Jamming Beam states: " Attack: If this attack hits, all hit/ critical hit results inflict jam tokens instead of damage."
So let's say the attacker rolls: hit / hit / crit and the defender rolls: evade / evade / blank.

¿How many JAM tokens does the defender receive?

a.- One, because only 1 crit was uncancelled.
b.- Three, because the attack hitted and there were three hit/crit results in the roll.

Thanks!

One.

An attack is determined to hit or miss based on results after hits/crits are cancelled by evade results. After the cancellation, there is one crit. The attack is determined to hit, and there is only one crit, so one jam token.

But it should say that "remaining" results inflict jam instead of damage, shouldn't it?

9 minutes ago, chopan said:

But it should say that "remaining" results inflict jam instead of damage, shouldn't it?

The only results you have left are those not cancelled, just like normally attacking & dealing damage.

5 minutes ago, chopan said:

But it should say that "remaining" results inflict jam instead of damage, shouldn't it?

It might be a little clearer if it said that, but here is the Neutralize Results step per the Rules Reference:

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4. Neutralize Results: During this step, pairs of attack and defense dice neutralize each other. Dice are neutralized in the following order:

a. Pairs of [evade] and [hit] results are canceled.

b. Pairs of [evade] and [crit] results are canceled.

The attack hits if at least one [hit] or [crit] result remains uncanceled; otherwise, the attack misses.

And canceled results are no longer relevant:

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When a die result is canceled, a player takes one die displaying the canceled result and physically removes the die from the common area. Players ignore all canceled results.

So only the uncancelled results can inflict jam tokens.

Very clear. Thank you very much.