Getting your game ready…
Play White against the teal computer pieces. Select a piece, then a marked destination. Check means your king is attacked; every legal reply must remove that threat. Checkmate wins, while a player with no legal move but no check is stalemated: a draw.
Rooks move straight, bishops diagonally, queens both, knights in jumping L shapes and kings one square. Pawns move forward, initially up to two squares, but capture diagonally. At the far end, choose Queen/Rook/Bishop/Knight. Cancel backs out before moving. Only knights jump over pieces.
Castling moves king and rook together if their history and clear path permit it; the king cannot castle out of, through or into check. Select the king’s two-square destination. En passant captures a neighbouring pawn immediately after its two-square advance, when legal. Undo turn removes your last move and its computer reply; hidden games require Resume.
Check both sides’ checks, captures and threats before moving. A defended piece can still be a bad trade if you lose a queen for a pawn. Your attack must survive the opponent’s next choice.
Develop knights and bishops toward open space while protecting the king. Repeatedly moving one piece leaves others waiting. Compare a tempting capture with a move that gives several pieces useful safe squares.
Draws are automatic when the same legal position and turn repeat three times, or after 100 individual turns without a pawn move or capture. Material draws cover bare kings, one bishop or knight total, or only bishops sharing one square colour. No clocks or points; New game resets, and positions are not saved.