Classic vs International Checkers: What Actually Changes Between the Two Rule Sets

Checkers on this site supports two different rule sets, and if you've only ever played one of them, switching to the other can feel like an entirely different game wearing the same board and pieces. Here's exactly what changes between Classic and International rules, and why the difference is bigger than just the board size.

Board size: 8x8 vs 10x10

Classic checkers (sometimes called English or American draughts) is played on the familiar 8x8 board, the same size as a chess board. International draughts uses a 10x10 board instead, which sounds like a small change but adds twenty extra playable squares and noticeably slows down how quickly the board opens up in the early game.

Regular pieces: forward only, or forward and backward

In Classic rules, an uncrowned piece can only ever move or capture diagonally forward, toward the opponent's side of the board. International rules relax this for captures specifically: an uncrowned piece can capture backward as well as forward, even though it still only moves forward on a normal, non-capturing turn. That single rule opens up far more tactical possibility, since a piece you thought was safely behind your front line can suddenly be exposed to a capture from behind.

Kings: one square at a time, or flying across the board

This is probably the biggest practical difference between the two rule sets. A Classic king, once crowned, still only moves one square at a time diagonally, just in either direction instead of only forward. An International king 'flies': it can move any number of empty squares along a diagonal in a single turn, the same way a bishop moves in chess. A single flying king on an open board is a genuinely dangerous piece in International rules in a way a Classic king never quite matches.

Captures: mandatory in both, but chains hit harder in International

Both rule sets on this site enforce mandatory captures: if a legal jump is available, you have to take it rather than choosing a quieter move instead. Where International rules go further is in how aggressively a single turn can chain together, since a piece (especially a flying king) can sweep through multiple captures in sequence far more often than the more restricted Classic ruleset tends to allow.

Why offer both instead of picking one

Most casual players outside competitive circles grew up with Classic rules, and it's the faster, more familiar version to jump into. International draughts is the format most associated with serious tournament play in much of Europe, and the bigger board with backward captures and flying kings genuinely rewards deeper, slower thinking. Rather than treat one as the 'default' and the other as a bonus mode, both sit side by side on the same start screen.

Which one should you actually play

If you want a shorter, snappier game that still rewards good positioning, start with Classic. If you want a longer, more tactical session where a single flying king can swing the whole board, switch to International. Neither is the 'easy mode', they're just different enough that most players end up with a genuine preference once they've tried both.

• Classic: 8x8 board, forward-only captures for regular pieces, kings move one square at a time.
• International: 10x10 board, regular pieces can capture backward, kings fly across open diagonals.
• Mandatory captures apply in both rule sets.

Can I switch rule sets in the middle of a game?

No, and this is intentional rather than a limitation. Since the two rule sets use different board sizes, switching mid-game would mean either resizing a half-finished board or fitting a 10x10 layout of pieces onto an 8x8 grid, neither of which makes sense. Choosing a rule set starts a fresh game, the same way you'd agree on a variant before sitting down at a physical board rather than partway through a match.

Neither rule set is more 'correct' than the other, they're just genuinely different games sharing the same pieces and the same diagonal logic. If you've only ever played one, the other is worth trying at least once before deciding which one you actually prefer.