In stealing blinds, how does the opening range width differ among CO, BTN, and SB? Why?

CO has the narrowest opening range, about 25%-30%, because its post-flop positional advantage is relatively small; BTN is the widest, about 40%-50%, due to its best post-flop position; SB is in the middle, about 35%-45%, although its position is the worst, it only needs to confront the big blind and already has dead money. Range width is mainly affected by post-flop positional advantage and the cost of stealing.

How to adjust the stealing range based on the blind's defending tendency?

If the big blind defends frequently (e.g., calls or 3bets over 40%), tighten your stealing range, especially from SB, to avoid frequent counterattacks. Conversely, if the big blind folds too much (over 70%), you can significantly widen your range to exploit his excessive folding. Adjustments should consider stack depth and opponent type.

How does stack depth affect stealing strategy?

When effective stacks are deep (e.g., over 100BB), post-flop technical advantages are more significant, allowing for a wider stealing range as you can profit post-flop even if called. When stacks are shallow (e.g., under 30BB), tighten your range to avoid marginal situations when facing a shove, as the pot odds for stealing worsen and post-flop maneuverability is limited.

#BTN#Cutoff Steal#Position#Steal Blinds#Opening Range#Pre-Flop Strategy

Preflop Steal Strategy: Opening Range Width Selection for CO, BTN, SB

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This article explains the opening range width selection for preflop steals from the CO, BTN, and SB positions in No-Limit Texas Hold'em, analyzing the impact of positional advantage, blind defense tendencies, and stack depth.

Preflop Blind Steal Strategy: Opening Range Selection for CO, BTN, SB

Blind steal (Steal) refers to the action of a late-position player (CO, BTN, SB) raising preflop in an attempt to take down the blinds before the blind players have acted. The success rate of a steal depends on opponents' defending frequency, and the width of the opening range needs to be dynamically adjusted based on position, opponent tendencies, and stack depth.

Position and Range Width

Generally, the later the position, the wider the opening range, due to greater postflop position advantage.

CO (Cut Off) : CO is the first position that can attempt a steal. In a typical GTO (Game Theory Optimal) strategy, CO's opening range is approximately 25%-30% of all starting hands. This includes all pairs (22+), all A-high hands (A2s+, A9o+), most suited connectors (e.g., 54s+), and some offsuit connectors (e.g., T9o). CO's raise size is typically 2.5-3 big blinds (BB).
BTN (Button) : BTN has the best postflop position, so the opening range is the widest. A typical range is about 40%-50% of starting hands. In addition to CO's range, BTN can add more marginal hands, such as small suited connectors (32s+), weak A-high hands (A2o-A8o), and some offsuited gappers (e.g., Q9o, J8o). Raise size is usually 2-2.5 BB to reduce the cost of the steal.
SB (Small Blind) : Although SB has the worst position (acting first postflop), when stealing it only needs to confront the big blind alone. Since 0.5 BB of dead money is already invested, SB's steal range is typically wider than CO's but narrower than BTN's, around 35%-45%. A typical range includes all pairs, all A-high hands, most suited hands (e.g., K2s+, Q5s+), and some offsuited hands (e.g., K9o+, QTo+). Raise size is usually 2.5-3 BB to compensate for positional disadvantage.

Factors Influencing Range Width

Blind Defending Tendencies : If the big blind (BB) defends frequently (e.g., calls or 3-bets more than 40%), tighten the steal range, especially from SB. Conversely, if the BB folds too often (e.g., over 70%), the range can be significantly widened.
Stack Depth : With deeper effective stacks (e.g., over 100 BB), the range can be slightly widened as postflop skill advantage is more pronounced. With shallower stacks (e.g., under 30 BB), tighten the range to avoid marginal situations when facing an opponent's all-in.
Opponent Type : Against tight-passive players (high fold rate), the range can be greatly widened; against loose-aggressive players (frequent 3-bets), tighten the range and consider 4-betting or folding.

Example Ranges (100 BB Effective Stacks, No Special Player Reads)

CO : 22+, A2s+, A9o+, K9s+, KTo+, Q9s+, QTo+, J9s+, JTo, T8s+, 98s, 87s, 76s, 65s, 54s (approximately 28% of starting hands)
BTN : 22+, A2s+, A2o+, K2s+, K9o+, Q5s+, Q9o+, J7s+, J9o+, T7s+, T9o, 96s+, 86s+, 75s+, 65s, 54s, 43s, 32s (approximately 45% of starting hands)
SB : 22+, A2s+, A5o+, K2s+, K9o+, Q5s+, QTo+, J7s+, JTo, T7s+, T9o, 96s+, 86s+, 75s+, 65s, 54s (approximately 38% of starting hands)

Note: These are typical ranges; actual play requires adjustment based on opponents.

Summary

Blind stealing is an important source of profit, but it requires flexible adjustment based on position, opponents, and stack depth. The opening widths for CO, BTN, and SB are, in order: BTN the widest, SB second, and CO the narrowest. Mastering dynamic adjustment can effectively improve preflop win rate.

FAQ

: CO has the narrowest opening range, about 25%-30%, because its post-flop positional advantage is relatively small; BTN is the widest, about 40%-50%, due to its best post-flop position; SB is in the middle, about 35%-45%, although its position is the worst, it only needs to confront the big blind and already has dead money. Range width is mainly affected by post-flop positional advantage and the cost of stealing.