File size: 48,380 Bytes
1e43f0c |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 |
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Blackjack Probability Calculator</title>
<script src="https://cdn.tailwindcss.com"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<style>
.card {
width: 60px;
height: 90px;
border-radius: 5px;
display: inline-flex;
justify-content: center;
align-items: center;
margin: 0 5px;
font-weight: bold;
box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
/* Card color is purely cosmetic for rank display; not tracking actual suits. */
.card-red {
background: linear-gradient(135deg, #fff, #ffdddd);
color: #d00;
border: 1px solid #d00;
}
.card-black {
background: linear-gradient(135deg, #fff, #eeeeee);
color: #000;
border: 1px solid #000;
}
.progress-bar {
height: 20px;
border-radius: 10px;
overflow: hidden;
background-color: #e5e7eb;
}
.progress-fill {
height: 100%;
transition: width 0.3s ease;
}
.strategy-action {
animation: pulse 2s infinite;
}
@keyframes pulse {
0% { transform: scale(1); }
50% { transform: scale(1.05); }
100% { transform: scale(1); }
}
.tooltip {
position: relative;
display: inline-block;
}
.tooltip .tooltiptext {
visibility: hidden;
width: 200px;
background-color: #333;
color: #fff;
text-align: center;
border-radius: 6px;
padding: 5px;
position: absolute;
z-index: 1;
bottom: 125%;
left: 50%;
margin-left: -100px;
opacity: 0;
transition: opacity 0.3s;
}
.tooltip:hover .tooltiptext {
visibility: visible;
opacity: 1;
}
</style>
</head>
<body class="bg-gray-100 min-h-screen">
<div class="container mx-auto px-4 py-8">
<!-- Header -->
<header class="mb-8 text-center">
<h1 class="text-4xl font-bold text-gray-800 mb-2">
<i class="fas fa-calculator text-blue-600"></i> Blackjack Probability Calculator
</h1>
<p class="text-gray-600 max-w-2xl mx-auto">
Calculate probabilities and optimal strategy for any blackjack situation. Perfect for players who want to make mathematically sound decisions.
</p>
</header>
<!-- Main Calculator -->
<div class="bg-white rounded-xl shadow-lg overflow-hidden mb-8">
<!-- Configuration Section -->
<div class="p-6 border-b border-gray-200">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-cog text-blue-500 mr-2"></i>Game Configuration
</h2>
<div class="grid grid-cols-1 md:grid-cols-3 gap-4">
<div>
<label for="numDecks" class="block text-sm font-medium text-gray-700 mb-1">Number of Decks (1-8)</label>
<div class="flex items-center">
<input type="number" id="numDecks" min="1" max="8" value="1"
class="w-20 px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500">
</div>
</div>
<div class="flex items-center pt-5">
<input type="checkbox" id="h17Rule" checked class="h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded">
<label for="h17Rule" class="ml-2 block text-sm text-gray-700">
Dealer Hits on Soft 17 (H17)
</label>
</div>
<div class="flex items-center pt-5">
<input type="checkbox" id="dasRule" checked class="h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded">
<label for="dasRule" class="ml-2 block text-sm text-gray-700">
Double After Split Allowed (DAS)
</label>
</div>
</div>
</div>
<!-- Player's Hand Section -->
<div class="p-6 border-b border-gray-200">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-user text-green-500 mr-2"></i>Player's Hand
</h2>
<div class="mb-4">
<label for="playerCards" class="block text-sm font-medium text-gray-700 mb-1">
Your Cards (comma separated, e.g. A, 10, 3)
</label>
<input type="text" id="playerCards" value="10, 5"
class="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500">
</div>
<div class="flex flex-wrap gap-2" id="playerCardsDisplay">
<!-- Cards will be displayed here -->
</div>
</div>
<!-- Dealer's Up Card Section -->
<div class="p-6">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-user-tie text-red-500 mr-2"></i>Dealer's Up Card
</h2>
<div class="mb-4">
<label for="dealerCard" class="block text-sm font-medium text-gray-700 mb-1">
Dealer's Face-Up Card
</label>
<input type="text" id="dealerCard" value="A"
class="mt-1 block w-20 px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500">
</div>
<div class="flex" id="dealerCardDisplay">
<!-- Dealer card will be displayed here -->
</div>
</div>
</div>
<!-- Strategy Advice -->
<div class="bg-white rounded-xl shadow-lg overflow-hidden mb-8">
<div class="p-6">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-chess-knight text-purple-500 mr-2"></i>Optimal Strategy Advice
</h2>
<div id="strategyResult" class="text-center py-4">
<div class="text-lg font-bold text-blue-600 mb-2">Recommended Action: --</div>
<div class="text-sm text-gray-600">
H: Hit, S: Stand, D: Double (if allowed), P: Split (if allowed)<br>
Note: Strategy for 4-8 decks. D/P generally on first 2 cards. DAS considered.
</div>
</div>
</div>
</div>
<!-- Calculation Buttons -->
<div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-8">
<button id="calcPlayerBtn" class="w-full bg-green-600 hover:bg-green-700 text-white font-bold py-3 px-4 rounded-lg transition duration-200">
<i class="fas fa-user-cog mr-2"></i>Calculate Player Probabilities
</button>
<button id="calcDealerBtn" class="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-3 px-4 rounded-lg transition duration-200">
<i class="fas fa-user-tie mr-2"></i>Calculate Dealer Probabilities
</button>
</div>
<!-- Results Section -->
<div class="grid grid-cols-1 md:grid-cols-2 gap-6">
<!-- Player Results -->
<div class="bg-white rounded-xl shadow-lg overflow-hidden">
<div class="p-6">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-chart-line text-green-500 mr-2"></i>Player Next Card Probabilities
</h2>
<div id="playerResults" class="space-y-4">
<div>
<div class="text-gray-700">Current Hand Value:</div>
<div id="playerHandValue" class="text-2xl font-bold">--</div>
</div>
<div>
<div class="flex justify-between text-sm text-gray-600 mb-1">
<span>Probability of Safe Card (≤21)</span>
<span id="safeProbText">--%</span>
</div>
<div class="progress-bar">
<div id="safeProbBar" class="progress-fill bg-green-500" style="width: 0%"></div>
</div>
</div>
<div>
<div class="flex justify-between text-sm text-gray-600 mb-1">
<span>Probability of Bust Card (>21)</span>
<span id="bustProbText">--%</span>
</div>
<div class="progress-bar">
<div id="bustProbBar" class="progress-fill bg-red-500" style="width: 0%"></div>
</div>
</div>
<div id="playerStatus" class="text-sm italic text-gray-500"></div>
</div>
</div>
</div>
<!-- Dealer Results -->
<div class="bg-white rounded-xl shadow-lg overflow-hidden">
<div class="p-6">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-chart-pie text-red-500 mr-2"></i>Dealer Outcome Probabilities
</h2>
<div id="dealerResults" class="space-y-2">
<div class="bg-gray-50 p-4 rounded-lg h-64 overflow-y-auto">
<div id="dealerResultsText" class="text-sm">
Dealer probabilities will appear here.
</div>
</div>
<div id="dealerStatus" class="text-sm italic text-gray-500"></div>
</div>
</div>
</div>
</div>
<!-- Legend Section -->
<div class="mt-8 bg-white rounded-xl shadow-lg overflow-hidden">
<div class="p-6">
<h2 class="text-xl font-semibold text-gray-800 mb-4">
<i class="fas fa-info-circle text-yellow-500 mr-2"></i>Blackjack Strategy Legend
</h2>
<div class="grid grid-cols-1 md:grid-cols-4 gap-4">
<div class="bg-blue-50 p-4 rounded-lg">
<div class="font-bold text-blue-800 mb-1">H: Hit</div>
<div class="text-sm text-gray-600">Take another card from the dealer</div>
</div>
<div class="bg-green-50 p-4 rounded-lg">
<div class="font-bold text-green-800 mb-1">S: Stand</div>
<div class="text-sm text-gray-600">Keep your current hand and end your turn</div>
</div>
<div class="bg-purple-50 p-4 rounded-lg">
<div class="font-bold text-purple-800 mb-1">D: Double</div>
<div class="text-sm text-gray-600">Double your bet and take exactly one more card</div>
</div>
<div class="bg-yellow-50 p-4 rounded-lg">
<div class="font-bold text-yellow-800 mb-1">P: Split</div>
<div class="text-sm text-gray-600">Split your pair into two separate hands (when allowed)</div>
</div>
</div>
</div>
</div>
</div>
<script>
// Card values and deck logic
const CARD_VALUES = {
'A': 11, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8,
'9': 9, '10': 10, 'J': 10, 'Q': 10, 'K': 10
};
const VALID_CARD_INPUTS = Object.keys(CARD_VALUES);
const DEALER_CARD_MAP = Object.fromEntries(
VALID_CARD_INPUTS.map(k => [k, ['J', 'Q', 'K'].includes(k) ? '10' : k])
);
// Strategy tables (H17 and S17)
const STRATEGY_TABLES = { /* Copied from previous HTML, no change here */
'H17': {
'hard': { 9: {'2':'H', '3':'D', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 10: {'2':'D', '3':'D', '4':'D', '5':'D', '6':'D', '7':'D', '8':'D', '9':'D', '10':'H', 'A':'H'}, 11: {'2':'D', '3':'D', '4':'D', '5':'D', '6':'D', '7':'D', '8':'D', '9':'D', '10':'D', 'A':'H'}, 12: {'2':'H', '3':'H', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 13: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 14: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 15: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 16: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}},
'soft': { 13: {'2':'H', '3':'H', '4':'H', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 14: {'2':'H', '3':'H', '4':'H', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 15: {'2':'H', '3':'H', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 16: {'2':'H', '3':'H', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 17: {'2':'H', '3':'D', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 18: {'2':'S', '3':'D', '4':'D', '5':'D', '6':'D', '7':'S', '8':'S', '9':'H', '10':'H', 'A':'H'}, 19: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'S', '8':'S', '9':'S', '10':'S', 'A':'S'}},
'pairs': {'A': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'P', '9':'P', '10':'P', 'A':'P'}, '10': {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'S', '8':'S', '9':'S', '10':'S', 'A':'S'}, '9': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'S', '8':'P', '9':'P', '10':'S', 'A':'S'}, '8': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'P', '9':'P', '10':'P', 'A':'P'}, '7': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}, '6': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, '5': {}, '4': {'2':'H', '3':'H', '4':'H', '5':'P', '6':'P', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, '3': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}, '2': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}}
},
'S17': {
'hard': { 9: {'2':'H', '3':'D', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 10: {'2':'D', '3':'D', '4':'D', '5':'D', '6':'D', '7':'D', '8':'D', '9':'D', '10':'H', 'A':'H'}, 11: {'2':'D', '3':'D', '4':'D', '5':'D', '6':'D', '7':'D', '8':'D', '9':'D', '10':'D', 'A':'D'}, 12: {'2':'H', '3':'H', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 13: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 14: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 15: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 16: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}},
'soft': { 13: {'2':'H', '3':'H', '4':'H', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 14: {'2':'H', '3':'H', '4':'H', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 15: {'2':'H', '3':'H', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 16: {'2':'H', '3':'H', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 17: {'2':'H', '3':'D', '4':'D', '5':'D', '6':'D', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, 18: {'2':'S', '3':'D', '4':'D', '5':'D', '6':'D', '7':'S', '8':'S', '9':'S', '10':'S', 'A':'S'}, 19: {'2':'S', '3':'S', '4':'S', '5':'S', '6':'D', '7':'S', '8':'S', '9':'S', '10':'S', 'A':'S'}},
'pairs': {'A': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'P', '9':'P', '10':'P', 'A':'P'}, '10': {'2':'S', '3':'S', '4':'S', '5':'S', '6':'S', '7':'S', '8':'S', '9':'S', '10':'S', 'A':'S'}, '9': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'S', '8':'P', '9':'P', '10':'S', 'A':'S'}, '8': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'P', '9':'P', '10':'P', 'A':'P'}, '7': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}, '6': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, '5': {}, '4': {'2':'H', '3':'H', '4':'H', '5':'P', '6':'P', '7':'H', '8':'H', '9':'H', '10':'H', 'A':'H'}, '3': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}, '2': {'2':'P', '3':'P', '4':'P', '5':'P', '6':'P', '7':'P', '8':'H', '9':'H', '10':'H', 'A':'H'}}
}
};
// Complete strategy tables (auto-fill common cases)
const uniqueDealerColumnKeys = [...new Set(Object.values(DEALER_CARD_MAP))].sort();
for (const ruleSet of Object.values(STRATEGY_TABLES)) {
for (let i = 5; i < 9; i++) { // Hard 5-8
if (!ruleSet.hard[i]) ruleSet.hard[i] = {};
uniqueDealerColumnKeys.forEach(k => { if (!ruleSet.hard[i][k]) ruleSet.hard[i][k] = 'H'; });
}
for (let i = 17; i < 22; i++) { // Hard 17-21
if (!ruleSet.hard[i]) ruleSet.hard[i] = {};
uniqueDealerColumnKeys.forEach(k => { if (!ruleSet.hard[i][k]) ruleSet.hard[i][k] = 'S'; });
}
[20, 21].forEach(i => { // Soft 20, 21
if (!ruleSet.soft[i]) ruleSet.soft[i] = {};
uniqueDealerColumnKeys.forEach(k => { if (!ruleSet.soft[i][k]) ruleSet.soft[i][k] = 'S'; });
});
}
// Initialize the UI
document.addEventListener('DOMContentLoaded', function() {
updateCardDisplays();
updateStrategyAdvice(); // Initial strategy update
document.getElementById('playerCards').addEventListener('input', function() {
updateCardDisplays();
updateStrategyAdvice();
});
document.getElementById('dealerCard').addEventListener('input', function() {
updateCardDisplays();
updateStrategyAdvice();
});
document.getElementById('numDecks').addEventListener('change', updateStrategyAdvice);
document.getElementById('h17Rule').addEventListener('change', updateStrategyAdvice);
document.getElementById('dasRule').addEventListener('change', updateStrategyAdvice); // DAS rule listener
document.getElementById('calcPlayerBtn').addEventListener('click', calculatePlayerProbabilities);
document.getElementById('calcDealerBtn').addEventListener('click', calculateDealerProbabilities);
});
// Helper functions
function parsePlayerCards() {
const cardsStr = document.getElementById('playerCards').value.trim();
if (!cardsStr) return { cards: [], error: "Player cards field is empty." };
const playerCardsList = cardsStr.split(',').map(c => c.trim().toUpperCase()).filter(c => c);
if (!playerCardsList.length) {
return { cards: [], error: "Player cards field is empty or invalid." };
}
for (const card of playerCardsList) {
if (!VALID_CARD_INPUTS.includes(card)) {
return { cards: null, error: `Invalid player card: '${card}'. Use A,K,Q,J,10-2.` };
}
}
return { cards: playerCardsList, error: null };
}
function calculateHandValueDetailed(handCardsStrings) {
if (!handCardsStrings || !handCardsStrings.length) {
return { value: 0, isSoft: false, isBlackjack: false };
}
let value = 0;
let numAcesInHand = 0;
for (const cardStr of handCardsStrings) {
const cardVal = CARD_VALUES[cardStr];
if (cardStr === 'A') numAcesInHand++;
value += cardVal;
}
let acesCountedAs11 = numAcesInHand;
while (value > 21 && acesCountedAs11 > 0) {
value -= 10;
acesCountedAs11--;
}
const isBlackjack = (value === 21 && handCardsStrings.length === 2);
const isSoft = (value <= 21 && acesCountedAs11 > 0);
return { value, isSoft, isBlackjack };
}
function createDeck(numDecks = 1) {
const deck = [];
for (let i = 0; i < numDecks; i++) {
for (const cardFace of Object.keys(CARD_VALUES)) {
deck.push(...Array(4).fill(cardFace));
}
}
return deck;
}
function getEffectiveRemainingDeck(playerHandStrings, dealerUpCardString, numDecks) {
const fullDeck = createDeck(numDecks);
const allKnownCards = [];
if (playerHandStrings) allKnownCards.push(...playerHandStrings.map(c => c.toUpperCase()));
if (dealerUpCardString) allKnownCards.push(dealerUpCardString.toUpperCase());
for (const cardStr of allKnownCards) {
if (!VALID_CARD_INPUTS.includes(cardStr)) {
return { deck: null, error: `Invalid card '${cardStr}' in known cards.` };
}
}
const knownCardCounts = allKnownCards.reduce((acc, card) => { acc[card] = (acc[card] || 0) + 1; return acc; }, {});
const fullDeckCounts = fullDeck.reduce((acc, card) => { acc[card] = (acc[card] || 0) + 1; return acc; }, {});
for (const [card, count] of Object.entries(knownCardCounts)) {
if (count > (fullDeckCounts[card] || 0)) {
return { deck: null, error: `Too many '${card}' cards specified (${count}) than available in ${numDecks} deck(s) (${fullDeckCounts[card] || 0}).` };
}
}
const remainingDeck = [...fullDeck];
for (const cardToRemove of allKnownCards) {
const index = remainingDeck.indexOf(cardToRemove);
if (index === -1) return { deck: null, error: `Error removing '${cardToRemove}' from deck. Card count mismatch.` };
remainingDeck.splice(index, 1);
}
return { deck: remainingDeck, error: null };
}
function getOptimalAction(playerHandStrings, dealerUpCardStr, isH17Rule, dasAllowed) { // Added dasAllowed
if (!playerHandStrings || playerHandStrings.length < 2) {
return { action: null, message: "Player hand must have at least 2 cards for strategy." };
}
if (!dealerUpCardStr) {
return { action: null, message: "Dealer up-card is required for strategy." };
}
dealerUpCardStr = dealerUpCardStr.toUpperCase();
if (!VALID_CARD_INPUTS.includes(dealerUpCardStr)) {
return { action: null, message: `Invalid dealer up-card: ${dealerUpCardStr}` };
}
const mappedDealerCard = DEALER_CARD_MAP[dealerUpCardStr] || dealerUpCardStr;
const { value: playerValue, isSoft } = calculateHandValueDetailed(playerHandStrings);
if (playerValue > 21) return { action: 'S', message: "Player busts, stands (no action)." };
if (playerValue === 21) return { action: 'S', message: "Player has 21, stands." };
const ruleType = isH17Rule ? 'H17' : 'S17';
const strategy = STRATEGY_TABLES[ruleType];
let action = null;
const isTwoCardHand = playerHandStrings.length === 2;
if (isTwoCardHand && playerHandStrings[0] === playerHandStrings[1]) {
const pairCardValStr = playerHandStrings[0];
const pairLookupKey = DEALER_CARD_MAP[pairCardValStr] || pairCardValStr;
if (pairLookupKey === '5') { // 5,5 is Hard 10
action = strategy.hard[10]?.[mappedDealerCard];
} else if (strategy.pairs[pairLookupKey] && strategy.pairs[pairLookupKey][mappedDealerCard]) {
action = strategy.pairs[pairLookupKey][mappedDealerCard];
// DAS-dependent strategy adjustment: 4,4 vs 5 or 6
if (pairLookupKey === '4' && (mappedDealerCard === '5' || mappedDealerCard === '6') && action === 'P' && !dasAllowed) {
action = 'H'; // Hit if can't split 4,4 vs 5,6 with DAS
}
// Add other DAS-dependent rules here if needed
}
}
if (action === null && isSoft) {
if (strategy.soft[playerValue] && strategy.soft[playerValue][mappedDealerCard]) {
action = strategy.soft[playerValue][mappedDealerCard];
}
}
if (action === null) { // Hard total or fallback
if (playerValue < 9) action = 'H';
else if (playerValue >= 17) action = 'S';
else if (strategy.hard[playerValue] && strategy.hard[playerValue][mappedDealerCard]) {
action = strategy.hard[playerValue][mappedDealerCard];
}
}
if (action === null) { // Ultimate fallback if table somehow missed a case
action = playerValue < 17 ? 'H' : 'S';
}
// Adjust for >2 cards: D becomes H, P becomes H/S based on value after hit
if (!isTwoCardHand) {
if (action === 'D') {
// More nuanced: Some Doubles (e.g. Soft 18 vs dealer 3-6) become Stand
if (isSoft && playerValue === 18 && ['3','4','5','6'].includes(mappedDealerCard)) {
action = 'S';
} else if (isSoft && playerValue === 19 && ruleType === 'S17' && mappedDealerCard === '6') {
action = 'S';
}
else {
action = 'H';
}
} else if (action === 'P') {
// If split was recommended, but >2 cards, play current hand as non-pair hard/soft total.
if (isSoft) {
const softAction = strategy.soft[playerValue]?.[mappedDealerCard] || 'H';
action = softAction === 'D' ? 'H' : softAction;
} else {
if (playerValue < 9) action = 'H';
else if (playerValue >= 17) action = 'S';
else {
const hardAction = strategy.hard[playerValue]?.[mappedDealerCard] || 'H';
action = hardAction === 'D' ? 'H' : hardAction;
}
}
}
}
const actionMap = { 'H': "Hit", 'S': "Stand", 'D': "Double", 'P': "Split" };
return {
action: actionMap[action] || action,
message: `Optimal action: ${actionMap[action] || 'Unknown'}`
};
}
function calculatePlayerNextCardProbabilities(playerHandStrings, dealerUpCardString, numDecks) {
const { value: currentPlayerValue } = calculateHandValueDetailed(playerHandStrings);
if (currentPlayerValue > 21) {
return { currentValue: currentPlayerValue, probSafe: 0, probBust: 100, error: null };
}
const { deck: remainingDeck, error: deckError } = getEffectiveRemainingDeck(playerHandStrings, dealerUpCardString, numDecks);
if (deckError) {
return { currentValue: currentPlayerValue, probSafe: 0, probBust: 0, error: deckError };
}
if (!remainingDeck || !remainingDeck.length) {
return { currentValue: currentPlayerValue, probSafe: currentPlayerValue <= 21 ? 100 : 0, probBust: currentPlayerValue <= 21 ? 0 : 100, error: "No cards left in deck for player to draw." };
}
let safeOutcomes = 0;
let bustOutcomes = 0;
for (const nextCardCandidate of remainingDeck) {
const tempHand = [...playerHandStrings, nextCardCandidate];
const { value: newValue } = calculateHandValueDetailed(tempHand);
if (newValue <= 21) safeOutcomes++;
else bustOutcomes++;
}
const totalRemainingCards = remainingDeck.length;
const probSafePercent = totalRemainingCards > 0 ? (safeOutcomes / totalRemainingCards) * 100 : 0;
const probBustPercent = totalRemainingCards > 0 ? (bustOutcomes / totalRemainingCards) * 100 : 0;
return { currentValue: currentPlayerValue, probSafe: probSafePercent, probBust: probBustPercent, error: null };
}
const memoDealerDist = {};
function getDealerFinalValueDistribution(currentDealerHandStrings, currentDeckState, hitSoft17) {
const handTuple = [...currentDealerHandStrings].sort().join(',');
const deckCounts = currentDeckState.reduce((acc, card) => { acc[card] = (acc[card] || 0) + 1; return acc; }, {});
const deckCountsTuple = Object.entries(deckCounts).sort().map(([k, v]) => `${k}:${v}`).join('|');
const memoKey = `${handTuple}|${deckCountsTuple}|${hitSoft17}`;
if (memoDealerDist[memoKey]) return memoDealerDist[memoKey];
const { value, isSoft, isBlackjack } = calculateHandValueDetailed(currentDealerHandStrings);
if (isBlackjack) { const result = { 'BJ': 1.0 }; memoDealerDist[memoKey] = result; return result; }
if (value > 21) { const result = { 'Bust': 1.0 }; memoDealerDist[memoKey] = result; return result; }
if (value >= 17) {
if (value === 17 && isSoft && hitSoft17) { /* Continue */ }
else { const result = { [value]: 1.0 }; memoDealerDist[memoKey] = result; return result; }
}
if (!currentDeckState.length) { const result = value <= 21 ? { [value]: 1.0 } : { 'Bust': 1.0 }; memoDealerDist[memoKey] = result; return result; }
const finalDistribution = {};
const totalCardsInDeck = currentDeckState.length;
const uniqueCardsInDeckCounts = currentDeckState.reduce((acc, card) => { acc[card] = (acc[card] || 0) + 1; return acc; }, {});
for (const [cardDrawn, count] of Object.entries(uniqueCardsInDeckCounts)) {
const probDrawingThisCard = count / totalCardsInDeck;
const newHandStrings = [...currentDealerHandStrings, cardDrawn];
const newDeckState = [...currentDeckState]; // Create a copy
const indexToRemove = newDeckState.indexOf(cardDrawn);
if (indexToRemove > -1) newDeckState.splice(indexToRemove, 1); // Remove one instance
const recursiveDistribution = getDealerFinalValueDistribution(newHandStrings, newDeckState, hitSoft17);
for (const [outcome, prob] of Object.entries(recursiveDistribution)) {
finalDistribution[outcome] = (finalDistribution[outcome] || 0) + probDrawingThisCard * prob;
}
}
memoDealerDist[memoKey] = finalDistribution;
return finalDistribution;
}
function calculateDealerOutcomeProbabilities(dealerUpCardString, playerHandStrings, numDecks, hitSoft17) {
Object.keys(memoDealerDist).forEach(key => delete memoDealerDist[key]);
if (!dealerUpCardString) return { probabilities: null, error: "Dealer up-card must be provided." };
dealerUpCardString = dealerUpCardString.toUpperCase();
if (!VALID_CARD_INPUTS.includes(dealerUpCardString)) return { probabilities: null, error: `Invalid dealer up-card: ${dealerUpCardString}` };
const { deck: deckForHoleCard, error: deckError } = getEffectiveRemainingDeck(playerHandStrings, dealerUpCardString, numDecks);
if (deckError) return { probabilities: null, error: deckError };
if (!deckForHoleCard || !deckForHoleCard.length) return { probabilities: null, error: "No cards left in deck for dealer's hole card." };
const overallDealerOutcomeDistribution = {};
const totalPossibleHoleCards = deckForHoleCard.length;
const holeCardCounts = deckForHoleCard.reduce((acc, card) => { acc[card] = (acc[card] || 0) + 1; return acc; }, {});
for (const [holeCardCandidate, count] of Object.entries(holeCardCounts)) {
const probThisHoleCardIsDrawn = count / totalPossibleHoleCards;
const dealerInitialHand = [dealerUpCardString, holeCardCandidate];
const deckForDealerPlay = [...deckForHoleCard]; // Create a copy
const indexToRemove = deckForDealerPlay.indexOf(holeCardCandidate);
if (indexToRemove > -1) deckForDealerPlay.splice(indexToRemove, 1); // Remove one instance
const distributionForThisHoleCard = getDealerFinalValueDistribution(dealerInitialHand, deckForDealerPlay, hitSoft17);
for (const [outcome, prob] of Object.entries(distributionForThisHoleCard)) {
overallDealerOutcomeDistribution[outcome] = (overallDealerOutcomeDistribution[outcome] || 0) + probThisHoleCardIsDrawn * prob;
}
}
const finalProbabilitiesPercent = Object.fromEntries(Object.entries(overallDealerOutcomeDistribution).map(([k, v]) => [k, v * 100]));
return { probabilities: finalProbabilitiesPercent, error: null };
}
// UI Update Functions
function updateCardDisplays() {
const { cards: playerCards } = parsePlayerCards();
const dealerCard = document.getElementById('dealerCard').value.trim().toUpperCase();
const playerCardsDisplay = document.getElementById('playerCardsDisplay');
playerCardsDisplay.innerHTML = '';
if (playerCards && playerCards.length) {
playerCards.forEach(card => {
// Simplified red/black for display, not true suit tracking.
const isRedSuitChar = ['H', 'D'].includes(card.slice(-1)) && card.length > 1; // Avoids 'H' from 'HIT'
const cardEl = document.createElement('div');
cardEl.className = `card ${isRedSuitChar ? 'card-red' : 'card-black'}`;
cardEl.textContent = card;
playerCardsDisplay.appendChild(cardEl);
});
}
const dealerCardDisplay = document.getElementById('dealerCardDisplay');
dealerCardDisplay.innerHTML = '';
if (dealerCard && VALID_CARD_INPUTS.includes(dealerCard)) {
const isRedSuitChar = ['H', 'D'].includes(dealerCard.slice(-1)) && dealerCard.length > 1;
const cardEl = document.createElement('div');
cardEl.className = `card ${isRedSuitChar ? 'card-red' : 'card-black'}`;
cardEl.textContent = dealerCard;
dealerCardDisplay.appendChild(cardEl);
const faceDownCard = document.createElement('div');
faceDownCard.className = 'card bg-gray-800 text-white';
faceDownCard.innerHTML = '<i class="fas fa-question"></i>';
dealerCardDisplay.appendChild(faceDownCard);
}
}
function updateStrategyAdvice() {
const { cards: playerCards, error: playerError } = parsePlayerCards();
const dealerCard = document.getElementById('dealerCard').value.trim().toUpperCase();
const isH17 = document.getElementById('h17Rule').checked;
const dasAllowed = document.getElementById('dasRule').checked; // Get DAS rule
const strategyResultDiv = document.getElementById('strategyResult');
if (playerError && playerCards === null) {
strategyResultDiv.innerHTML = `<div class="text-red-500">${playerError}</div>`; return;
}
if (!playerCards || !playerCards.length || !dealerCard) {
strategyResultDiv.innerHTML = '<div class="text-lg font-bold text-blue-600 mb-2">Recommended Action: --</div><div class="text-sm text-gray-500">Need player & dealer cards.</div>'; return;
}
if (!VALID_CARD_INPUTS.includes(dealerCard)) {
strategyResultDiv.innerHTML = `<div class="text-red-500">Invalid dealer card '${dealerCard}'</div>`; return;
}
if (playerCards.length < 2) {
strategyResultDiv.innerHTML = '<div class="text-lg font-bold text-blue-600 mb-2">Recommended Action: --</div><div class="text-sm text-gray-500">Need at least 2 player cards.</div>'; return;
}
const { action, message } = getOptimalAction(playerCards, dealerCard, isH17, dasAllowed); // Pass dasAllowed
if (action) {
let actionClass = 'text-blue-600'; // Default for Stand
if (action === 'Hit') actionClass = 'text-green-600';
else if (action === 'Double') actionClass = 'text-purple-600';
else if (action === 'Split') actionClass = 'text-yellow-600';
strategyResultDiv.innerHTML = `
<div class="text-lg font-bold ${actionClass} mb-2 strategy-action">Recommended Action: ${action}</div>
<div class="text-sm text-gray-600">${message}</div>
`;
} else {
strategyResultDiv.innerHTML = `<div class="text-gray-500">${message || 'Could not determine action.'}</div>`;
}
}
function calculatePlayerProbabilities() {
const playerStatus = document.getElementById('playerStatus');
playerStatus.textContent = '';
updateStrategyAdvice();
const { cards: playerCards, error } = parsePlayerCards();
const playerHandValueEl = document.getElementById('playerHandValue');
const safeProbTextEl = document.getElementById('safeProbText');
const bustProbTextEl = document.getElementById('bustProbText');
const safeProbBarEl = document.getElementById('safeProbBar');
const bustProbBarEl = document.getElementById('bustProbBar');
function resetPlayerProbs() {
playerHandValueEl.textContent = '--';
safeProbTextEl.textContent = '--%';
bustProbTextEl.textContent = '--%';
safeProbBarEl.style.width = '0%';
bustProbBarEl.style.width = '0%';
}
if (error && playerCards === null) {
playerStatus.textContent = error; resetPlayerProbs(); return;
}
if (!playerCards || !playerCards.length) {
playerStatus.textContent = "Player cards are empty for probability calculation."; resetPlayerProbs(); return;
}
const numDecks = parseInt(document.getElementById('numDecks').value);
const dealerUpCard = document.getElementById('dealerCard').value.trim().toUpperCase();
let effectiveDealerCard = null;
if (dealerUpCard && VALID_CARD_INPUTS.includes(dealerUpCard)) effectiveDealerCard = dealerUpCard;
else if (dealerUpCard) playerStatus.textContent = `Warning: Invalid dealer up-card '${dealerUpCard}'. Ignored for card removal in player prob calc.`;
const { currentValue, probSafe, probBust, error: calcError } = calculatePlayerNextCardProbabilities(playerCards, effectiveDealerCard, numDecks);
if (calcError) {
const currentStatus = playerStatus.textContent;
playerStatus.textContent = `${currentStatus} Error: ${calcError}`.trim(); resetPlayerProbs();
} else {
playerHandValueEl.textContent = currentValue;
safeProbTextEl.textContent = `${probSafe.toFixed(2)}%`;
bustProbTextEl.textContent = `${probBust.toFixed(2)}%`;
safeProbBarEl.style.width = `${probSafe}%`;
bustProbBarEl.style.width = `${probBust}%`;
const currentStatus = playerStatus.textContent;
const calcMessage = currentValue > 21 ? "Player is Busted." : "Player probabilities calculated.";
playerStatus.textContent = currentStatus.includes("Warning") ? `${currentStatus} ${calcMessage}` : calcMessage;
}
}
function calculateDealerProbabilities() {
const dealerStatus = document.getElementById('dealerStatus');
dealerStatus.textContent = '';
updateStrategyAdvice();
const { cards: playerCards, error: playerError } = parsePlayerCards();
if (playerError && playerCards === null) { dealerStatus.textContent = `Player card error: ${playerError}`; return; }
const numDecks = parseInt(document.getElementById('numDecks').value);
const dealerUpCard = document.getElementById('dealerCard').value.trim().toUpperCase();
const hitSoft17 = document.getElementById('h17Rule').checked;
if (!dealerUpCard) { dealerStatus.textContent = "Dealer up-card is required for dealer calculation."; return; }
if (!VALID_CARD_INPUTS.includes(dealerUpCard)) { dealerStatus.textContent = `Invalid dealer up-card: '${dealerUpCard}'.`; return; }
dealerStatus.textContent = "Calculating dealer probabilities... Please wait.";
setTimeout(() => {
const { probabilities, error } = calculateDealerOutcomeProbabilities(dealerUpCard, playerCards || [], numDecks, hitSoft17);
const dealerResultsTextEl = document.getElementById('dealerResultsText');
dealerResultsTextEl.innerHTML = '';
if (error) {
dealerStatus.textContent = error;
dealerResultsTextEl.innerHTML = "Error during calculation.";
} else if (probabilities) {
dealerStatus.textContent = "Dealer probabilities calculated.";
// Expanded display order
const displayOrder = ['BJ', 21, 20, 19, 18, 17, 16, 15, 'Bust'];
let outputHTML = "<div class='space-y-1'><div class='font-bold mb-2'>Dealer Final Hand Probabilities:</div>";
const processedOutcomes = new Set();
for (const outcomeKey of displayOrder) {
if (probabilities[outcomeKey] !== undefined) {
const displayKeyStr = outcomeKey === 'BJ' ? "Blackjack" : outcomeKey.toString();
const probVal = probabilities[outcomeKey];
outputHTML += `<div class="flex justify-between"><span>P(Dealer gets ${displayKeyStr}):</span><span class="font-bold">${probVal.toFixed(2)}%</span></div>`;
processedOutcomes.add(outcomeKey);
}
}
const remainingItems = [];
for (const key in probabilities) {
if (!processedOutcomes.has(key) && !processedOutcomes.has(parseInt(key))) { // Check both string and int versions for safety
remainingItems.push([key, probabilities[key]]);
}
}
// Sort remaining: Numbers desc (except Bust/BJ), then BJ, then Bust
remainingItems.sort((a, b) => {
const keyA = a[0]; const keyB = b[0];
const isNumA = !isNaN(parseFloat(keyA)); const isNumB = !isNaN(parseFloat(keyB));
if (keyA === 'BJ') return -1; if (keyB === 'BJ') return 1;
if (keyA === 'Bust') return 1; if (keyB === 'Bust') return -1;
if (isNumA && isNumB) return parseFloat(keyB) - parseFloat(keyA); // Numbers descending
if (isNumA) return -1; // Numbers before other strings
if (isNumB) return 1;
return keyA.localeCompare(keyB); // Other strings alphabetically
});
for (const [outcomeKey, probVal] of remainingItems) {
const displayKeyStr = outcomeKey === 'BJ' ? "Blackjack" : outcomeKey.toString();
outputHTML += `<div class="flex justify-between"><span>P(Dealer gets ${displayKeyStr}):</span><span class="font-bold">${probVal.toFixed(2)}%</span></div>`;
}
const totalProbCheck = Object.values(probabilities).reduce((sum, val) => sum + val, 0);
outputHTML += `<div class="mt-2 pt-2 border-t border-gray-200 text-sm"><div class="flex justify-between"><span>Total Probability Sum:</span><span class="font-bold">${totalProbCheck.toFixed(2)}%</span></div><div class="text-xs text-gray-500">(should be close to 100%)</div></div>`;
outputHTML += "</div>";
dealerResultsTextEl.innerHTML = outputHTML;
} else {
dealerStatus.textContent = "No results from dealer calculation.";
dealerResultsTextEl.innerHTML = "No results.";
}
}, 50); // Reduced timeout slightly, 100ms is quite long for simple UI update.
}
</script>
<p style="border-radius: 8px; text-align: center; font-size: 12px; color: #fff; margin-top: 16px;position: fixed; left: 8px; bottom: 8px; z-index: 10; background: rgba(0, 0, 0, 0.8); padding: 4px 8px;">Made with <img src="https://enzostvs-deepsite.hf.space/logo.svg" alt="DeepSite Logo" style="width: 16px; height: 16px; vertical-align: middle;display:inline-block;margin-right:3px;filter:brightness(0) invert(1);"><a href="https://enzostvs-deepsite.hf.space" style="color: #fff;text-decoration: underline;" target="_blank" >DeepSite</a> - 🧬 <a href="https://enzostvs-deepsite.hf.space?remix=LMLK/blackjack-probability-calculator" style="color: #fff;text-decoration: underline;" target="_blank" >Remix</a></p></body>
</html> |