https://chessvariants.training/ is a website where you can improve your chess variant skills.
The solution file ChessVariantsTraining.sln can be opened with Visual Studio.
In the src/ChessVariantsTraining directory, you have to add a config-secret.json file:
{
"Email": {
"RequireEmailVerification": false,
"SmtpHost": "smtp.gmail.com",
"SmtpPort": 587,
"SmtpUsername": "",
"Password": "",
"SenderName": "",
"FromAddress": ""
},
"RecaptchaKey": ""
}