The skilled guy got 3 successes. Since a Strike and a Block are versus tests, the unskilled guy’s obstacle to completely negate the skilled guy’s Strike is 6 (the skilled guy’s 3 successes, doubled to 6). But remember that each success in a Block cancels out one success from a Strike. The unskilled guy got the equivalent of 1 success on his Block (half of 3, rounded down). In the end, the skilled guy achieves a Strike with 2 successes.
Sword guy has his successes doubled to 6, then has 3 knocked off by the block, so he beats the ob1 strike by 2?
As you can see, in this instance, the math is functionally the same. However, it doesn’t always work out that way. For instance, if the skilled guy got 3 successes and the unskilled guy got zero successes, the skilled guy would have a successful Strike of 3 successes, not 6 successes.
OK, now lets assume it’s sword vs. knife and Sword has advantage (+2ob to knife). Sword scripts Strike and knife scripts Block. They both roll 3 successes, what happens?
As I read it, sword gets +2 successes to make a total of 5, and has 3 knocked off by block, which beats the ob1 strike by 1?
Are we assuming that both opponents are skilled here? If so, here’s how I would handle it: The Sword guy gets 3 successes. The Knife guy as gets 3 successes, but his +2 Ob cancels out two of those successes; he is left with 1 effective success. The Knife guy’s 1 successes cancels out one of the Sword guy’s successes. In the end, the Sword guy successfully Strikes with a margin of success of 2.