Small Blind Balanced Strategy: Attack and Defense Range Construction

Position Scenario Description

The small blind (SB) is one of the most disadvantageous positions at the table, always acting out of position postflop and needing to post half a big blind (0.5BB) just to see cards. Therefore, the core of the small blind strategy is: tighten your range, use raises to seize initiative, and avoid getting involved in multi-way pots.

Recommended Range (100BB Effective Stacks, No Ante)

Raising Range (Approximately 18%–22% of Hands)

• Strong hands: TT+, AQo+, AJs+, KQs
• Medium hands: KQo, ATs, KJs, QJs, JTs, and small pocket pairs 77–99 (can be mixed)
• Some suited connectors: T9s, 98s, 87s, 76s (about half frequency)

Calling Range (Very Narrow, Approximately 6%–8%)

• Includes only: some weak suited aces (A2s–A5s), some small pocket pairs (22–66), and very few suited connectors (e.g., 54s, 65s) – mainly to protect the big blind and avoid being exploited by frequent raises.
• Note: In modern strategy, the small blind rarely calls, because calling leads to postflop passivity; the standard approach is to raise or fold.

Folding Range

• All hands below the above standards, including most garbage hands (e.g., 72o, 83o).

Range Construction Logic

1. Raise instead of call: The small blind's calling range is narrow because after calling, the SPR on the flop is high and the positional disadvantage is significant. Raising narrows the opponent's range and reduces postflop difficulty.
2. Value and bluff balance: The raising range includes strong hands (value) and medium bluffs (suited connectors, Axs). Bluffing hands typically have drawing potential and can continue aggressing postflop.
3. Against highly aggressive opponents: If the button (BTN) or big blind (BB) raises frequently, tighten your raising range and increase folding frequency.

Adjustment Factors

• Stack depth: When stacks exceed 150BB, you can slightly increase the raising frequency of suited connectors; with short stacks (<40BB), adopt a push-or-fold strategy to avoid complex maneuvers.
• Opponent tendencies: Against tight-passive players, you can widen your raising range (to about 27%); against loose-aggressive players, tighten your raises and use more 4-bets or all-ins.
• Ante: When antes are in play, there is more dead money in the pot, so you can slightly widen your raising range (by about 2–3%), but keep the calling range extremely narrow.
• Button's calling range: If the button calls frequently, your small blind raising range should lean toward value hands and reduce bluffs.

GTO Reference

Although GTO solutions are not completely fixed, it is generally accepted that under no-ante 100BB conditions, the optimal small blind strategy is:

• Raise about 20% of hands, call about 7%, and fold the rest.
• The raise size is typically 3BB (total investment of 3.5BB including the blind); smaller raises (e.g., 2.5BB) are rarely used to avoid giving the big blind favorable pot odds.
• Postflop, the small blind should adopt a "high-frequency continuation bet" strategy (about 70%–80% frequency) to maintain aggression using range advantage.

Practical Applications

• Example scenario 1: BTN raises to 2.5BB, SB holds T9s.
  • Action: Typically 3-bet to about 9BB; the fold equity is decent, and even if called, there is good postflop playability.
• Example scenario 2: BTN raises, SB holds 77.
  • Action: Consider 3-betting (about 8–9BB), because 77 rarely hits strong hands on the flop, but as a bluff, there is a reasonable chance to take down the pot. If the opponent calls frequently, lean toward calling.
• Common mistake: Calling too often from the small blind (e.g., calling with AJo), leading to passive losses postflop. Correct approach: either raise or fold; only call in specific situations (e.g., when the big blind is very weak).