This is a simple tool I made to practice counting territory in go.
For each position, count which side is winning, assuming no komi and no prisoners. All positions have the same number of black and white stones, and there are no sekis, so area scoring and territory scoring will give the same result.
The positions are manually generated, so there's a relatively small number of them (100 at the moment), which are presented at random orientations. To avoid tempting you to memorize specific positions, for many of them I've included a very similar position where the result is the opposite.
You have unlimited time to count the first board, then 30 seconds for the second board, 29 seconds for the third board, and so on down until a minimum of 10 seconds per board. The game continues until you run out of time or give an incorrect answer.
If you're playing from a computer, you might prefer using the left and right arrow keys instead of the black and white buttons on screen (you can also use enter to restart).
If you have any feedback, please let me know in this forum thread!