ReKtDeal

A Kotlin reimplementation of Antony Lee's Redeal,

which is a reimplementation of Thomas Andrews' Deal in Python.

Redeal is a deal generator: it outputs deals satisfying whatever conditions you specify - deals with a double void, deals with a strong 2♣️ opener opposite a yarborough, etc. Using Bo Haglund's double dummy solver, it can even solve the hands it has generated for you. Unfortunately, the language of Redeal - Python - is slow. ReKtDeal is thus my rewrite of Redeal using another language: Kotlin.¹

The deal generation in ReKtDeal is often 100x faster than Redeal, and that's before multi-threading.

DDS4J: Double Dummy Solver

Under the hood, ReKtDeal uses DDS4J - Java binding for Bo Haglund’s double dummy solver (JVM 22+ required). The binary is bundled for Windows/Linux x86_64, macOS x86_64/Apple Silicon. I believe this covers most users. See the instructions if your system is not included.

Setup

Fundamentally, ReKtDeal is just a Kotlin library. Using it is no different from any other library from Maven.

E.g. Gradle (Kotlin DSL)

dependencies {
    implementation("com.github.phisgr:rektdeal:0.3.0")
}

// Set the JVM args
application {
    applicationDefaultJvmArgs = listOf("--enable-native-access=ALL-UNNAMED")
}

But I imagine most uses are going to be interactive. For that Kotlin Jupyter can be used.

@file:DependsOn("com.github.phisgr:rektdeal:0.3.0")

About

The name is pronounced "wrecked deal" - a play on "Redeal" and "kt".

While ReKtDeal largely mirrors the API of Redeal, it departs in philosophy. Redeal, following Deal, is primarily a command-line program that accepts scripts - user logic is passed into a main program. For instance, you can construct an OpeningLeadSim in your code, but to run it you have to invoke python -mredeal.

ReKtDeal, on the other hand, is a library. In your own program or in the REPL, you call openingLead like any other function.

Talk is cheap. Show me the code.

See a full introduction demo here.

Footnotes

1. The opening paragraph was adapted from the README of Redeal. The almost identical wording was inspired by some then-recent news. ↩