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About this tool
Play a full multiplayer chess match locally with legal-move validation, timers, move history, captured pieces, draw offers and resign.
Chess Multiplayer is a full pass-and-play chess board for two people sharing one device, with a complete rules engine behind it: only legal moves are accepted, and castling, en passant, promotion, check and checkmate are all handled properly. It also recognises every standard draw — stalemate, insufficient material, the 50-move rule and threefold repetition — and runs a clock offering five choices on the New Match card, from 1-minute bullet up to 30-minute classical plus an Unlimited option. Move history is recorded in standard algebraic notation with correct disambiguation, alongside captured pieces and the running material count.
Open Chess Multiplayer on AltFTool — it loads instantly in your browser.
Pick a time control on the New Match card — Bullet (1 min), Blitz (5 min), Rapid (10 min), Classical (30 min) or Unlimited (no clock). Clicking one starts the match; there is no separate start button.
Take turns on the one device. Click a piece, or move the focus square with the arrow keys and press Enter, and its legal destinations are marked; click the destination to play it. The banner beside the board reads White to move or Black to move, switching to White is in check and Checkmate as the position demands, and a pawn reaching the last rank opens the Promote to dialog with queen, rook, bishop and knight.
Work the buttons under the move list: Offer Draw, which the other side answers with Accept or Decline; Resign, which asks Sure? before you confirm Yes, resign; Flip to turn the board around; and New Game to start over. The Moves panel records algebraic notation, with Captured by Black and Captured by White above it and a clock for each side flanking the board.
Every candidate move is played out and rejected if it leaves your own king attacked, so pins and check evasions are enforced, not approximated.
Stalemate, insufficient material including same-colour bishops, 100 half-moves without a pawn move or capture, and threefold repetition of the exact position.
Move history writes real SAN, adding file or rank disambiguation when two identical pieces can reach the same square, plus O-O and O-O-O for castling.
No, this is local pass-and-play: both players use the same device and take turns, with a flip-board button so each can see the position from their own side. There is no matchmaking or network opponent.
Five buttons on the New Match card: Bullet at 1 minute, Blitz at 5, Rapid at 10, Classical at 30, and Unlimited. None of them add increment — every timed choice is a straight countdown, and when a clock reaches zero the game ends on Time forfeit.
The half-move counter resets on any pawn move or capture and otherwise increments, and the game is declared drawn once it reaches 100 half-moves — that is 50 moves by each side. Threefold repetition is checked separately, by comparing full position keys that include side to move, castling rights and the en passant square.
Yes, both. A double pawn push sets the en passant target square for exactly one move, and a pawn reaching the last rank opens a promotion dialog where you choose queen, rook, bishop or knight, which is then written into the notation as =Q, =R, =B or =N.