If Fencer X allows Fencer Y to score without any attempt at defense, what is the correct outcome?

The situation described involves Fencer X allowing Fencer Y to score without making any attempt to defend. In the context of fencing, this behavior typically indicates a lack of effort to engage in the match, which is contrary to the spirit of the sport. Allowing an opponent to score without even attempting to defend can be interpreted as unsportsmanlike conduct or a lack of seriousness about the competition.

In such cases, the rules provide a mechanism to maintain the integrity and competitive nature of the match. Awarding a black card, which signifies a penalty for unsportsmanlike behavior, is appropriate because it sends a clear message about the expectations for active participation in the bout. This maintains the standard of competition and encourages fencers to engage fully in their matches.

The other choices suggest responses that may not accurately reflect the conduct outlined in the scenario. They involve disqualification, warnings, or no action, but those measures do not address the specific conduct of failing to defend, which is why the issuance of a black card is the correct outcome in this instance.