This could use a bit more explanation. For instance:<p>How many points and how many bonus moves do you get for a capture? Does it depend on what you capture? (It looks like it's one bonus move whatever you capture, but more points for more valuable pieces; 1 for a pawn, 3 for a bishop, so I'll guess it's 5 for a rook and 9 for a queen.)<p>Does "Beware of attackers!" mean (1) you aren't allowed to move the knight to a square that's attached, (2) you will get some points deducted when you do, or (3) nothing, it's just flavour-text? (It looks like it's #2, a loss of one point each time you move to a square that's attacked.)<p>The instructions don't mention the "clean board" bonus; I think they should.<p>I'd write it something like this:<p><i>Complete each level by reaching the target within the given number of moves.</i><p><i>Each piece you capture gives you one more move, and points according to the value of the piece.</i><p><i>You lose one point any time you move to a square that's attacked.</i><p><i>Your score for the level is the number of moves you had spare at the end, times the number of points you earned. Double if you captured all the pieces!</i><p>(... Except that it looks as if there's some further "streak" mechanic, which I haven't tried to figure out the details of.)<p>If that's too long, put it behind a clicky-button, and just say "Get your knight to the target square. Earn points for getting there quickly without being attacked, and capturing pieces on the way." plus a button labelled something like "Full rules".<p>Maybe make the notification when you capture a piece say something like "+3 points / +1 move"?<p>If the levels get fairly crowded then it might be expensive to get the computer to find the <i>best possible</i> score, but it shouldn't be hard to make it find a <i>pretty good</i> score. You could present that, either at the start or after the user finishes the level, as a target, and congratulate them when they meet or even beat it.