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1NT overcall with a small singleton? Legal or Not in ACBL??

Today at our club duplicate, I sat North on this deal:

West
1098
Q102
J98643
9
North
Q3
J8765
AQ10
Q85
East
A7654
A
K72
10764
South
KJ2
K943
5
AKJ32
W
N
E
S
P
P
1
1NT
P
3
P
4
P
P
P
D
4 North
NS: 0 EW: 0

Our agreements are that 1NT overcalls are 15-18, ostensibly natural.

Over 1NT overcalls, we play:

      *  "systems OFF" (2 level advances other than a cue-bid are to play)

      * cue-bid (2-level) is "Staymanesque", invitational+.

         (Opener shows max by jumping, min with 2N or 3M)

      *  3M advances are GAME FORCING choice of games (3NT or 4M)

      *  3m advances are natural and invitational (but NF).

      *  2NT advance: invitational, may have a 5 card major

          (overcaller rebids 3OM with 3 or 4 if accepting).

      * Texas transfers available at the four level.

So, obviously, with my hand I bid 3, GF, choice of games, and partner had a pretty easy choice--4 (strangely, it turns out that 4 can be beaten on a lead, while 3NT is always makeable with good guessing).

Anyway, after A lead and a continuation, I duly made 4, losing 1 and 2 s.

East was incensed, claiming that a 1NT overcall with a small singleton is (ACBL) illegal.  The director agreed, but let the result stand on the basis of 1NT being a "psych".  We clearly do NOT have any agreement allowing 1NT overcall with a small singleton.  Maybe I've seen this partner do this (once) before, but I cannot clearly remember such an incident for sure. 

When I got home, I looked this up in on-line ACBL convention chart documents.  I found a clear definition for what a NATURAL 1NT opening or overcall is, to wit:

  " A NT opening bid or overcall that contains no voids, no more than one singleton, which must be an ace, king, or queen, and that does not contain 10 or more cards in two suits combined."

I also found a clear statement that it is "disallowed" to *OPEN* a NF 1NT that is NOT "NATURAL" under "Disallowed Bids" in the "Open" Convention chart: 

  "(DISALLOWED)  A non-Forcing 1NT opening that does not meet the definition of Natural"

However, I was UNABLE to find any similar statement pertaining to (NF) 1NT *Overcalls*.Yet are director claimed that the same restriction applies to 1NT overcalls.  Was the director right?  If you think he was, I'd appreciate a citation of where this is stated.

BTW, I think my partner's choice of 1NT was poor whether or not it was legal.  I prefer a 2 overcall instead.

 

(natural NF) 1NT overcall with a small singleton is LEGAL in ACBL open chart
(natural NF) 1NT overcall with a small singleton is ILLEGAL in ACBL open chart

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