The 2K Rule — One Piece Card Game Attack Math, Explained

One card from hand counters at most 2,000 power — that single fact generates the most quoted piece of strategy in the entire One Piece Card Game community. An attack equal to the defender’s power forces one card. An attack 1,000 over still forces only one card, because a single 2k counter stops it. But an attack 2,000 over their power demands at least two cards, or a counter event.

The 2K Rule: attack 2,000 over the target’s power, and every defense costs your opponent two cards.

The 5 / 7 / 9 / 11 ladder

Against the standard 5,000-power leader, the magic numbers are 5, 7, 9 and 11 thousand:

Look at the 6,000 row. A 6,000 attack costs you one more DON!! than a 5,000 attack and drains exactly the same single card. Never swing 6,000 into a 5,000 leader. In general, even totals round up to odd against 5,000-power targets; against the rarer 6,000-power leaders the whole ladder shifts to 6 / 8 / 10.

It works on characters too

Attack a 6,000-power character with 8,000 and your opponent either loses the character or pays two cards to keep it — both outcomes are profit for you. That’s the 2K Rule turning into a win-win, and it’s why strong players size every single swing instead of just attaching whatever DON!! is left over.

Where it goes from here

Sizing is a third of the attack system. The other two thirds are sequencing (the order of your attacks changes how many cards they cost — small-to-large is right for three separate reasons) and splitting (how to divide total power across multiple attacks so every swing is unanswerable — one giant attack is the most common way players waste lethal). Both get full chapters in the guide, along with the complete kill-turn checklist that turns this math into closed games.