blackjack-strategy
Version:
provides a suggested action for a player based on Basic Strategy
83 lines (74 loc) • 3.01 kB
JavaScript
/*
* MIT License
* Copyright (c) 2016 Garrett Vargas
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
module.exports = {
// Recommended actions follow Basic Strategy, based on the rules currently in play
EasyBasicStrategy: function(playerCards, dealerCard, handValue, handCount, dealerCheckedBlackjack, options)
{
// Can you split?
if ((playerCards[0] == playerCards[1]) && (playerCards.length == 2) && (handCount < options.maxSplitHands))
{
// Split unless 4s, 5s, and 10s
if ((playerCards[0] != 4) && (playerCards[0] != 5) && (playerCards[0] != 10))
{
return "split";
}
}
// Double
if (((playerCards.length == 2) && ((handCount == 1) || options.doubleAfterSplit)) &&
((handValue.total >= options.doubleRange[0]) && (handValue.total <= options.doubleRange[1])))
{
// Only on 9-11
if ((handValue.total == 9) && (dealerCard < 7) && (dealerCard != 1))
{
return "double";
}
if ((handValue.total == 10) && (dealerCard < 10) && (dealerCard != 1))
{
return "double";
}
if (handValue.total == 11)
{
return "double";
}
}
// Hit and stand
if (handValue.soft)
{
// Hit until you get to 17, 18 against dealer 9-Ace
if ((handValue.total < 18) || ((handValue.total == 18) && ((dealerCard >= 9) || (dealerCard == 1))))
{
return "hit";
}
}
if (handValue.total <= 11)
{
return "hit";
}
else if (handValue.total >= 17)
{
return "stand";
}
else
{
// Hit on 7 or above, else stand
return ((dealerCard >= 7) || (dealerCard == 1)) ? "hit" : "stand";
}
}
};