Unirexal chess is a chess variant It is only one king on the board; the other player must mate within a certain number of moves or lose.
 
Included is a two queen variant of unirexal chess, played on a chessboard with almost the normal opening setup: only the black king is now replaced by a second black queen.
 
White and black should agree on a certain number of moves. When black mates white within that number of moves, he wins the game, otherwise he loses. One can use different mechanics to choose the number of moves. I have improved that 35 moves are a equal play and therefore this number is implemented.
 
Draws are impossible. That means the white player has lost, if he to move has no legal move and his king is not in check. Stalemate is a loss for white.
 
 
In the twenty knights variant of unirexal chess, black has twenty knights. Black must mate in 50 moves.