dicepro: I'm not at all sure these rules will lead to a shorter game. Sure, there will be less squares, but my (short) experience so far with Knight Fight is that games end way before all squares have been visited. The game ends because one of the knights has no moves available, and it's the disappearance of the squares that causes it. But the dealing of numbers in "Knights of Fury" is clumsy and inelegant (because you're using decimal numbers and an 8x8 grid). As a result, over 25% of the numbers don't have mirrors. So, Knights of Fury starts with less numbers, but the numbers disappear slower.

Therefore, I suggest something else. Still use an 8x8 board. Use octal numbers (that is, only the digits 0-7 are used). Use the same rules as with Knight Fight when it comes to moving and disappearing of numbers. But don't count points. First person who cannot move his knight loses. And since going first is then a disadvantage, force black to start from a different coloured square than white.