K♦9♦ HJ vs CO, preflop, 100 bb

Best play: Fold

Why

First-in from HJ in 6‑max with K9 suited (K and 9 of diamonds): action is folded to hero, so the only live options are open-raise or fold; you cannot call a pot nobody has opened. K9s sits on the bottom edge of a tight HJ RFI range. Many solver charts do open it, so fold is a defensible conservative default but not the only line. If you open, it is a standard 2.2‑2.5bb raise that flops top-pair and nut-flush equity; if you fold, you simply duck a marginal spot with three players left to act behind. Treat fold here as the tight baseline, not a mandatory rule.

Key idea

When it is folded to you, your only choices are to open-raise or fold; calling does not exist as first-in. K9s from HJ is a borderline open, so folding is the safe tight default but opening is also correct.

Common mistake

Thinking of this spot as facing a raise and wanting to call. Nobody has opened, so call is impossible; the marginal K9s decision is purely open or fold.