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    Home»Development»How to Checkmate in Chess

    How to Checkmate in Chess

    August 22, 2025

    Ready to turn your chess advantages into decisive victories? We’ve just released a new beginner-level course on the freeCodeCamp.org YouTube channel that focuses on the most important phase of the game: the endgame.

    This course is designed for players who already know the basics but want to deepen their strategic understanding. You’ll learn how to recognize and execute common checkmate patterns, a key skill for increasing your chances of winning.

    Ihechikara Abba teaches this course. He has an ELO rating of 2200, which places him in the top 1% of chess players worldwide.

    This course is divided into two main sections to build your skills:

    • Algebraic Chess Notation: First, you’ll master the standard method for recording and communicating chess moves. Understanding notation is essential for studying games and improving your play.

    • Endgame and Checkmate Patterns: The second section covers powerful endgame techniques. You’ll learn classic checkmates, including the two-rook endgame, queen and king patterns, Anastasia’s Mate, Smothered Mate, and more.

    Watch the full course now on the freeCodeCamp.org YouTube channel (1-hour watch).

    Source: freeCodeCamp Programming Tutorials: Python, JavaScript, Git & More 

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    Rest Assured – Schema to use cannot be null

    May 30, 2025

    I’m working with Java and REST Assured to test REST APIs. I was trying the example with JSON schema validation but it throws this error:
    java.lang.IllegalArgumentException: Schema to use cannot be null

    at io.restassured.module.jsv.JsonSchemaValidator.validateSchemaIsNotNull(JsonSchemaValidator.java:270)
    at io.restassured.module.jsv.JsonSchemaValidator.access$300(JsonSchemaValidator.java:75)
    at io.restassured.module.jsv.JsonSchemaValidator$JsonSchemaValidatorFactory.create(JsonSchemaValidator.java:281)
    at io.restassured.module.jsv.JsonSchemaValidator.matchesJsonSchema(JsonSchemaValidator.java:166)
    at io.restassured.module.jsv.JsonSchemaValidator.matchesJsonSchemaInClasspath(JsonSchemaValidator.java:117)
    at suites.SchemaFollowupTest.ContractFollowUpTestSuccess(SchemaFollowupTest.java:44)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    My test code is:
    given()
    .header(“Content-Type”, ContentType.JSON)
    //.header(“Authorization”, “Bearer ” + ConfigEnvironments.TOKEN_K8S)
    .body(jsonBody)
    .when()
    .post(ConfigEnvironments.BASE_URL_CLAIMENGINE +”/api/v1/FollowUp”)
    .then().log().all()
    .statusCode(202)
    .and()
    .body(matchesJsonSchemaInClasspath(“src/test/resource/followup-schema.json”));

    My strucuture folder is here:
    [1]: https://i.sstatic.net/K9m2UjGy.png

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