In Chicken Cross, each game outcome is generated transparently using a combination of a server seed, a client seed, and a nonce.<pre data-language="plain">import { createHmac } from 'crypto';
import Decimal from 'decimal.js';

interface ChickenCrossSegment {
 maxRounds: number;
 roundMultiplier: (round: number) =&gt; number;
}
const CHICKEN_CROSS_HOUSE_EDGE = 4;
const CHICKEN_CROSS_MAX_ROUNDS = 25;
const ChickenCrossDifficulty = {
 Easy: 'easy',
 Medium: 'medium',
 Hard: 'hard',
 Expert: 'expert',
} as const;
export type ChickenCrossDifficulty =
 (typeof ChickenCrossDifficulty)[keyof typeof ChickenCrossDifficulty];
function* getBytesChunks(
 serverSeed: string,
 clientSeed: string,
 nonce: number | string
): Generator&lt;number[]&gt; {
 let step = 0;
 let counter = 0;
 while (true) {
 const hmac = createHmac('sha512', serverSeed);
 hmac.update(<code>${clientSeed}:${nonce}:${step}</code>);
 const hashValue = hmac.digest('hex');
<pre><code>while (counter &amp;lt; 16) {
 const hashBytes: number[] = [];

 for (let i = 0; i &amp;lt; 4; i++) {
 hashBytes.push(
 parseInt(
 hashValue.substring(i * 2 + counter * 8, i * 2 + 2 + counter * 8),
 16
 )
 );
 }

 yield hashBytes;
 counter += 1;
}

counter = 0;
step += 1;
</code></pre>
 }
}
const getFloats = (
 serverSeed: string,
 clientSeed: string,
 nonce: number | string,
 count: number
) =&gt; {
 const bytes = getBytesChunks(serverSeed, clientSeed, nonce);
 const ints: number[][] = [];
 while (ints.length &lt; count) {
 const nextValue = bytes.next().value;
 if (nextValue) {
 ints.push(nextValue);
 }
 }
 return ints.map((bytesArray) =&gt;
 bytesArray.reduce((acc, value, i) =&gt; acc + value / 256 ** (i + 1), 0)
 );
}
const getFairValue = ({
 clientSeed,
 serverSeed,
 nonceUsed,
 round,
}: {
 clientSeed: string;
 serverSeed: string;
 nonceUsed: number;
 round: number | string;
}) =&gt; {
 const floats = getFloats(serverSeed, clientSeed, <code>${nonceUsed}:${round}</code>, 1);
 const fairValue = floats[0];
 if (fairValue == null) {
 throw new Error('Failed to generate provably fair value');
 }
 return fairValue;
};
const multiplierFormula = (options: {
 difficultyFactor: number;
 round: number;
}) =&gt; {
 let multiplier = new Decimal(1);
 const difficultyFactor = Decimal(
 CHICKEN_CROSS_MAX_ROUNDS - options.difficultyFactor
 );
 for (let roundIndex = 0; roundIndex &lt; options.round; roundIndex++) {
 multiplier = multiplier.mul(
 difficultyFactor
 .minus(roundIndex)
 .dividedBy(CHICKEN_CROSS_MAX_ROUNDS - roundIndex)
 );
 }
 const chancePercent = multiplier.mul(100);
 const finalMultiplier = new Decimal(100)
 .minus(CHICKEN_CROSS_HOUSE_EDGE)
 .dividedBy(chancePercent);
 return finalMultiplier
 .toDecimalPlaces(2, Decimal.ROUND_HALF_UP)
 .toNumber();
};
const CHICKEN_CROSS_CONFIGS: Record&lt;
 ChickenCrossDifficulty,
 ChickenCrossSegment
&gt; = {
 [ChickenCrossDifficulty.Easy]: {
 get maxRounds() {
 return 24;
 },
 roundMultiplier(round: number) {
 return multiplierFormula({
 round,
 difficultyFactor: 1,
 });
 },
 },
 [ChickenCrossDifficulty.Medium]: {
 get maxRounds() {
 return 22;
 },
 roundMultiplier(round: number) {
 return multiplierFormula({
 round,
 difficultyFactor: 3,
 });
 },
 },
 [ChickenCrossDifficulty.Hard]: {
 get maxRounds() {
 return 20;
 },
 roundMultiplier(round: number) {
 return multiplierFormula({
 round,
 difficultyFactor: 5,
 });
 },
 },
 [ChickenCrossDifficulty.Expert]: {
 get maxRounds() {
 return 15;
 },
 roundMultiplier(round: number) {
 return multiplierFormula({
 round,
 difficultyFactor: 10,
 });
 },
 },
};
const determineMultiplierWinPercentage = (options: {
 fairValue: number;
 difficulty: ChickenCrossDifficulty;
 round: number;
 }) =&gt; {
 const config = CHICKEN_CROSS_CONFIGS[options.difficulty];
 const multiplier = config.roundMultiplier(options.round);
 const winPercentage = (100 - CHICKEN_CROSS_HOUSE_EDGE) / multiplier;
 // Scale the fair value (0-0.999...) to the total weight range
 const targetPercentage = options.fairValue * 100;
 if (targetPercentage &gt;= winPercentage) {
 return 0
 }
 return multiplier;
}
const USER_INPUT_SERVER_SEED = 'SERVER_SEED';
const USER_INPUT_CLIENT_SEED = 'CLIENT_SEED';
const USER_INPUT_NONCE = 1;
const USER_INPUT_DIFFICULTY = 'easy' // "easy" | "medium" | "hard" | "expert";
const USER_INPUT_JUMP_COUNT = 21;
const fairValue = getFairValue({
 serverSeed: USER_INPUT_SERVER_SEED,
 clientSeed: USER_INPUT_CLIENT_SEED,
 nonceUsed: USER_INPUT_NONCE,
 round: 'chicken-cross',
});
const maxPossibleMultiplier = determineMultiplierWinPercentage(
 {
 fairValue,
 difficulty: USER_INPUT_DIFFICULTY,
 round: USER_INPUT_JUMP_COUNT,
 }
);
</pre>

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