Opponent's intervention

4.1. Intervention after constructive openings or constructive overcall after Opps opening:
Template stepping bids, with some standard bids excluded form stepping: H, S, points, H-S, 5+H, 5+S, C, D, above - Smart Splinters after Pd major and XFER SPL at 3 level, Smart Michaels at 4 level after Pd minor.

Excluded from template stepping bids:
Bidded Opp suits;
1NT: 8-10HCP, NAT;
2NT: INV, FIT after Pd major and PRE/GF, FIT after Pd minor;
raise to 3 minor: INV, FIT;
3NT: to play;
raise to 2/3/4 major: PRE, if constructive raise is available;
2 in suit right below raise of Pd major: constructive raise;
3 in unbidded minor, which can't be bidded lower: INV, 6+m GOOD, NF;
3/4 in suit right below raise of Pd 1/2 major, if 2NT constructive raise is not available is constructive+ raise;
RDBL after Pd C(artifical): 0-5HCP, puppet for D, SO in side suit;
Pd minor - (Opp H) - C: INV+, 6+S;
After Opp 3S: Dbl points, above Smart Splinters after Pd H and Smart Michaels after Pd minor.

Note: With GF and length in Opps suit or minor, you can bid "points".
Note: Double and redouble are included in steps.

Exceptions:
After we found FIT - Smart Splinters. Reraise of fit is competitive, if INV is available. Doubles by limited with previous bid(pass/raise/reraise) hand are for penalty.

4.2. Intervention after PRE openings or PRE overcall after Opps opening:
DBL: Penalty
Other: Smart Splinters

4.3. Intervention after Pd response:
4.3.1. Response was not INV+:
DBL: Competitive, Take out for unbidded suits, denied FIT, can be GF if BAL/SEMIBAL
1NT: NAT
Rebid of Op suit: Competitive, 6+ GOOD suit, NF
raises: FIT, of major competitive, of minor consructive
2NT: INV+, FIT after Pd major and PRE/GF, FIT after Pd minor. Note if 2NT is not available, then use 3/4 in suit right below raise as constructive + raise.
Unbidded suit at 1-2 level: Cometitive, 6+ Op suit - 4+ in bidded suit, NF
3 in unbidded minor(include cue): GF, 6+ Op suit.
3 in unbided major(include cue): GF, 6+ Op suit - 4 in unbidded suit.
3NT: to play
Above: Smart Splinters

4.3.2. Response was INV+:
Pass: 0-1/4+ cards in opps suit
DBL: 2-3 cards in opps suit
other bids: like response was not INV+, will naot pas Pd penalty DBL.

4.4. Intervention after Pd Opening/Overcall/Response and at least one of below:
-Strong Opps bid (16+HCP);
-By Passed Pd;
-Bids by both Opps;
-Both Pd denied INV+ values

All bids are Smart Splinters - responses or rebids:

DBL/RDBL (if DBL/RDBL are not available - cheapest Cue or cheapest NT if Cue is not available): Own lead(suit) or unexpected strength (strong NT at least).

Raise/Jump(any) raise: Not offensive raise, normally denied SING/VOID

Side suit: Values(if choice) + FIT + Offensive hand, normally side SING
Jump(any) side suit/Cue: Values/No + Super FIT + Offensive hand, normally side SING

NT: FIT + Super Offensive hand, normally side VOID
Jump(any) NT: Super FIT + Super Offensive hand, normally side VOID

4.5. Intervention after Pd minor Opening/Overcall, bids at 4 level:

All responses are Smart Michaels (in unbidded suits):

4C: 4M-6+m (0445)
4D: 5+M-5+m
4M: 6+M, to play
4M cue: 6+M, 4-L
4NT: 5+-5+ minors (unbidded minor, even KC, if Opp minor)
5C/D: to play (5+-5+ majors, if cue in Opp minor)