Helpmates
Participants at the Winton British Solving Championship face six rounds of fiendishly difficult chess problems. The problems have an exam-style rubric, where marks are given for the right answer, but also for relevant variations to the main idea. Each round contains a different genre of problem: mate in two, mate in three, longer mates, helpmates, selfmates and studies (e.g. ‘White to play and win’). Helpmates can be particularly confusing for the uninitiated, because unlike vanilla chess where the play is adversarial, a helpmate is a display of choreography, where the sides cooperate to bring about mate as briskly as possible.