King-jack off-suit ?

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King-jack off-suit in hold ’em - By Mike Caro

It depends on the type of game.

Much of the modern literature ridicules the play of king-jack off-suit and similar hands that might be dominated. The truth is that in most games, these hands are very unprofitable from early positions and when calling an early position raise. Fine. Agreed.

And yet…

Still, king-jack ranks high on the list of hands you might be dealt at random and even average players in loose games frequently make money with it overall. I know that statement is shocking to most advocates of tight entrance requirements, but it’s the truth.

Why is king-jack a winner, when many books say that it will usually be dominated by ace-king, king-queen, ace-jack? It’s because real-life players are out there indiscriminately playing hands like king-7, jack-5, and who knows what else.
Dominates

The net effect is that king-jack often dominates more than it is dominated, and under command of a skillful player it definitely earns a profit. I’m not taking rakes into consideration by making this claim. But it’s definitely true that, in a seat-rental game, king-jack offsuit at a loose table has a long-range profit expectation in many situations, even though players are traditionally ridiculed for playing it. Use caution, though, because you’re likely to win less money when dominating than you lose when dominated.

I do agree that inexperienced players are safer not playing the hand because they’re likely to end up not knowing what to do after the flop. Beyond that, I believe the value of king-jack in loose games is widely underestimated.
Clarified

Let’s be clear about what I’m saying, though. I’m not recommending that you call with king-jack of mixed suits if an opponent raised the blind from an early position — meaning any of the first three seats following the big blind in a typical nine-handed game. In fact, you probably shouldn’t play even if that opponent just called.

Against a middle position or later opponent who was first to raise, you often can call profitably. Of course, the larger that raise in a no-limit game, the less inclined you should be to call. If nobody else has voluntarily entered the pot by the time the action reaches you, consider opening the action with a raise from middle positions — and almost always do so from the button position, the cutoff (one before the button), and even one seat further away than that.
Mitigated

You’ll find your fear of being dominated by larger kickers in these situations, while a real concern, is largely mitigated by the times loose opponents have weaker kickers than a king when you pair jacks and weaker kickers than a jack when you pair kings. So, despite the fact that novices should be cautioned against playing king-jack of mixed suits too adventurously, the reality is that the hand has a small advantage more often than most expert guidelines suggest. — MC