Main Board Rules
- FIDE normal chess rules apply on the 8x8 main board.
- Non-capturing legal moves resolve immediately on the main board.
- A legal capturing move does not resolve immediately: it triggers a skirmish.
- The piece attempting the capture is the attacker. The target piece is the defender.
- Main-board objective remains checkmate, but a king can still be removed if that king becomes the stake in a skirmish and loses the duel.
Skirmish Trigger And Stakes
- Every legal capture attempt launches a 5x5 skirmish duel.
- The attacker piece and defender piece are the stake of that duel.
- Skirmish attacker maps to White in skirmish. Skirmish defender maps to Black.
- This role mapping is independent from main-board White/Black ownership.
- Skirmish uses odds based on the capture pair. Example: queen attacking pawn usually gives attacker stronger odds than defender.
Skirmish Engine Rules (5x5)
- Win condition: capture the opponent king.
- King captures king is a valid legal move in skirmish.
- No check or self-check enforcement: kings can move into danger, and moves that expose your own king are still legal.
- No en passant.
- No two-square pawn advance.
- Pawn promotion is automatic to queen on the back rank.
- Skirmish draw conditions: no legal moves for the side to move, threefold repetition, or hard 16-ply cap.
- Skirmish setup presets: classic, fortress, spearhead, wings, center clash, random.
- For the most fun and maximum chaos, use Random skirmish setup with low time on the skirmish clock.
- Fairness safeguard in Random: base setups are regenerated if White has an immediate king-capture threat on Black at move one.
- Important asymmetry: this safeguard protects Black from immediate move-one danger; White can still start in immediate danger in Random.
- Fixed setup presets can also start with immediate king-capture threats. Players are expected to notice and account for this when trying to capture in main board.
Example Game
Legal line from the initial position. Use buttons or keyboard arrows to replay, and flip the board when needed.
The replay intentionally does not show full skirmish battle move-by-move sequences, only skirmish outcomes (attacker win, defender win, draw) and their effect on the main game. See skirmish examples below. Full written rules are listed below.
skirmish examples
Three sample skirmish duels run in parallel. One ends in attacker win, one in defender win, and one in draw.
+
-
=
Skirmish Capture Resolution And Meaning
Main-board moves use normal chess notation (SAN), but captures are conditional in Skirmish Chess. So the same capture text can resolve to different board outcomes after the skirmish duel.
- Normal move example:
Nf3means the move resolves immediately, same as standard chess. - Capture attempt example:
Bxe5means bishop attempts to capture on e5, then skirmish decides the result. -
Skirmish outcomes:
- Attacker win: + means capture succeeds on main board (
Bxe5+) - Defender win: - means attacker piece is removed from main board (
Bxe5-) - Draw: = resolves into configured draw rule: both pieces removed, both pieces stay, or defender win (
Bxe5=)
- Attacker win:
special situations
Valid main-board outcomes in Skirmish Chess that would not occur in normal chess, because capture attempts can fail after the skirmish duel resolves.
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Clocks And Session Rules
- Main and skirmish clocks are separate and both configurable.
- Main and skirmish increments are supported.
- Skirmish has configurable start countdown. 0 means immediate start.
- Rule authority is server-side. Frontend hints are advisory only.
Rating (Elo) System
- Skirmish Chess uses a simple Elo-style rating update after each finished game.
- Winners gain rating and losers lose rating; draws produce smaller adjustments.
- The system is intentionally simple and is meant only to show relative strength between players.
- Use it as a quick comparison (who is likely stronger), not as an official or perfect skill measure.