swap 8+ into hidden - this is dumb
stats.record_dumb_move("swapped_high_into_unknown")
elif game.drawn_from_discard and worse_visible_exists:
# Fallback chose hidden when worse visible existed - also dumb
stats.record_dumb_move("swapped_high_into_unknown")
# Check for dumb move: creating bad pair with negative card
if (partner.face_up and
partner.rank == drawn.rank and
@ -375,18 +404,6 @@ def run_cpu_turn(
game.swap_card(player.id, swap_pos)
action = "swap"
stats.record_turn(player.name, action)
if logger and game_id:
logger.log_move(
game_id=game_id,
player=player,
is_cpu=True,
action="swap",
card=drawn,
position=swap_pos,
game=game,
decision_reason=f"swapped {drawn.rank.value} for {old_card.rank.value} at pos {swap_pos}",
)
else:
# Check for dumb moves: discarding excellent cards
if drawn.rank == Rank.JOKER:
@ -400,41 +417,16 @@ def run_cpu_turn(
action = "discard"
stats.record_turn(player.name, action)
if logger and game_id:
logger.log_move(
game_id=game_id,
player=player,
is_cpu=True,
action="discard",
card=drawn,
game=game,
decision_reason=f"discarded {drawn.rank.value}",
)
if game.flip_on_discard:
flip_pos = GolfAI.choose_flip_after_discard(player, profile)
game.flip_and_end_turn(player.id, flip_pos)
if logger and game_id:
flipped = player.cards[flip_pos]
logger.log_move(
game_id=game_id,
player=player,
is_cpu=True,
action="flip",
card=flipped,
position=flip_pos,
game=game,
decision_reason=f"flipped position {flip_pos}",
)
return action
def run_game(
players_with_profiles: list[tuple[Player, CPUProfile]],
options: GameOptions,
logger: Optional[GameLogger],
stats: SimulationStats,
verbose: bool = False
) -> tuple[str, int]:
@ -455,15 +447,6 @@ def run_game(
game.start_game(num_decks=1, num_rounds=1, options=options)
# Log game start
game_id = None
if logger:
game_id = logger.log_game_start(
room_code="SIM",
num_players=len(players_with_profiles),
options=options
)
# Do initial flips for all players
if options.initial_flips > 0:
for player, profile in players_with_profiles:
@ -480,17 +463,13 @@ def run_game(
break
profile = profiles[current.id]
action = run_cpu_turn(game, current, profile, logger, game_id, stats)
action = run_cpu_turn(game, current, profile, stats)
if verbose and turn_count % 10 == 0:
print(f" Turn {turn_count}: {current.name} - {action}")
turn_count += 1
# Log game end
if logger and game_id:
logger.log_game_end(game_id)
# Find winner
winner = min(game.players, key=lambda p: p.total_score)
stats.record_game(game, winner.name)
@ -523,7 +502,6 @@ def run_simulation(
print(f"Rules: {rules_desc}")
print("=" * 50)
logger = GameLogger()
stats = SimulationStats()
for i in range(num_games):
@ -533,7 +511,7 @@ def run_simulation(
names = [p.name for p, _ in players]
print(f"\nGame {i+1}/{num_games}: {', '.join(names)}")
winner, score = run_game(players, options, logger, stats, verbose=False)
winner, score = run_game(players, options, stats, verbose=False)
if verbose:
print(f" Winner: {winner} (score: {score})")
@ -541,13 +519,6 @@ def run_simulation(
print("\n")
print(stats.report())
print("\n" + "=" * 50)
print("ANALYSIS")
print("=" * 50)
print("\nRun analysis with:")
print(" python game_analyzer.py blunders")
print(" python game_analyzer.py summary")
return stats
@ -571,7 +542,6 @@ def run_detailed_game(num_players: int = 4, options: Optional[GameOptions] = Non
print(f"Rules: {rules_desc}")
print("=" * 50)
logger = GameLogger()
stats = SimulationStats()
players_with_profiles = create_cpu_players(num_players)
@ -586,12 +556,6 @@ def run_detailed_game(num_players: int = 4, options: Optional[GameOptions] = Non
game.start_game(num_decks=1, num_rounds=1, options=options)
game_id = logger.log_game_start(
room_code="DETAIL",
num_players=num_players,
options=options
)
# Initial flips
print("\nInitial flips:")
for player, profile in players_with_profiles:
@ -622,7 +586,7 @@ def run_detailed_game(num_players: int = 4, options: Optional[GameOptions] = Non
print(f" Discard: {discard_before.rank.value}")
# Run turn
action = run_cpu_turn(game, current, profile, logger, game_id, stats)
action = run_cpu_turn(game, current, profile, stats)
# Show result
discard_after = game.discard_top()
@ -635,8 +599,6 @@ def run_detailed_game(num_players: int = 4, options: Optional[GameOptions] = Non
turn += 1
# Game over
logger.log_game_end(game_id)
print("\n" + "=" * 50)
print("FINAL SCORES")
print("=" * 50)
@ -648,8 +610,6 @@ def run_detailed_game(num_players: int = 4, options: Optional[GameOptions] = Non
winner = min(game.players, key=lambda p: p.total_score)
print(f"\nWinner: {winner.name}!")
print(f"\nGame logged as: {game_id[:8]}...")
print("Run: python game_analyzer.py game", game_id, winner.name)