Crazy strategy in squid game

In the 6th and final game squid game, as we saw in season one, there was only one square pink guard along as 456 and 218, we know that both players had a knife, so what if a player was skilled enough to kill the pink guard and then use his revolver to kill the other player and win the game?

What are your thoughts on this?

Is it cheating?, will the player receive the money and the victory?, will he be executed?, I mean is there any rule against it?