第一部分：纸牌游戏出千 · CARD MARKING METHODS

One-Way Decks

纸牌标记已报道技巧等级：Intermediate

工作原理

A one-way deck has backs that are not the same when a card is turned end for end. A picture, a border, or a logo that does not mirror gives the orientation away. Someone who turns chosen cards one way, and the rest the other way, can tell those cards from the back without adding a mark. This is not edge sorting, which uses a small printing difference already on a symmetrical design, and it is not a mark added with ink or a blade.

出现场合

Poker, blackjack, baccarat, and any game in which card backs stay in view

有据可查

Regulators treat a reversible back as a card-security requirement, not as a curiosity. The June 2022 Saskatchewan standard is a regulator’s own rule. This entry does not rest on a named criminal case.

识别与防范建议

付费部分

监控室如何识别one-way decks，以及如何防止其再次发生——为值班人员而写，而非为普通读者。

识别与防范是付费层。购买可下载版本即可解锁全部400种方法，或通过任何付费方案解锁。

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本文作为监控、合规及博彩营运专业人员的侦测参考发布。阈值与调校由各家娱乐场自行设定。本文不构成任何操作指引：描述该方法的目的仅在于使其能够被识别。