http://wiki.soxprospects.com/MLB+Compensatory+Draft+Pick+System
Compensation for Failure to Sign High Draft Picks
Teams that fail to sign a first or second round pick will be compensated by
receiving a virtually identical pick (plus one) in the following year's draft
(ex., a team that fails to sign the No. 5 pick in 2006 receives the No. 6
pick in 2007). A team that fails to sign a second round pick gets virtually
the identical pick the following season regardless of the round (for example,
if Boston fails to sign pick #62, it will receive pick #62A (~63) in the next
year's draft, regardless of whether pick #62A falls in the supplemental
round, the second round, or the third round). A team that fails to sign a
third-round pick receives a sandwich pick between the third and fourth
rounds. None of these picks may be forfeited. Additionally, these
compensation picks cannot be parlayed into compensation picks in a later
draft. If a player selected as compensation for failure to sign a previous
year's draftee also goes unsigned, the team does not have a right to
compensation for the unsigned player.
1. 若是球队未能签下第一及第二轮中第 n 顺位球员，将在隔年补偿 n+1 顺位
此 n+1 顺位与第几轮无关，即便该顺位是该年度的第三轮
2. 若是球队未能签下第三轮的球员，将在隔年补偿介于三四轮间的三明治选秀权
3. 这些选秀权不会被收回
4. 若是补偿选秀权依旧没有签下，将不再补偿